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1. Spatial distribution and regional difference of carbon emissions efficiency of industrial energy in China

Author

Fang Liu, Lu Tang, Kaicheng Liao, Lijuan Ruan, and Pingsheng Liu

Subjects
Medicine, Science
Abstract

Abstract The three-stage super-efficiency slack-based measure and data envelopment analysis (SBM-DEA) model with undesirable outputs is used to calculate carbon emissions efficiency of industrial energy (CEEIE) of 30 provinces in China from 2000 to 2017. Then ArcGIS software is used to illustrate the spatial distribution of CEEIE, and Dagum Gini ratio is calculated to decompose the regional difference. The results show that the spatial distribution of CEEIE changes from disorder to order and provinces characterized with high or low CEEIE cluster in space over time. The total Dagum Gini coefficient indicates that the interprovincial difference in CEEIE across China is gradually expanding, which is mainly induced by the difference between regions. Our findings attach more importance to interregional integration policies for carbon emissions reduction in China.

Published
2021
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2. Dilepton Program with Time-of-Flight Detector at the STAR Experiment

Author

Xin Dong, Lijuan Ruan, Ming Shao, Yongjie Sun, Zebo Tang, Zhangbu Xu, Wangmei Zha, and Yifei Zhang

Subjects
quark gluon plasma, heavy ion collision, dilepton, chiral symmetry restoration, thermal radiation, strong magnetic field, Mathematics, QA1-939
Abstract

Pairs of lepton and antilepton (dilepton) in a continuous mass range are one of the most experimentally challenging and golden probes of the quark-gluon plasma (QGP) produced in heavy ion collisions because they do not strongly interact with the hot and dense medium, and reflect the properties of the medium at the time the dilepton is generated. The measurements of dileptons require lepton identification with high purity and high efficiency at large detector acceptance. STAR is one of two large experiments at the relativistic heavy ion collider with a primary goal of searching for the QGP and studying its properties. The STAR experiment launched a comprehensive dielectron (e+e−) program enabled by the time-of-flight (TOF) detector that had been fully installed in 2010. In this article, we review the decade-long R&D, the construction and performance of the STAR TOF detector, and dielectron measurements, including thermal dielectron production and dielectron production from the Breit–Wheeler process. Future perspectives are also discussed.

Published
2023
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3. The coupling coordination development between green finance and environmental governance in China: Measurement and spatial-temporal analysis

Author

Geng Peng, Tiantian Wang, Lijuan Ruan, and Kaiyou Tian

Abstract

To direct financial resources for achieving the goal of environmental governance, the Chinese government has devoted increasing efforts to developing green finance. However, few studies explored the relationship between green finance and environmental governance. Thus, this paper first theoretically discusses the interactive connection between green finance and environmental governance. Then we construct two comprehensive indicator systems and use entropy method to calculate green finance index (GFI) and environmental governance index (EGI) for 30 provinces of China from 2004 to 2020. Using the data of GFI and EGI, the coupling coordination degree of green finance and environmental governance (CCDGE) is measured by coupling coordination model. The findings of spatial-temporal analysis show that GFI has grown more rapidly than EGI, but the development of green finance still lags behind environmental governance because of its short history. Although CCDGE is increasing steadily, it has been hovering in the moderate coupling coordination stage for a long time, and still has a great distance to the high coupling coordination level. The relationship between green finance and environmental governance are still in a state of disorderly development that restricts each other. Additionally, there are obvious regional differences in GFI and EGI and the interactive effect between green finance and environmental governance. Specifically, GFI and EGI in eastern China are highest, while CCDGE presents with a ladder decline status of ‘eastern region > central region > northeast region > west region’.

Published
2022

4. Energy Dependence of the Breit-Wheeler process in Heavy-Ion Collisions and its Application to Nuclear Charge Radius Measurements

Author

Xiaofeng Wang, James Daniel Brandenburg, Lijuan Ruan, Fenglan Shao, Zhangbu Xu, Chi Yang, and Wangmei Zha

Subjects
Nuclear Theory (nucl-th), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The collision energy dependence of the cross section and the transverse momentum distribution of dielectrons from the Breit-Wheeler process in heavy-ion collisions are computed in the lowest-order QED and found to be sensitive to the nuclear charge distribution and the infrared-divergence of the ultra-Lorentz boosted Coulomb field. Within a given experimental kinematic acceptance, the cross section is found to increase while the pair transverse momentum ($\sqrt{\langle p_{T}^{2} \rangle}$) decreases with increasing beam energy. We demonstrate that the transverse-momentum component of Weizsacker-Williams photons is due to the finite extent of the charge source and electric field component in the longitudinal direction. We further clarify the connection between the nuclear charge distribution and the kinematics of produced $e^+e^-$ from the Breit-Wheeler process, and propose a criterion for the validity of the Breit-Wheeler process in relativistic heavy-ion collisions. Following this approach we demonstrate that the experimental measurements of the Breit-Wheeler process in ultra-relativistic heavy-ion collisions can be used to quantitatively constrain the nuclear charge radius. The extracted parameters show sensitivity to the impact parameter dependence, and can be used to study the initial-state and final-state effects in hadronic interactions., 3 figures

Published
2022

5. Spatial–temporal evolution and regional difference decomposition of urban environmental governance efficiency in China

Author

Kaiyou Tian, Xiaodan Zhang, Lijuan Ruan, Geng Peng, and Fang Liu

Subjects
Sustainable development, Economics and Econometrics, Government, Geography, Planning and Development, 0211 other engineering and technologies, 02 engineering and technology, 010501 environmental sciences, Management, Monitoring, Policy and Law, 01 natural sciences, Geography, Environmental governance, Regional science, Decomposition (computer science), 021108 energy, Spatial dependence, China, 0105 earth and related environmental sciences
Abstract

The three-stage DEA method and super-SBM are combined to measure the urban environmental governance efficiency of 30 provinces in China from 2004 to 2016. Then, ArcGIS software is used to illustrate the spatial–temporal evolution of urban environmental governance efficiency, and DagumGiniratio is calculated to show the regional difference. The results indicate that the provinces characterized by high or low environmental governance efficiency are shown to cluster in space over time, and the spatial dependence of the environmental governance behavior of government is the greatest source of the regional difference of urban environmental governance efficiency. Our findings imply that the environmental governance behavior of government is spatial dependent, which highlights that the policies for improve environmental governance efficiency should be made globally.

Published
2020

6. Spatial Distribution and Regional Difference of Carbon Emissions Efficiency of Industrial Energy in China

Author

Kaicheng Liao, Fang Liu, Pingsheng Liu, Lu Tang, and Lijuan Ruan

Subjects
Multidisciplinary, Gini coefficient, Science, Spatial distribution, Article, Environmental sciences, Environmental social sciences, Greenhouse gas, Econometrics, Data envelopment analysis, Cluster (physics), Environmental science, Medicine, China, Energy (signal processing)
Abstract

The three-stage super-efficiency slack-based measure and data envelopment analysis (SBM-DEA) model with undesirable outputs is used to calculate carbon emissions efficiency of industrial energy (CEEIE) of 30 provinces in China from 2000 to 2017. Then ArcGIS software is used to illustrate the spatial distribution of CEEIE, and Dagum Gini ratio is calculated to decompose the regional difference. The results show that the spatial distribution of CEEIE changes from disorder to order and provinces characterized with high or low CEEIE cluster in space over time. The total Dagum Gini coefficient indicates that the interprovincial difference in CEEIE across China is gradually expanding, which is mainly induced by the difference between regions. Our findings attach more importance to interregional integration policies for carbon emissions reduction in China.

Published
2021

7. Exploring the double-slit interference with linearly polarized photons

Author

Lijuan Ruan, Zebo Tang, J. D. Brandenburg, and Wangmei Zha

Subjects
Physics, Photon, Meson, 010308 nuclear & particles physics, Linear polarization, Nuclear Theory, FOS: Physical sciences, Position and momentum space, Interference (wave propagation), Polarization (waves), 01 natural sciences, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Double-slit experiment, High Energy Physics::Experiment, Vector meson, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

The linearly polarized quasireal photons from the highly Lorentz-contracted Coulomb fields of relativistic heavy ions can fluctuate to quark-antiquark pairs, scatter off a target nucleus, and emerge as vector mesons. In the process, the two colliding nuclei can serve as slits, forming a Young’s double-slit experiment. In addition to the well-known double-slit interference pattern in position space, a similar interference pattern may be expected in polarization space due to the linear polarization of the colliding photons. In this paper, we investigate the interference effect in polarization space as revealed by the asymmetries of the decay angular distribution for vector meson photoprodution in heavy-ion collisions. We find a periodic oscillation pattern with transverse momentum, which can reasonably explain the second-order modulation in azimuth for the ρ0 decay observed by the STAR Collaboration.

Published
2021

8. Double-slit experiment at Fermi scale: Coherent photoproduction in heavy-ion collisions

Author

Shuai Yang, Lijuan Ruan, Wangmei Zha, Zebo Tang, and Zhongbin Xu

Subjects
Physics, Photon, Meson, 010308 nuclear & particles physics, Strong interaction, FOS: Physical sciences, Virtual particle, Electron, 01 natural sciences, Nuclear physics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Atom, Double-slit experiment, 010306 general physics, Nuclear Experiment, Quantum
Abstract

The double-slit experiment has become a classic thought experiment for its clarity in expressing the central puzzle of quantum mechanics—wave-particle complementarity. Such wave-particle duality continues to be challenged and investigated in a broad range of entities with electrons, neutrons, helium atoms, C60 fullerenes, Bose-Einstein condensates, and biological molecules. In this Rapid Communication, we present a double-slit scenario at Fermi scale with new entities—coherent photon products in heavy-ion collisions. Virtual photons from the electromagnetic fields of relativistic heavy ions can fluctuate to quark-antiquark pairs, scatter off a target nucleus, and emerge as vector mesons. The two colliding nuclei can take turns to act as targets, forming a double-slit interference pattern. Furthermore, the “which-way” information can be partially solved using sufficiently-high multiplicity heavy-ion collisions so that the reaction plane can be determined, which demonstrates the complementary principle, a key concept of quantum mechanics.

Published
2019

9. Photoproduction of J/ψ in non-single-diffractive p+p collisions *

Author

Ze-Hua Cao, Shuai Yang, Wangmei Zha, Lijuan Ruan, Chi Yang, Zebo Tang, and Zhongbin Xu

Subjects
Physics, High Energy Physics - Phenomenology, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, High Energy Physics::Experiment, Astronomy and Astrophysics, Rapidity, Nuclear Experiment, Instrumentation, Nuclear theory
Abstract

Significant enhancements of production at very low transverse momenta were recently observed by the ALICE and STAR collaborations in peripheral hadronic A+A collisions. The anomalous excess points to coherent photon-nucleus interactions in violent hadronic heavy-ion collisions, which were conventionally studied only in ultra-peripheral collisions. Assuming that the coherent photoproduction is the underlying mechanism responsible for the excess observed in peripheral A+A collisions, its contribution in p+p collisions with nuclear overlap, i.e. non-single-diffractive collisions, is of particular interest. In this paper, we perform a calculation of exclusive photoproduction in non-single-diffractive p+p collisions at the RHIC and LHC energies based on the pQCD motivated parametrization using the world-wide experimental data, which could be further employed to improve the precision of the phenomenological calculations for photoproduction in A+A collisions. The differential rapidity and transverse momentum distributions of from photoproduction are presented. In comparison with the production from hadronic interactions, we find that the contribution of photoproduction is negligible.

Published
2019

10. Systematic study of the experimental measurements onJ/ψcross sections and kinematic distributions inp+pcollisions at different energies

Author

Zebo Tang, B. Huang, Shuai Yang, Zhongbin Xu, R. Ma, Qian Yang, Chi Yang, Wangmei Zha, and Lijuan Ruan

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Kinematics, 01 natural sciences, Nuclear physics, Cross section (physics), Distribution (mathematics), 0103 physical sciences, Transverse momentum, Rapidity, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

The world experimental data on cross section and kinematic distribution in p + p and p + A collisions at √s = 6.8 – 7000 GeV are systematically examined in this work. The √s dependence of the inclusive cross section, rapidity, and transverse momentum distributions are studied phenomenologically. Also, we explore empirical formulas to obtain the total cross section, rapidity, and transverse momentum (pT) distribution. This is crucial for the interpretation of A + A J/ψ results at the BNL Relativistic Heavy Ion Collider when the p + p reference data are not available. In addition, the cross section at midrapidity and transverse momentum distributions in p + p collisions at √s = 39 and 62.4 GeV are evaluated.

Published
2016

11. Di-lepton production in p+p collisions at from STAR

Author

Lijuan Ruan

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Star (graph theory), Nuclear physics, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Relativistic Heavy Ion Collider, Flavor, Lepton
Abstract

The di-electron analysis for 200 GeV p+p collisions is presented in this article. The cocktail simulations of di-eletrons from light flavor meson decays and heavy flavor decays are reported and compared with the data. The perspectives for di-lepton measurements in Au+Au collisions are discussed.

Published
2011

12. Relativistic Heavy-Ion Collider (RHIC) physics overview

Author

Lijuan Ruan

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, Screening effect, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Detector, Constituent quark, law.invention, law, Quark–gluon plasma, High Energy Physics::Experiment, Statistical physics, Nuclear Experiment, Collider, Jet quenching, Scaling
Abstract

The results from data taken during the last several years at the Relativistic Heavy-Ion Collider (RHIC) will be reviewed in the paper. Several selected topics that further our understanding of constituent quark scaling, jet quenching and color screening effect of heavy quarkonia in the hot dense medium will be presented. Detector upgrades will further probe the properties of Quark Gluon Plasma. Future measurements with upgraded detectors will be presented. The discovery perspectives from future measurements will also be discussed.

Published
2010

13. Improving the calibration of the STAR TPC for the high- hadron identification

Author

Gene Van Buren, H. Bichsel, Olga Barannikova, Y. Fisyak, Pawan Kumar Netrakanti, Maria Cristina Suarez, X. Dong, Bedangadas Mohanty, Zebo Tang, A. Kocoloski, P. Fachini, Yichun Xu, Zhongbin Xu, and Lijuan Ruan

Subjects
Nuclear physics, Momentum, Physics, Nuclear and High Energy Physics, Time projection chamber, Pion, Hadron, Electron, Nuclear Experiment, Instrumentation, Charged particle, Particle identification, Spectral line
Abstract

We derive a method to improve particle identification (PID) at high transverse momentum ( p T ) using the relativistic rise of the ionization energy loss ( dE / dx ) when charged particles traverse the Time Projection Chamber (TPC) at STAR. Electrons triggered and identified by the Barrel Electro-Magnetic Calorimeter (BEMC), pure protons (anti-protons) and pions from Λ ( Λ ¯ ), and K S 0 decays are used to obtain the dE / dx value and its width at given β γ = p / m . We found that the deviation of the dE / dx from the Bichsel function can be up to 0.4 σ ( ∼ 3 % ) in p + p collisions at s NN = 200 GeV taken and subsequently calibrated in year 2005. The deviation is approximately a function of β γ independent of particle species and can be described with the function f ( x ) = A + B / ( C + x 2 ) . The deviations obtained with this method are used in the data sample from p + p collision for physics analysis of identified hadron spectra and their correlations up to transverse momentum of 15 GeV/c. The ratio of e − / e + (dominantly from γ -conversion) is also used to correct for the residual momentum distortion in the STAR TPC.

Published
2010

14. New prototype multi-gap resistive plate chambers with long strips

Author

Yongjie Sun, Ming Shao, E. J. Ramberg, Y. Wang, R. D. Majka, Bernd Surrow, B. Gui, D. G. Underwood, Michael Kohl, Lijuan Ruan, Xuewu Wang, P. Fachini, Nikolai Smirnov, C. Li, Frank Simon, G.J. Lin, Yan-E. Zhao, T. Nussbaun, H. F. Chen, T. Sakuma, Zebo Tang, Zhongbin Xu, W. J. Llope, Jie Liu, and G. Eppley

Subjects
Physics, Nuclear and High Energy Physics, Resistive touchscreen, Physics - Instrumentation and Detectors, business.industry, Detector, FOS: Physical sciences, Cosmic ray, Instrumentation and Detectors (physics.ins-det), STRIPS, law.invention, Telescope, Nuclear physics, Optics, law, Fermilab, Relativistic Heavy Ion Collider, business, Instrumentation, Beam (structure)
Abstract

A new kind of Multi-gap Resistive Plate Chamber (MRPC) has been built for the large-area Muon Telescope Detector (MTD) for the STAR experiment at RHIC. These long read-out strip MRPCs (LMRPCs) have an active area of 87.0 x 17.0 cm2 and ten 250 um-thick gas gaps arranged as a double stack. Each read-out strip is 2.5 cm wide and 90 cm long. The signals are read-out at both ends of each strip. Cosmic ray tests indicate a time resolution of ~70 ps and a detection efficiency of greater than 95%. Beam tests performed at T963 at Fermilab indicate a time resolution of 60-70 ps and a spatial resolution of ~1 cm along the strip direction., 9 pages, 13 figures, submitted to Nucl. Instr. and Meth. A

Published
2008

15. Physics with identified particles at STAR

Author

Lijuan Ruan and the STAR Collaboration

Subjects
Quark, Coalescence (physics), Physics, Nuclear and High Energy Physics, Energy loss, Physics beyond the Standard Model, Hadron, FOS: Physical sciences, Conical surface, Gluon, Azimuth, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

New physics results with identified particles at STAR are presented. Measurements at low $p_T$ address bulk properties of the collision, while those at high $p_T$ address jet energy loss in the bulk matter produced. Between these extremes, measurements at intermediate $p_T$ address the interplay between jets and the bulk. We highlight: measurements of $v_2$ fluctuations as a new, sensitive probe of the initial conditions and the equation of state; correlations involving multi-strange particles, along with ratios of identified particles to test coalescence as a mechanism of particle production at intermediate $p_T$; three particle azimuthal correlation to search for conical emission; and the energy and particle-type dependence of hadron production at high $p_T$ to study quark and gluon jet energy loss., Comment: 9 pages, 7 figures. To appear in the proceedings of the 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter 2006), Shanghai, China, November 14-20, 2006

Published
2007

16. Onset of radial flow inp+pcollisions

Author

W.M. Liu, Zebo Tang, Cheng Li, Y. C. Zhu, Zhongbin Xu, Hongfang Chen, Lijuan Ruan, and K. Jiang

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Flow velocity, Hadron, Elliptic flow, Multiplicity (chemistry), Nuclear Experiment, Relativistic Heavy Ion Collider, Scaling, Spectral line
Abstract

It has been debated for decades whether hadrons emerging from p+p collisions exhibit collective expansion. The signal of the collective motion in p+p collisions is not as clear as in heavy-ion collisions because of the low multiplicity and large fluctuation in p+p collisions. Tsallis Blast-Wave (TBW) model is a thermodynamic approach, introduced to handle the overwhelming correlation and fluctuation in the hadronic processes. We have systematically studied the identified particle spectra in p+p collisions from RHIC to LHC using TBW and found no appreciable radial flow in p+p collisions below √s = 900 GeV. At LHC higher energy of 7 TeV in p+p collisions, the radial flow velocity achieves an average of (β) = 0.320 ± 0.005. This flow velocity is comparable to that in peripheral (40-60%) Au+Au collisions at RHIC. In addition, breaking of the identified particle spectra mT scaling was also observed at LHC from a model independent test.

Published
2015

17. Measurement of Δ++ resonance production in d+Au collisions at √sNN = 200 GeV

Author

Dipak Mishra, Patricia Fachini, An Tai, Haibin Zhang, Lijuan Ruan, and Zhongbin Xu

Subjects
Physics, History, Particle physics, Time projection chamber, Star (game theory), Transverse momentum, Invariant mass, Production (computer science), Nuclear Experiment, Spectral line, Computer Science Applications, Education
Abstract

The measurements of the transverse momentum spectra and the invariant mass distributions of $\Delta(1232)$ $\to \pi p$, $K^{*}(892)\to \pi K$ resonances in $d$+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV using the STAR Time Projection Chamber (TPC) at RHIC are presented. The in-medium modification of the $\Delta$ and $K^{*}$ mass and width has been studied as a function of transverse momentum ($p_T$). The particle ratios $K^{*}/K$, $\Delta/p$ and the average transverse momentum ($ $) as a function of different collision centrality has been reported. The nuclear modification factors ($R_{CP}$ and $R_{dAu}$) of $\Delta$ and $K^{*}$ are discussed.

Published
2006

18. π, K, p and production from Au+Au collisions at 62.4 GeV

Author

Lijuan Ruan and the STAR Collaboration

Subjects
Nuclear physics, Baryon, Physics, Nuclear and High Energy Physics, Particle physics, Time projection chamber, Meson, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Modification factor, Nuclear Experiment, Particle identification, Spectral line
Abstract

The preliminary results of π±, K±, p and spectra are reported from Au+Au collisions at GeV. Particle identification is from the time projection chamber and time-of-flight system at STAR. The nuclear modification factor RCP for mesons (π±, K±) and baryons will also be discussed.

Published
2005

19. ϕ meson production in Au+Au and p+p collisions at sNN=200GeV

Author

W. Christie, A. H. Tang, A. I. Kulikov, Guy Paic, A. Chikanian, S. S. Shimanskii, W. M. Zhang, E. Sugarbaker, G. Rakness, Andrey Vasiliev, M. Shao, D. K. Mishra, A. Boucham, R. N. Singaraju, A. P. Meschanin, Janet Elizabeth Seger, F. Meissner, E. G. Judd, D. Arkhipkin, E. Yamamoto, S. Bekele, M. Heinz, Lee Stuart Barnby, Manish Sharma, J. Balewski, D. A. Morozov, Marie Germain, Rashmi Raniwala, Claude Andre Pruneau, A. Ishihara, Michal Sumbera, G. Renault, C. Suire, T. Ullrich, A. S. Hirsch, R. Wells, S. V. Razin, M. R. Dutta Majumdar, A. Lebedev, L. Gaudichet, J. Kiryluk, A. Ridiger, V. Faine, A. N. Zubarev, N. Schmitz, Thorsten Sven Kollegger, E. Shahaliev, H. Jiang, M. M. de Moura, J. C. Webb, P. Kravtsov, C. Adler, R. Zoulkarneev, J. Castillo, S. W. Wissink, Z. Xu, A. Stolpovsky, S. Heppelmann, D. Flierl, W. A. Love, Sergey Voloshin, M. Botje, Jay Roberts, B. E. Bonner, Adam Ryszard Kisiel, Vladimir Petrov, C-Q. Li, Basanta Kumar Nandi, K. J. Foley, B. D. Anderson, L. Martin, P. Seyboth, Jeffrey G. Reid, S. Kabana, I. Sakrejda, J. Sowinski, M. Vznuzdaev, Anik Gupta, R. V. Cadman, R. S. Longacre, L. Kotchenda, D. D. Koetke, P. Fachini, R. P. Scharenberg, O. D. Tsai, C. L. Kunz, J. E. Draper, Jianhong Wu, Hao-Ze Chen, C. J. McClain, M. Calderon De La Barca Sanchez, H. S. Matis, H. J. Crawford, C. F. Moore, S. P. Chernenko, Z. P. Zhaomin, M. L. Miller, Frank Jm Geurts, J. P. Coffin, W. J. Llope, Q. J. Liu, J. Baudot, Debasish Das, Raghunath Sahoo, M. Guedon, A. M. VanderMolen, C. A. Whitten, J. H. Thomas, J. E. Gonzalez, Bedangadas Mohanty, O. V. Rogachevski, Marcelo Gameiro Munhoz, D. J. Prindle, R. L. Ray, E. Potrebenikova, P. Szarwas, G. Igo, Vitaly Okorokov, M. J. Mora-Corral, W. W. Jacobs, J. Lauret, G. Eppley, D. Reichhold, Y. V. Zanevski, Xu Cai, C. Roy, J. Zoulkarneeva, Julien Faivre, A. K. Dubey, A. I. Pavlinov, S. Mahajan, B. Yuting, W. T. Waggoner, F. Liu, M. B. Tonjes, Q. Li, A. V. Brandin, Souvik Das, Pawan Kumar Netrakanti, R. Witt, R. Fatemi, S. Lange, L. Molnar, V. Morozov, J. Pluta, Peter Martin Jacobs, S. R. Klein, S. J. Lindenbaum, A. Klyachko, H. Zhang, V. Yu Khodyrev, T. Ljubicic, K. Schweda, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, O. Barannikova, D. L. Olson, S. E. Vigdor, C. A. Gagliardi, H. Caines, Sudhir Raniwala, N.D. Gagunashvili, N. Xu, M. Lopez-Noriega, H. Ward, P. Filip, T. D. Gutierrez, K. Krueger, B. K. Srivastava, I. M. Vasilevski, Christian Claude Kuhn, A. Rose, R. E. Tribble, Madan M. Aggarwal, Yaguo Wang, D. Hardtke, Fuqiang Wang, R. D. Majka, Sevil Salur, P. Chaloupka, B. Lasiuk, M. A. C. Lamont, Sukalyan Chattopadhyay, D. P. Mahapatra, J. Gans, Z. P. Zizong, S. Bhardwaj, B. Surrow, T. Dietel, A. A. Derevschikov, G. D. Westfall, S. B. Nurushev, Z. Milosevich, Mirko Planinic, M. S. Ganti, Boris Hippolyte, Z. M. Wang, M. Oldenburg, Gerald W Hoffmann, M. A. Lisa, S. Margetis, J. Schambach, Yu Chen, C. Perkins, Malgorzata Anna Janik, P. Sorensen, H. Long, W. J. Dong, C. Mironov, R. Picha, Joseph Adams, Y. Fisyak, T. Peitzmann, V. Perevoztchikov, K. Filimonov, E. W. Hughes, J. C. Dunlop, Ian Johnson, G. Van Buren, X. L. Wang, Y. Panebratsev, G. S. Averichev, D. Grosnick, G. Rai, V. I. Yurevich, T. W. Henry, V. V. Belaga, Zubayer Ahammed, M. J. LeVine, Sergey Panitkin, B. I. Bezverkhny, D. Magestro, O. A. Grachov, X. Dong, Sergey Timoshenko, M. Cherney, Z. Z. Xu, J. W. Harris, Frank Simon, A. Bravar, G. Wang, S. K. Badyal, T. D. S. Stanislaus, S. K. Pal, T. W. Ludlam, Peter Graham Jones, R. Lednický, V. A. Nikitin, J. M. Nelson, F. Retiere, Thomas Michael Cormier, G. Skoro, C. Struck, J. Takahashi, J. Putschke, N. G. Minaev, L. S. Schroeder, K. E. Shestermanov, W. Peryt, B. Erazmus, A. Tai, G. Sood, L. Didenko, J. W. Watson, J. Amonett, A. Ogawa, G. J. Kunde, P. Yepes, V. Eckardt, J. Klay, B. V.K.S. Potukuchi, V. Emelianov, A. K. Bhati, D. Keane, S. Gronstal, Shengli Huang, Thomas A. Trainor, Yu-Gang Ma, Nikolai Smirnov, R. Stock, J. Mitchell, L. G. Efimov, T. K. Nayak, L. K. Mangotra, D. Cebra, S. Trentalange, M. Estienne, R. Manweiler, Yu Melnick, H. Bichsel, G. Odyniec, H. M. Spinka, M. Potekhin, David Lynn, H. G. Ritter, A. Hamed, J. G. Ma, A. M. Poskanzer, R. Bellwied, Andre Mischke, D. Thein, L. C. Bland, M. Kopytine, J. Fu, M. Tokarev, H. H. Wieman, A. A. Kuznetsov, L. Liu, J. Engelage, John N. Wood, Premomoy Ghosh, J. M. Landgraf, Olivier Ravel, Z. Liu, M. Strikhanov, P.A. Zolnierczuk, Christina Markert, J. Sandweiss, A. Billmeier, J. G. Cramer, C. O. Blyth, M. Kramer, B. Norman, T. J. Humanic, I.A. Savin, N. T. Porile, R. Varma, Yu A. Matulenko, M. Horsley, B. Stringfellow, T. S. McShane, J. N. Marx, Y. P. Viyogi, H. Z. Huang, A. Kumar, F. Du, Alexander Kovalenko, L. V. Nogach, V. I. Kravtsov, Zhenyu Zhang, W. Shao, R.J.M. Snellings, S. C. Phatak, R. Willson, D. G. Underwood, Lijuan Ruan, T. J. Hallman, Morton Kaplan, T. J. M. Symons, V. Ghazikhanian, J. L. Romero, E. Finch, E. Hjort, J. Carroll, S. K. Nayak, F. Laue, A. Szanto de Toledo, T. Pawlak, J. Porter, R.Kh. Kutuev, J. Berger, O. G. Grebenyuk, and V. B. Dunin

Subjects
Physics, Coalescence (physics), Nuclear and High Energy Physics, Meson production, 010308 nuclear & particles physics, Phi meson, 7. Clean energy, 01 natural sciences, Central region, Spectral line, Nuclear physics, 0103 physical sciences, Transverse momentum, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

We report the STAR measurement of ϕ meson production in Au + Au and p + p collisions at s N N = 200 GeV . Using the event mixing technique, the ϕ spectra and yields are obtained at mid-rapidity for five centrality bins in Au + Au collisions and for non-singly-diffractive p + p collisions. It is found that the ϕ transverse momentum distributions from Au + Au collisions are better fitted with a single-exponential while the p + p spectrum is better described by a double-exponential distribution. The measured nuclear modification factors indicate that ϕ production in central Au + Au collisions is suppressed relative to peripheral collisions when scaled by the number of binary collisions ( 〈 N bin 〉 ) . The systematics of 〈 p t 〉 versus centrality and the constant ϕ / K − ratio versus beam species, centrality, and collision energy rule out kaon coalescence as the dominant mechanism for ϕ production.

Published
2005

20. Charm quarks in medium and their contribution to di-electron spectra in relativistic heavy ion collisions

Author

Lijuan Ruan, Yifei Zhang, H. Xu, Zhongbin Xu, X. Dong, and Qun Wang

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, High Energy Physics::Lattice, High Energy Physics::Phenomenology, FOS: Physical sciences, Parton, Lattice QCD, Charm quark, Nuclear Theory (nucl-th), Nuclear physics, High Energy Physics::Experiment, Invariant mass, Charm (quantum number), Impact parameter, Nuclear Experiment, Relativistic Heavy Ion Collider
Abstract

We study the dynamics of charm quarks in the partonic medium and its implication to the di-electron spectra in high energy heavy ion collisions. The charm quarks traversing a thermal medium is simulated by the relativistic Langevin equation for elastic scatterings of charm quarks by thermal partons in an expanding fireball. The transport coefficients of charm quarks are calculated by the in-medium T-matrix method, where a static heavy quark potential is used with parameters fitted by the lattice QCD results. The di-electron invariant mass spectra are computed in most central collisions and are compared to the STAR data. The angular correlations of di-electrons are almost the same in $p+p$ and Au+Au collisions in the mass range $1.1, Comment: Revtex 4, 10 pages, 7 figures. Accepted version to PRC

Published
2014

21. Systematic study of the experimental measurements on ratios of differentΥstates

Author

Wangmei Zha, Lijuan Ruan, Zebo Tang, Shuai Yang, B. Huang, Chi Yang, and Zhongbin Xu

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Transverse momentum, Hadron, Yield ratio, Transverse mass, High Energy Physics::Experiment, Rapidity, Atomic physics, Nuclear Experiment, Energy (signal processing)
Abstract

The world data on yields and ratios of different $\ensuremath{\Upsilon}$ states created in hadron collisions at $\sqrt{s}=19\text{--}8000$ GeV are examined in a systematic way. We derive that the ratios of $\ensuremath{\Upsilon}(2S)/\ensuremath{\Upsilon}(1S)$ and $\ensuremath{\Upsilon}(3S)/\ensuremath{\Upsilon}(1S)$ are $0.290\ifmmode\pm\else\textpm\fi{}0.007(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.014(\mathrm{syst}.)$ and $0.131\ifmmode\pm\else\textpm\fi{}0.005(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.003(\mathrm{syst}.)$, respectively, for $p+p$ collisions at $\sqrt{s}=200$ GeV. A small energy dependence of these ratios is observed within the broad collision energies. In addition, the rapidity, transverse momentum, and transverse mass dependence of these ratios are also reported.

Published
2013

22. The di-lepton physics program at STAR

Author

Lijuan Ruan

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Hadron, Detector, High Energy Physics::Phenomenology, FOS: Physical sciences, Star (graph theory), Lower energy, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Relativistic Heavy Ion Collider, Nuclear Experiment, Lepton
Abstract

The recent results on di-electron production in $p+p$ and Au+Au collisions at $\sqrt{s_{_{NN}}} = 200$ GeV are presented. The cocktail simulations of di-electrons from light and heavy flavor hadron decays are reported and compared with data. The perspectives for di-lepton measurements in lower energy Au+Au collisions and with future detector upgrades are discussed., 9 pages, 12 figures, comments from the referee implemented, contribution to the 5th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (Hard Probes 2012)

Published
2012

24. Observation of an Antimatter Hypernucleus

Author

G. Eppley, F. Liu, J. H. Thomas, Xu Cai, Thorsten Sven Kollegger, J. Pluta, R. D. Majka, D. Kettler, J. Sowinski, W. Li, J. Y. Chen, S. Margetis, R. F. Clarke, J. Schambach, G. S. Averichev, L. H. Tarini, S. Heppelmann, Anju Bhasin, O. Catu, L. Koroleva, Yingcai Zhu, R. P. Redwine, A. Kocoloski, S. Q. Zhang, A. Lebedev, S. Dash, R. E. Tribble, A. K. Bhati, J. B. Zhang, D. D. Koetke, D. Keane, B. E. Bonner, Ross Milner, O. D. Tsai, Nikolai Smirnov, Gerald W Hoffmann, M. Elnimr, M. C. Cervantes, Xiang Sun, R. Stock, Xiaoping Zhang, O. I. Mal, L. K. Yoo, B. Grube, Sevil Salur, Y. Wang, K. Kajimoto, H. Bichsel, G. Odyniec, L. Li, J. Seele, M. Heinz, Lee Stuart Barnby, C-H. Lee, T. K. Nayak, Lokesh Kumar, M. Zawisza, L. Kotchenda, Sergey Voloshin, Christine Nattrass, J. W. Harris, Y. Zoulkarneeva, P. Yepes, A. Davila Leyva, J. L. Drachenberg, W. Guryn, A. H. Tang, W. M. Zhang, Andrey Vasiliev, Nu Xu, L. C. Bland, I. Bunzarov, Q. Wang, Y. Panebratsev, D. Grosnick, V. Kouchpil, Yi Zhang, Rolf K. Reed, E. Wingfield, B. Morozov, Janet Elizabeth Seger, A. M. Hoffman, T. R. Schuster, H. Z. Huang, S. Vokal, L. Sakrejda, Z. Xu, G. Lin, O. G. Grebenyuk, J. Fedorisin, Olga Evdokimov, Hao Qiu, R. S. Longacre, V. Ghazikhanian, G. Van Buren, M. M. Mondai, B. D. Anderson, L-X. Han, J. Kiryluk, R. R. Debbe, Jing Zhou, A. G. Knospe, J. G. Cramer, N. K. Pruthi, D. A. Morozov, P. Sorensen, D. Thein, M. R. Dutta Mazumdar, B. Erazmus, Jay Roberts, G. D. Westfall, Peter Graham Jones, W. Zhou, C. L. Jones, O. V. Rogachevskiy, P. R. Pujahari, C. B. Powell, T. P. Burton, Neeraj Gupta, M. C. Suarez, D. Cebra, S. Trentalange, D. N. Svirida, J. L. Romero, M. Kopytine, M. Tokarev, Jie Zhao, K. Yip, J. Kapitan, A. R. Timmins, Marcelo Gameiro Munhoz, D. J. Prindle, J. S. Wang, Zhibing Li, K. Kang, J. E. Draper, M. J. Skoby, Frank Jm Geurts, J. M. Nelson, S. M. Dogra, S. S. Shi, B. V.K.S. Potukuchi, Y. Fisyak, Debasish Das, Raghunath Sahoo, Yu-Gang Ma, E. Elhalhuli, M. A.C. Lamont, Yan Li, I. G. Alekseev, Donika Plyku, S. M. Guertin, M. A. Lisa, Alexandre Alarcon Do Passo Suaide, T. Pawlak, L. Didenko, Jie Liu, W. A. Love, A. Bridgeman, T. S. McShane, Jing-Han Chen, W. Peryt, Jifa Tian, Hanna Paulina Zbroszczyk, A. V. Alakhverdyants, E. Finch, L. Xue, Russell Richard Betts, D. R. Beavis, D. P. Mahapatra, R. S. Hollis, S. Baumgart, T. D. S. Stanislaus, G. Wang, G. Igo, J. Bouchet, J. Ulery, D. G. Underwood, P. Seyboth, E. J. Garcia-Solis, Lijuan Ruan, R. Fatemi, Michael Joseph Betancourt, J. Bieldk, Matthew Walker, K. Kauder, R. Witt, Xiaofeng Luo, D. R. Gangadharan, E. G. Judd, A. Lordanova, H. H. Wieman, H. G. Ritter, S. Mioduszewski, M. Shao, B. I. Abelev, Guo-Liang Ma, W. J. Llope, T. J. M. Symons, Y. J. Sun, L. G. Efimov, M. DePhillips, L. C. De Silva, J. Engelage, B. Haag, A. de Toledo, Jianping Cheng, Donald M. McDonald, R. Bellwied, L. K. Mangotra, R. Manweiler, Hongfang Liu, K. Krueger, S. Kabana, A. Geromitsos, Y. P. Viyogi, Premomoy Ghosh, Z. Chajecki, P. Fachini, B. K. Srivastava, J. M. Landgraf, Andrew Rose, B. Huang, Bernd Surrow, Michal Sumbera, E. Hjort, M. Strikhanov, Hank Crawford, Zebo Tang, A. S. Hirsch, M. J. M. Codrington, J. Konzer, A. Gupta, A. M. Poskanzer, Qian Yue, H. Caines, Haiyan Wang, C. Marken, Ki-Seok Choi, J. A. Vanfossen, J. C. Webb, J. C. Dunlop, Thomas Humanic, J. Sandweiss, R. Varma, James Prewitt Hays-Wehle, Yu A. Matulenko, B. S. Page, A. Kechechyan, M. Esdenne, Pawan Kumar Netrakanti, Q. H. Xu, Zubayer Ahammed, M. J. LeVine, S. W. Wissink, P. Kravtsov, D. P. Kikola, R. De Derradi Souza, B. Stringfellow, William Axel Leight, Hal Spinka, Thomas Peitzmann, M. Krus, S. R. Klein, N. L. Subba, R. Cendejas, M. Calderon, Nikola Poljak, Z. J. Sun, C. Perkins, Jorn Henning Putschke, A. V. Brandin, Xianglei Zhu, L. Huo, A. P. Meschanin, C. A. Gagliardi, P. Chung, Bedangadas Mohanty, M. Pachr, A. A. Derevschikov, H. Okada, R. G. Fersch, Wei Xie, David Jonathan Hofman, H. Masui, J. Joseph, M. Wada, Madan M. Aggarwal, Fuqiang Wang, G. M.S. Vasconcelos, Y. Pandit, M. Cherney, N. Schmitz, Peter Martin Jacobs, F. Videbæk, E. Shahaliev, J. Takahashi, Andre Mischke, Yong Xu, G. Webb, S. B. Nurushev, M. S. Ganti, W. L. Zhan, W. Christie, Chitrasen Jena, Frank Simon, Y. Yang, Y. P. Lu, V. Perevoztchikov, S. LaPointe, N. Li, A. Gordon, L. Selyuzhenkov, Ermes Braidot, Adam Ryszard Kisiel, S. Bueltmann, Subhasis Chattopadhyay, D. Tlusty, Mirko Planinic, Elena Bruna, Y. N. Gorbunov, Sergey Timoshenko, W. Xu, Wolfgang Korsch, X. Li, C. A. Whitten, Feng Jin, R. Corliss, A. Ogawa, S. J. Lindenbaum, Thomas A. Trainor, C-Q. Li, R. P. Scharenberg, Shoko Sakai, H. S. Matis, W. W. Jacobs, J. Lauret, M. Sharma, R. Lednicky, P. Djawotho, N. G. Minaev, P. Filip, P. Pile, Petr Jákl, P. Kurnadi, Zhenyu Zhang, M. Ploskon, M. K. Mttrovski, T. G. Dedovich, T. Sakuma, S. C. Phatak, V. Fine, D. Oison, Yuanfang Wu, Basanta Kumar Nandi, T. Tarnowsky, B. Biritz, V. A. Okorokov, L. V. Nogach, M. J. Ng, G. Van Nieuwenhuizen, Jongmin Lee, R. L. Ray, D. Staszak, T. Ljubicic, J. Bieldkova, Sudhir Raniwala, E. P. Sichtermann, J. Balewski, Rashmi Raniwala, Claude Andre Pruneau, T. Ullrich, R. Zoulkarneev, H. S. Xu, L. Eun, X. L. Wang, C. Zhong, M. van Leeuwen, X. Dong, S. K. Pal, Justin Stevens, A. Chikanian, V. N. Tram, E. Sangaline, D. Arkhipkin, A. Hamed, C. Roy, L. Koralt, P. Chaloupka, H. F. Chen, and Rama Narayana Singaraju

Subjects
Quark, Particle physics, Strange quark, Nuclear Theory, FOS: Physical sciences, Antineutron, Nuclear physics, Collisions, Nuclear Experiment (nucl-ex), Light Hypernuclei, Nuclear Experiment, Physics, Multidisciplinary, Hyperon, Search, Strangeness, Hypernucleus, Antiproton, Antimatter, Quark-Gluon-Plasma, High Energy Physics::Experiment, Hypertriton, Lifetime, antimatter, hypernucleus, STAR
Abstract

Nuclear collisions recreate conditions in the universe microseconds after the Big Bang. Only a very small fraction of the emitted fragments are light nuclei, but these states are of fundamental interest. We report the observation of antihypertritons - composed of an antiproton, antineutron, and antilambda hyperon - produced by colliding gold nuclei at high energy. Our analysis yields 70 +- 17 antihypertritons and 157 +- 30 hypertritons. The measured yields of hypertriton (antihypertriton) and helium3 (antihelium3) are similar, suggesting an equilibrium in coordinate and momentum space populations of up, down, and strange quarks and antiquarks, unlike the pattern observed at lower collision energies. The production and properties of antinuclei, and nuclei containing strange quarks, have implications spanning nuclear/particle physics, astrophysics, and cosmology., 20 pages, 5 figures

Published
2010

25. Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations

Author

Anik Gupta, X. Zhu, M. J. Skoby, Frank Jm Geurts, E. Elhalhuli, Mateusz Andrzej Ploskon, Jifa Tian, R. Witt, S. Mioduszewski, V. Yu Khodyrev, Xiangming Sun, Subrata Pal, Donald M. McDonald, B. K. Srivastava, B. Erazmus, S. Bueltmann, M. DePhillips, Boris Hippolyte, B. D. Anderson, L. H. Tarini, J. G. Cramer, Michal Sumbera, B. Grube, W. Guryn, O. G. Grebenyuk, Neeraj Gupta, D. Cebra, K. Yip, J. S. Wang, N. K. Pruthi, J. L. Drachenberg, Russell Richard Betts, J. Fedorisin, D. G. Underwood, Lijuan Ruan, S. Zhang, A. G. Knospe, M. Shao, Elena Bruna, T. J. Hallman, J. Cheng, T. J. M. Symons, L. C. De Silva, S. Trentalange, Basanta Kumar Nandi, P. Fachini, M. Estienne, A. Szanto de Toledo, J. Kapitan, A. R. Timmins, S. M. Dogra, L. Kotchenda, A. Feng, T. Tarnowsky, T. Pawlak, A. V. Alakhverdyants, K. S.F.F. Guimaraes, F. Videbæk, A. Ridiger, S. W. Wissink, B. Biritz, G. Eppley, W. Christie, L. C. Bland, Jay Roberts, A. K. Bhati, D. Keane, G. Webb, Q. H. Xu, Nikolai Smirnov, B. Haag, K. Kang, Xiaoping Zhang, Nikola Poljak, Sukalyan Chattopadhyay, L. K. Mangotra, I. Bnzarov, V. A. Okorokov, P. R. Pujahari, H. Bichsel, J. Pluta, M. S. Ganti, G. Odyniec, L. G. Efimov, Y. Zoulkarneeva, Zebo Tang, T. P. Burton, O. I. Mall, W. M. Zhang, Andrey Vasiliev, Jorn Henning Putschke, A. V. Brandin, S. Heppelmann, T. S. McShane, H. Okada, Chitrasen Jena, Haiyan Wang, R. Manweiler, Hongfang Liu, P. Kurnadi, C-H. Lee, T. K. Nayak, C. Roy, Z. Chajecki, R. N. Singaraju, Y. P. Lu, William Axel Leight, B. E. Bonner, Zhenyu Zhang, J. W. Harris, V. Perevoztchikov, S. E. Vigdor, Christian Claude Kuhn, L. Huo, A. P. Meschanin, X. Z. Cai, M. R. Cosentino, O. D. Tsai, S. Baumgart, L. Liu, Q. Wang, C. L. Jones, C. Perkins, A. M. Poskanzer, S. R. Klein, X. L. Wang, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, R. E. Tribble, M. J. Russcher, N. L. Subba, Matthew Walker, D. D. Koetke, J. E. Draper, Y. Fisyak, I. K. Yoo, D. L. Olson, Guo-Liang Ma, F. Benedosso, M. Elnimr, M. C. Cervantes, T. Peitzmann, A. Kechechyan, Andre Mischke, C. Zhong, Gerald W Hoffmann, Janet Elizabeth Seger, D. P. Mahapatra, David Jonathan Hofman, J. C. Dunlop, A. M. Hoffman, R. S. Hollis, Y. J. Sun, M. C. Suarez, H. Masui, V. Ghazikhanian, P. Yepes, I. Sakrejda, R. Milner, P. Chaloupka, M. Krus, R. Cendejas, K. Kajimoto, D. Thein, A. A. Derevschikov, S. Kabana, A. S. Hirsch, Zubayer Ahammed, J. C. Webb, M. J. LeVine, Y. P. Viyogi, J. X. Zuo, Anju Bhasin, Sergei A. Voloshin, P. Kravtsov, B. V.K.S. Potukuchi, M. Kopytine, A. Chikanian, T. J. Humanic, R. P. Redwine, Yu-Gang Ma, T. G. Dedovich, A. H. Tang, V. N. Tram, Jing Zhou, J. Engelage, Jana Bielcikova, X. Dong, Peter Martin Jacobs, Y. Yang, S. LaPointe, H. Z. Huang, S. Vokal, N. Li, D. R. Gangadharan, T. Sakuma, Christine Nattrass, Marcelo Gameiro Munhoz, D. J. Prindle, Qian Yue, S. C. Phatak, W. J. Llope, A. Lebedev, J. Sowinski, A. Gordon, E. G. Judd, A. Geromitsos, Premomoy Ghosh, Sevil Salur, Y. Wang, J. Takahashi, D. Arkhipkin, A. Hamed, R. Varma, P. Sorensen, V. Fine, X. H. Shi, T. D. S. Stanislaus, Yu A. Matulenko, Peter Graham Jones, A. Iordanova, M. Calderon De La Barca Sanchez, J. M. Landgraf, O. Catu, S. B. Nurushev, B. S. Page, Donika Plyku, M. A. Lisa, D. P. Kikola, H. H. Wieman, B. Stringfellow, M. Strikhanov, L. Didenko, Bedangadas Mohanty, J. Baudot, J. Kiryluk, J. Konzer, G. Van Buren, Ki-Seok Choi, A. Kocoloski, S. Dash, G. Wang, Jie Liu, Marek Bombara, J. Sandweiss, D. A. Morozov, P. Seyboth, S. S. Shi, Jongmin Lee, R. L. Ray, M. Zawisza, H. M. Spinka, Hanna Paulina Zbroszczyk, D. R. Beavis, M. Wada, F. Liu, T. W. Ludlam, M. Bystersky, J. L. Romero, J. M. Nelson, E. J. Garcia-Solis, D. Staszak, M. S. Daugherity, I. Koralt, Yan Li, Jing-Han Chen, W. Peryt, R. D. Majka, L. V. Nogach, M. J. Ng, J. H. Thomas, V. I. Kravtsov, G. Van Nieuwenhuizen, J. Y. Chen, S. Margetis, R. F. Clarke, J. Schambach, R. Derradi de Souza, B. I. Abelev, C-Q. Li, R. P. Scharenberg, Christina Markert, H. S. Matis, T. Ljubicic, J. Ulery, E. Finch, D. Kettler, H. G. Ritter, Y. Panebratsev, D. Grosnick, V. Kouchpil, M. J. M. Codrington, O. Barannikova, R. Bellwied, W. W. Jacobs, H. Caines, Sudhir Raniwala, J. Lauret, G. S. Averichev, L. Gaillard, A. Shabetai, R. Lednicky, P. Djawotho, C. A. Whitten, Feng Jin, Z. J. Sun, Yi Zhang, E. Hjort, Y. F. Wu, R. Corliss, Rolf K. Reed, E. P. Sichtermann, D. Tlusty, Mirko Planinic, J. Balewski, Rashmi Raniwala, Claude Andre Pruneau, S. J. Lindenbaum, T. Ullrich, Y. N. Gorbunov, N. Xu, P. Filip, R. Zoulkarneev, S. Sakai, L. Eun, P. Pile, G. D. Westfall, Sergey Timoshenko, Petr Jákl, Wolfgang Korsch, Xuan Wang, A. Ogawa, H. F. Chen, Thomas A. Trainor, Mikhail Tokarev, Ermes Braidot, M. Sharma, Adam Ryszard Kisiel, Wei Xie, H. J. Crawford, R. Fatemi, Michael Joseph Betancourt, J. Joseph, K. Krueger, G. M.S. Vasconcelos, M. Sarsour, N. G. Minaev, J. A. Vanfossen, Y. Pandit, N. Schmitz, W. He, E. Shahaliev, M. Cherney, Thomas Michael Cormier, Lokesh Kumar, M. Heinz, Lee Stuart Barnby, Jaroslav Bielcik, M. R. Dutta Mazumdar, O. V. Rogachevskiy, W. A. Love, I. Selyuzhenkov, Bernd Surrow, Pawan Kumar Netrakanti, C. A. Gagliardi, M. Pachr, Madan M. Aggarwal, Fuqiang Wang, Yong Xu, R. S. Longacre, W. L. Zhan, Frank Simon, Debasish Das, Raghunath Sahoo, M. A.C. Lamont, G. Igo, J. Bouchet, K. Kauder, Andrew Rose, Y. Zhao, Z. Xu, G. Lin, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), STAR, and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Nuclear and High Energy Physics, Meson, Astrophysics::High Energy Astrophysical Phenomena, Hadron, FOS: Physical sciences, Parton, scattering Brookhaven RHIC Coll parton, 01 natural sciences, 7. Clean energy, associated production angular correlation, Nuclear physics, Pion, 0103 physical sciences, interaction gold charged particle, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], yield parton, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), ComputingMilieux_MISCELLANEOUS, Physics, 010308 nuclear & particles physics, path length STAR 200 GeV-cms/nucleon, hadroproduction charged particle, dependence heavy ion, Charged particle, p p, energy loss photon, direct production pi0, (charged particle photon) angular correlation, (charged particle pi0) transverse momentum, NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika, High Energy Physics::Experiment, Atomic physics, Relativistic Heavy Ion Collider, STAR detector
Abstract

Charged-particle spectra associated with direct photon ($\gamma_{dir} $) and $\pi^0$ are measured in $p$+$p$ and Au+Au collisions at center-of-mass energy $\sqrt{s_{_{NN}}}=200$ GeV with the STAR detector at RHIC. A hower-shape analysis is used to partially discriminate between $\gamma_{dir}$ and $\pi^0$. Assuming no associated charged particles in the $\gamma_{dir}$ direction (near side) and small contribution from fragmentation photons ($\gamma_{frag}$), the associated charged-particle yields opposite to $\gamma_{dir}$ (away side) are extracted. At mid-rapidity ($|\eta, Comment: submitted to Phys. Rev. Lett, 6 pages, 4 figures

Published
2010

26. Long range rapidity correlations and jet production in high energy nuclear collisions

Author

M. DePhillips, Michal Sumbera, Hank Crawford, B. E. Bonner, P. R. Pujahari, S. W. Wissink, B. Haag, Nikola Poljak, L. Kotchenda, Bedangadas Mohanty, J. Lauret, O. D. Tsai, S. Kabana, B. Srivastava, M. Wada, M. Bystersky, L. C. Bland, F. Videbæk, T. P. Burton, N. Schmitz, M. Elnimr, I. K. Yoo, M. C. Cervantes, G. Webb, D. R. Gangadharan, Marcelo Gameiro Munhoz, D. J. Prindle, Zebo Tang, D. Thein, R. Milner, A. Shabetai, Debasish Das, A. Ridiger, Jongmin Lee, M. Heinz, Lee Stuart Barnby, A. H. Tang, K. Kang, Xiang Sun, R. L. Ray, B. Grube, M. Kopytine, Jie Liu, K. Kajimoto, E. G. Judd, Jaroslav Bielcik, Raghunath Sahoo, Hanna Paulina Zbroszczyk, M. A.C. Lamont, G. Igo, Mikhail Tokarev, S. Heppelmann, J. G. Cramer, Donika Plyku, Z. Chajecki, Sevil Salur, Y. Wang, M. A. Lisa, W. Guryn, William Axel Leight, L. Liu, C. L. Jones, D. R. Beavis, P. Filip, J. Bouchet, C. Perkins, M. R. Dutta Mazumdar, I. Sakrejda, M. S. Ganti, Z. J. Sun, H. Bichsel, M. C. Suarez, V. Fine, S. R. Klein, William Jacobs, N. L. Subba, J. Engelage, O. V. Rogachevskiy, T. Peitzmann, K. Kauder, Congbo Li, D. L. Olson, T. D. S. Stanislaus, A. Geromitsos, Premomoy Ghosh, D. Staszak, H. H. Wieman, J. X. Zuo, O. G. Grebenyuk, D. D. Koetke, S. Sakai, S. M. Guertin, G. Lin, P. Pile, W. A. Love, W. Christie, A. K. Bhati, D. Keane, Sudhir Raniwala, T. S. McShane, Anik Gupta, Alexandre Alarcon Do Passo Suaide, A. A. Derevschikov, D. Tlusty, J. Fedorisin, Nikolai Smirnov, Petr Jákl, L. V. Nogach, Y. Zoulkarneeva, Xiaoping Zhang, Ermes Braidot, Y. Yang, S. LaPointe, N. Li, D. P. Mahapatra, R. S. Hollis, Andrew Rose, Chitrasen Jena, Y. Zhao, Madan M. Aggarwal, Christine Nattrass, L. K. Mangotra, R. Manweiler, Hongfang Liu, O. I. Mall, Wei Xie, S. B. Nurushev, Sergei A. Voloshin, Mirko Planinic, A. G. Knospe, A. Gordon, S. Baumgart, C-H. Lee, T. K. Nayak, Fuqiang Wang, J. E. Draper, E. Shahaliev, Jorn Henning Putschke, M. Zawisza, P. Sorensen, X. H. Shi, Y. P. Lu, A. V. Brandin, M. J. Skoby, Frank Jm Geurts, L. G. Efimov, E. Elhalhuli, J. Konzer, Yong Xu, V. Perevoztchikov, B. D. Anderson, H. Okada, J. Joseph, G. M.S. Vasconcelos, Adam Ryszard Kisiel, Matthew Walker, S. E. Vigdor, J. Baudot, Jifa Tian, E. P. Sichtermann, Y. Panebratsev, D. Grosnick, V. Kouchpil, H. Caines, N. K. Pruthi, A. Kechechyan, Andre Mischke, Ki-Seok Choi, P. G. Jones, Christian Claude Kuhn, C. A. Whitten, Feng Jin, S. Vokal, Q. Wang, Yifu Sun, Christina Markert, Q. H. Xu, G. Eppley, J. Seger, R. Corliss, M. Krus, Y. Pandit, L. Didenko, R. Cendejas, Y. N. Gorbunov, Haiyan Wang, Jana Bielcikova, A. Szanto de Toledo, B. Erazmus, S. J. Lindenbaum, B. V.K.S. Potukuchi, Yi Zhang, Xu Cai, W. L. Zhan, J. Pluta, J. H. Thomas, M. J. Russcher, J. Kapitan, T. Ullrich, R. Fatemi, Michael Joseph Betancourt, H. G. Ritter, Y. P. Viyogi, Guo-Liang Ma, A. R. Timmins, S. M. Dogra, Y. Fisyak, M. S. Daugherity, Yu-Gang Ma, A. Hirsch, Rolf K. Reed, P. Kurnadi, Frank Simon, J. Balewski, Rashmi Raniwala, K. Yip, J. S. Wang, A. Chikanian, K. Krueger, A. Ogawa, Zhenyu Zhang, W. J. Llope, M. Sharma, R. N. Singaraju, L. Huo, A. P. Meschanin, T. Pawlak, M. R. Cosentino, J. A. Vanfossen, Claude Andre Pruneau, J. Sandweiss, R. E. Tribble, Gerald W Hoffmann, I. Selyuzhenkov, A. V. Alakhverdyants, J. C. Webb, J. Kiryluk, Sergey Timoshenko, P. Kravtsov, D. Kettler, F. Benedosso, W. He, Russell Richard Betts, Bernd Surrow, G. Wang, R. Zoulkarneev, M. Cherney, K. S.F.F. Guimaraes, Wolfgang Korsch, B. Stringfellow, Thomas Michael Cormier, E. Hjort, D. G. Underwood, G. S. Averichev, Lokesh Kumar, D. A. Morozov, P. Seyboth, E. J. Garcia-Solis, J. Sowinski, Lijuan Ruan, M. Sarsour, Gary Westfall, A. M. Poskanzer, Jing Zhou, Thomas Humanic, L. H. Tarini, L. Eun, R. Derradi de Souza, B. I. Abelev, S. Bueltmann, T. G. Dedovich, Pawan Kumar Netrakanti, M. Shao, Subhasis Chattopadhyay, T. J. Hallman, T. J. M. Symons, J. Ulery, T. Sakuma, Xuan Wang, T. Ljubicic, Jianping Cheng, Thomas A. Trainor, G. Odyniec, S. C. Phatak, L. C. De Silva, X. L. Wang, H. M. Spinka, C. Zhong, I. Bnzarov, S. S. Shi, Elena Bruna, H. Z. Huang, R. P. Scharenberg, C. A. Gagliardi, G. Van Buren, M. J. M. Codrington, X. Dong, H. S. Matis, M. Pachr, Neeraj Gupta, D. Cebra, V. Ghazikhanian, S. Trentalange, O. Barannikova, R. Bellwied, M. Estienne, V. N. Tram, I. Koralt, M. J. Ng, Marek Bombara, L. Gaillard, R. Lednicky, P. Djawotho, Zhongbin Xu, V. I. Kravtsov, G. Van Nieuwenhuizen, D. Arkhipkin, A. Hamed, E. Finch, A. Iordanova, T. W. Ludlam, Anju Bhasin, R. P. Redwine, J. M. Nelson, Yuanfang Wu, Yan Li, Jing-Han Chen, Basanta Kumar Nandi, W. Peryt, R. S. Longacre, T. Tarnowsky, B. Biritz, David Jonathan Hofman, H. Masui, V. A. Okorokov, P. Fachini, C. Roy, J. M. Landgraf, Peter Martin Jacobs, J. Takahashi, P. Chaloupka, S. Margetis, H. F. Chen, W. M. Zhang, Andrey Vasiliev, Nu Xu, A. M. Hoffman, F. Liu, J. L. Drachenberg, S. Zhang, M. Strikhanov, R. D. Majka, J. L. Romero, A. Feng, J. Y. Chen, R. F. Clarke, Jay Roberts, X. Zhu, Mateusz Andrzej Ploskon, R. Witt, S. Mioduszewski, V. Yu Khodyrev, Subrata Pal, Donald M. McDonald, Boris Hippolyte, J. C. Dunlop, Qian Yue, R. Varma, Yu A. Matulenko, B. S. Page, D. P. Kikola, Zubayer Ahammed, M. J. LeVine, M. Calderon De La Barca Sanchez, A. Lebedev, O. Catu, J. Schambach, A. Kocoloski, S. Dash, N. G. Minaev, J. W. Harris, and P. Yepes

Subjects
Nuclear and High Energy Physics, di-hadron, Hadron, FOS: Physical sciences, 01 natural sciences, Spectral line, Nuclear physics, correlations, 0103 physical sciences, Rapidity, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Physics, Jet (fluid), Range (particle radiation), 010308 nuclear & particles physics, Collaboration, NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika, Deuterium, Perspective, Quark–gluon plasma, Quark-Gluon Plasma, High Energy Physics::Experiment, Atomic physics, Relativistic Heavy Ion Collider
Abstract

The STAR Collaboration at RHIC presents a systematic study of high transverse momentum charged di-hadron correlations at small azimuthal pair separation \dphino, in d+Au and central Au+Au collisions at $\rts = 200$ GeV. Significant correlated yield for pairs with large longitudinal separation \deta is observed in central Au+Au, in contrast to d+Au collisions. The associated yield distribution in \detano$\times$\dphi can be decomposed into a narrow jet-like peak at small angular separation which has a similar shape to that found in d+Au collisions, and a component which is narrow in \dphi and \textcolor{black}{depends only weakly on} $\deta$, the "ridge". Using two systematically independent analyses, \textcolor{black}{finite ridge yield} is found to persist for trigger $\pt > 6$ \GeVc, indicating that it is correlated with jet production. The transverse momentum spectrum of hadrons comprising the ridge is found to be similar to that of bulk particle production in the measured range ($2 < \pt < 4 \GeVc$)., Submitted to Phys. Rev. C, 9 pages, 6 figures

Published
2009

27. Longitudinal spin transfer toΛandΛ¯hyperons in polarized proton-proton collisions ats=200 GeV

Author

B. Haag, L. K. Mangotra, R. Manweiler, Hongfang Liu, G. Eppley, Zebo Tang, Z. Chajecki, K. Yip, A. M. Poskanzer, J. C. Dunlop, J. S. Wang, H. Z. Huang, S. Vokal, C. Perkins, T. J. Humanic, J. Pluta, A. Kechechyan, Andre Mischke, Zubayer Ahammed, R. R. Debbe, D. Tlusty, Mirko Planinic, M. J. LeVine, R. S. Longacre, L. C. Bland, V. Ghazikhanian, J. Konzer, Adam Ryszard Kisiel, T. Peitzmann, H. J. Crawford, Qian Yue, M. Krus, R. Cendejas, Bedangadas Mohanty, Debasish Das, M. C. Suarez, Li Xue, J. W. Harris, J. Kiryluk, Y. N. Gorbunov, J. Ulery, H. G. Ritter, O. Barannikova, R. Bellwied, P. Kurnadi, J. L. Romero, Raghunath Sahoo, M. A.C. Lamont, Y. H. Zhu, R. Varma, James Prewitt Hays-Wehle, D. Thein, Zhenyu Zhang, Yu A. Matulenko, B. S. Page, F. Liu, D. A. Morozov, C-Q. Li, G. Igo, R. G. Fersch, R. E. Tribble, D. P. Kikola, E. Finch, Jorn Henning Putschke, P. Yepes, Z. Xu, G. Lin, B. Stringfellow, F. Benedosso, A. V. Brandin, A. H. Tang, L. Kotchenda, T. P. Burton, J. H. Chen, Gerald W Hoffmann, M. Kopytine, J. Bouchet, R. P. Scharenberg, Christina Markert, H. S. Matis, J. L. Drachenberg, M. Tokarev, Xing-Jiang Zhu, K. Kang, T. S. McShane, R. Fatemi, Michael Joseph Betancourt, Anik Gupta, H. Okada, G. Wang, R. D. Majka, Thorsten Sven Kollegger, M. Heinz, K. Krueger, W. W. Jacobs, N. Gupta, Xuan Zhang, Andrew Rose, Y. Zhao, T. G. Dedovich, Jay Roberts, E. Hjort, Y. F. Wu, E. P. Sichtermann, Lee Stuart Barnby, T. Sakuma, S. Margetis, S. Baumgart, J. A. Vanfossen, R. F. Clarke, J. Schambach, Frank Jm Geurts, S. C. Phatak, E. Elhalhuli, H. Masui, S. Heppelmann, P. Seyboth, Jifa Tian, S. Bueltmann, W. Christie, T. D. S. Stanislaus, J. Lauret, Q. H. Xu, Matthew Walker, R. Lednicky, Xiangming Sun, Guo-Liang Ma, V. Fine, E. J. Garcia-Solis, Jie Liu, W. M. Zhang, D. D. Koetke, J. E. Draper, Y. J. Sun, K. Kauder, Andrey Vasiliev, Jake Y. Chen, H. H. Wieman, Jaroslav Bielcik, P. Djawotho, I. K. Yoo, G. Van Buren, R. N. Singaraju, L. Huo, A. P. Meschanin, M. Cherney, S. Kabana, Lokesh Kumar, Hanna Paulina Zbroszczyk, I. Sakrejda, K. Kajimoto, P. Chung, Y. P. Viyogi, S. S. Shi, J. Balewski, Rashmi Raniwala, P. R. Pujahari, B. D. Anderson, Sergey Timoshenko, Wei Xie, J. Joseph, D. R. Gangadharan, E. G. Judd, Janet Elizabeth Seger, A. M. Hoffman, D. R. Beavis, R. Derradi de Souza, B. I. Abelev, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, Y. Yang, G. M.S. Vasconcelos, T. W. Ludlam, Yinina Ma, Anju Bhasin, M. R. Dutta Mazumdar, J. G. Cramer, S. LaPointe, N. Li, Mateusz Andrzej Ploskon, R. Witt, N. K. Pruthi, W. Xu, Wolfgang Korsch, A. S. Hirsch, O. V. Rogachevskiy, J. M. Nelson, Y. Pandit, M. DePhillips, R. P. Redwine, S. Mioduszewski, Claude Andre Pruneau, S. Q. Zhang, C. L. Jones, A. Gordon, D. P. Mahapatra, N. Schmitz, R. S. Hollis, I. Koralt, A. Lebedev, V. Yu Khodyrev, L. V. Nogach, Donald M. McDonald, J. Engelage, M. J. Ng, V. I. Kravtsov, T. R. Schuster, Sergey Voloshin, Christine Nattrass, J. C. Webb, E. Shahaliev, Yan Li, P. Kravtsov, W. Peryt, Michal Sumbera, R. Reed, B. K. Srivastava, A. Chikanian, M. J. Skoby, G. Van Nieuwenhuizen, A. Bridgeman, W. A. Love, O. Catu, Xuan Wang, Ross Milner, S. W. Wissink, A. Ogawa, H. F. Chen, A. Geromitsos, M. K. Mitrovski, Thomas A. Trainor, T. Ullrich, A. Kocoloski, Nikola Poljak, S. Dash, Premomoy Ghosh, J. M. Landgraf, M. Wada, W. Zhou, Haiyan Wang, W. J. Llope, M. J. M. Codrington, R. Zoulkarneev, M. Strikhanov, V. N. Tram, X. Z. Cai, Ki-Seok Choi, I. Selyuzhenkov, Vitaly Okorokov, J. Sandweiss, David Jonathan Hofman, M. Sharma, Bernd Surrow, J. Sowinski, Peter Martin Jacobs, M. Calderón De Labarcasánchez, J. Takahashi, S. B. Nurushev, O. I. Mall, L. Eun, L-X. Han, Pawan Kumar Netrakanti, J. Seele, C. A. Gagliardi, J. H. Thomas, B. V.K.S. Potukuchi, F. Videbæk, M. Pachr, Y. Fisyak, D. Arkhipkin, G. Webb, A. Hamed, Madan M. Aggarwal, Fuqiang Wang, J. M. Rehberg, X. L. Wang, D. Kettler, Yong Xu, N. G. Minaev, G. S. Averichev, Sukalyan Chattopadhyay, A. Iordanova, C. Zhong, M. S. Ganti, W. L. Zhan, Frank Simon, L. H. Tarini, P. Pile, X. Dong, Chitrasen Jena, N. Xu, P. Filip, Y. P. Lu, I. Bnzarov, V. Perevoztchikov, S. K. Pal, Justin Stevens, Z. J. Sun, S. Sakai, G. D. Westfall, Basanta Kumar Nandi, Petr Jákl, T. Tarnowsky, B. Biritz, Jongmin Lee, R. L. Ray, X. Li, Elena Bruna, C. Roy, D. Staszak, T. Ljubicic, M. Zawisza, H. M. Spinka, C. A. Whitten, Feng Jin, A. Szanto de Toledo, J. Kapitan, L. C. DeSilva, R. Corliss, H. Caines, Sudhir Raniwala, P. Chaloupka, A. R. Timmins, S. M. Dogra, S. J. Lindenbaum, T. Pawlak, A. V. Alakhverdyants, Russell Richard Betts, D. G. Underwood, Lijuan Ruan, P. Fachini, M. Shao, William Axel Leight, S. R. Klein, N. L. Subba, D. L. Olson, T. J. Hallman, J. Cheng, T. J. M. Symons, A. A. Derevschikov, Jana Bielcikova, B. Grube, P. Sorensen, Peter Graham Jones, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, Zhibing Li, W. Guryn, L. Didenko, O. G. Grebenyuk, J. Fedorisin, A. G. Knospe, Q. Wang, M. J. Russcher, Jing Zhou, B. Erazmus, D. Cebra, S. Trentalange, M. Estienne, Marcelo Gameiro Munhoz, D. J. Prindle, Donika Plyku, M. A. Lisa, E. Braidot, A. K. Bhati, D. Keane, Nikolai Smirnov, R. Stock, L. G. Efimov, C-H. Lee, T. K. Nayak, Y. Panebratsev, D. Grosnick, V. Kouchpil, Yi Zhang, B. E. Bonner, O. D. Tsai, M. Elnimr, M. C. Cervantes, Sevil Salur, and Y. Wang

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Lambda, Lambda baryon, 7. Clean energy, 01 natural sciences, Nuclear physics, Baryon, Pseudorapidity, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, STAR detector
Abstract

The longitudinal spin transfer, D(LL), from high energy polarized protons to Lambda and Lambda hyperons has been measured for the first time in proton-proton collisions at s=200 GeV with the STAR detector at the Relativistic Heavy Ion Collider. The measurements cover pseudorapidity, eta, in the range |eta| >=0.5 and >=3.7 GeV/c. The dependence on eta and p(T) is presented.

Published
2009

28. Neutral pion production inAu+Aucollisions atsNN=200GeV

Author

O. I. Mall, A. Ridiger, K. Kajimoto, S. Heppelmann, B. V.S. Potukuchi, Yu-Gang Ma, R. Fatemi, Michael Joseph Betancourt, J. L. Drachenberg, P. Fachini, I. Selyuzhenkov, K. S.F.F. Guimaraes, K. Krueger, D. D. Koetke, J. E. Draper, J. A. Vanfossen, N. Gupta, A. Feng, K. Kang, Sergey Voloshin, Christine Nattrass, Jay Roberts, Xuan Zhang, Z. Xu, G. Lin, Jie Liu, Hanna Paulina Zbroszczyk, W. He, M. Cherney, D. R. Beavis, M. Zawisza, H. M. Spinka, Bernd Surrow, W. J. Llope, Anik Gupta, T. J. Humanic, Thomas Michael Cormier, Lokesh Kumar, H. Bichsel, M. Sarsour, G. Odyniec, Y. Zoulkarneeva, William Axel Leight, J. H. Thomas, Qian Yue, Frank Jm Geurts, E. Elhalhuli, S. R. Klein, N. L. Subba, E. Hjort, Pawan Kumar Netrakanti, R. Varma, Yu A. Matulenko, B. S. Page, P. Kurnadi, Jifa Tian, D. L. Olson, Zhenyu Zhang, D. P. Kikola, B. Grube, Q. Wang, M. J. Russcher, H. Z. Huang, S. Vokal, M. R. Cosentino, B. Stringfellow, T. S. McShane, D. Kettler, A. A. Derevschikov, J. C. Dunlop, Haiyan Wang, F. Benedosso, C. A. Gagliardi, M. Pachr, G. S. Averichev, S. Baumgart, D. Thein, J. Engelage, J. Kiryluk, Matthew Walker, X. Z. Cai, J. Baudot, M. Wada, S. Bueltmann, Zubayer Ahammed, Jana Bielcikova, B. Haag, T. G. Dedovich, W. Guryn, D. A. Morozov, M. J. LeVine, L. Kotchenda, M. Heinz, A. Geromitsos, Y. J. Sun, Lee Stuart Barnby, T. Sakuma, S. C. Phatak, M. Kopytine, V. Fine, Jaroslav Bielcik, G. Van Buren, L. H. Tarini, S. Kabana, Premomoy Ghosh, J. M. Landgraf, Y. P. Viyogi, Zebo Tang, P. Sorensen, X. H. Shi, Jing Zhou, K. Yip, P. R. Pujahari, J. S. Wang, Peter Graham Jones, O. G. Grebenyuk, V. Ghazikhanian, Bedangadas Mohanty, J. Konzer, Adam Ryszard Kisiel, M. Tokarev, T. P. Burton, M. R. Dutta Mazumdar, J. G. Cramer, T. W. Ludlam, Xing-Jiang Zhu, B. Erazmus, M. Calderon De La Barca Sanchez, Z. Chajecki, Xiangming Sun, I. Bnzarov, M. Strikhanov, Marek Bombara, J. Fedorisin, O. V. Rogachevskiy, J. M. Nelson, H. J. Crawford, Elena Bruna, C. L. Jones, Yan Li, S. M. Guertin, J. L. Romero, L. Didenko, W. A. Love, S. S. Shi, A. G. Knospe, R. Reed, C. Perkins, Jing-Han Chen, W. Peryt, Ki-Seok Choi, Alexandre Alarcon Do Passo Suaide, D. Cebra, S. Trentalange, M. Estienne, J. Sandweiss, D. P. Mahapatra, David Jonathan Hofman, I. Koralt, Madan M. Aggarwal, T. Peitzmann, H. Masui, Fuqiang Wang, R. S. Hollis, E. Finch, L. V. Nogach, M. J. Ng, Marcelo Gameiro Munhoz, T. D. S. Stanislaus, V. I. Kravtsov, G. Van Nieuwenhuizen, A. Szanto de Toledo, Yong Xu, Mateusz Andrzej Ploskon, R. Witt, D. J. Prindle, S. Mioduszewski, J. Kapitan, A. R. Timmins, S. M. Dogra, V. Yu Khodyrev, H. H. Wieman, Donika Plyku, M. Bystersky, I. Sakrejda, M. A. Lisa, Guo-Liang Ma, Peter Martin Jacobs, T. Pawlak, E. Braidot, W. L. Zhan, J. X. Zuo, Frank Simon, J. Takahashi, B. D. Anderson, A. V. Alakhverdyants, L. K. Mangotra, Donald M. McDonald, R. Manweiler, Hongfang Liu, B. K. Srivastava, M. DePhillips, Russell Richard Betts, S. B. Nurushev, D. G. Underwood, A. M. Poskanzer, Lijuan Ruan, Michal Sumbera, Boris Hippolyte, Y. Yang, S. LaPointe, N. Li, N. K. Pruthi, A. Kechechyan, Andre Mischke, M. Shao, T. J. Hallman, J. Cheng, Wei Xie, T. J. M. Symons, S. W. Wissink, A. Gordon, J. Joseph, L. C. De Silva, Nikola Poljak, M. Krus, R. Cendejas, Jorn Henning Putschke, A. V. Brandin, A. S. Hirsch, J. C. Webb, P. Kravtsov, G. M.S. Vasconcelos, Y. Pandit, W. Christie, G. Eppley, H. Okada, N. Schmitz, I. K. Yoo, E. Shahaliev, S. E. Vigdor, Christian Claude Kuhn, J. Pluta, D. R. Gangadharan, E. G. Judd, J. Sowinski, W. M. Zhang, F. Videbæk, G. Webb, Sukalyan Chattopadhyay, Andrey Vasiliev, L. C. Bland, M. S. Ganti, R. E. Tribble, Gerald W Hoffmann, Chitrasen Jena, R. S. Longacre, Yuanfang Wu, Y. P. Lu, V. Perevoztchikov, L. Liu, J. W. Harris, Debasish Das, Raghunath Sahoo, M. C. Suarez, Chang-Hwan Lee, M. A.C. Lamont, Janet Elizabeth Seger, Basanta Kumar Nandi, A. M. Hoffman, G. Igo, T. Tarnowsky, Anju Bhasin, P. Yepes, B. Biritz, R. P. Redwine, A. H. Tang, J. Bouchet, V. A. Okorokov, S. Q. Zhang, K. Kauder, A. Lebedev, C. Roy, A. Shabetai, Andrew Rose, D. Tlusty, Y. Zhao, Mirko Planinic, Q. H. Xu, J. Ulery, Z. J. Sun, Ross Milner, O. Catu, Y. N. Gorbunov, H. G. Ritter, R. N. Singaraju, A. Kocoloski, L. Huo, A. P. Meschanin, P. Chaloupka, C-Q. Li, S. Dash, F. Liu, R. P. Scharenberg, Christina Markert, Y. Fisyak, H. S. Matis, O. Barannikova, R. Bellwied, W. W. Jacobs, J. Lauret, L. Gaillard, G. Wang, R. Lednicky, P. Djawotho, R. D. Majka, P. Seyboth, E. J. Garcia-Solis, J. Y. Chen, S. Margetis, R. F. Clarke, J. Schambach, A. Chikanian, M. J. Skoby, V. N. Tram, Sergey Timoshenko, R. Derradi de Souza, B. I. Abelev, Wolfgang Korsch, M. J. M. Codrington, D. Arkhipkin, A. Hamed, A. Iordanova, M. S. Daugherity, Xuan Wang, A. Ogawa, H. F. Chen, Thomas A. Trainor, N. Xu, P. Filip, S. Sakai, P. Pile, G. D. Westfall, Petr Jákl, C. A. Whitten, Feng Jin, X. L. Wang, C. Zhong, X. Dong, R. Corliss, S. K. Pal, B. E. Bonner, E. P. Sichtermann, J. Balewski, Rashmi Raniwala, O. D. Tsai, Claude Andre Pruneau, S. J. Lindenbaum, T. Ullrich, R. Zoulkarneev, L. Eun, Jongmin Lee, R. L. Ray, D. Staszak, M. Elnimr, M. C. Cervantes, T. Ljubicic, H. Caines, Sudhir Raniwala, M. Sharma, N. G. Minaev, Sevil Salur, Y. Wang, A. K. Bhati, D. Keane, Nikolai Smirnov, L. G. Efimov, T. K. Nayak, Y. Panebratsev, D. Grosnick, V. Kouchpil, and Yi Zhang

Subjects
Physics, Quark, Nuclear and High Energy Physics, Particle physics, Time projection chamber, Meson, 010308 nuclear & particles physics, Nuclear Theory, Parton, Electron, 01 natural sciences, Spectral line, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

The results of midrapidity (0 < y < 0.8) neutral pion spectra over an extended transverse momentum range (1 < p(T) < 12 GeV/c) in root s(NN) = 200 GeV Au + Au collisions, measured by the STAR experiment, are presented. The neutral pions are reconstructed from photons measured either by the STAR Barrel Electro-Magnetic Calorimeter or by the Time Projection Chamber via tracking of conversion electron-positron pairs. Our measurements are compared to previously published pi(+/-) and pi(0) results. The nuclear modification factors R(CP) and R(AA) of pi(0) are also presented as a function of p(T). In the most central Au + Au collisions, the binary collision scaled pi(0) yield at high p(T) is suppressed by a factor of about 5 compared to the expectation from the yield of p + p collisions. Such a large suppression is in agreement with previous observations for light quark mesons and is consistent with the scenario that partons suffer considerable energy loss in the dense medium formed in central nucleus-nucleus collisions at the Relativistic Heavy Ion Collider.

Published
2009

29. Azimuthal charged-particle correlations and possible local strong parity violation

Author

B. Erazmus, Neeraj Gupta, D. Cebra, S. Trentalange, M. Estienne, Marcelo Gameiro Munhoz, D. J. Prindle, H. Bichsel, Y. Zoulkarneeva, Donika Plyku, Q. Wang, M. J. Russcher, M. A. Lisa, Jing Zhou, L. Kotchenda, A. Ridiger, T. Sakuma, S. Heppelmann, K. Yip, J. S. Wang, D. D. Koetke, Guo-Liang Ma, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, Yannis K. Semertzidis, P. Filip, Sergei A. Voloshin, E. Shahaliev, G. Lin, G. Wang, P. Seyboth, E. J. Garcia-Solis, D. P. Mahapatra, J. C. Webb, R. S. Hollis, S. Sakai, Jorn Henning Putschke, A. V. Brandin, P. Pile, Anik Gupta, P. Kravtsov, H. Okada, S. Vokal, G. Eppley, R. Derradi de Souza, B. I. Abelev, Petr Jákl, J. E. Draper, M. J. Skoby, Frank Jm Geurts, D. G. Underwood, J. Pluta, E. Elhalhuli, G. Van Buren, S. S. Shi, Jifa Tian, Jianping Cheng, D. Thein, J. Sowinski, Christine Nattrass, K. Kang, C-Q. Li, M. J. M. Codrington, B. E. Bonner, O. D. Tsai, S. Bueltmann, T. W. Ludlam, J. M. Nelson, Yan Li, J. Kiryluk, N. Schmitz, W. J. Llope, B. Grube, P. Chung, R. E. Tribble, E. G. Judd, M. Kopytine, I. Sakrejda, M. Sharma, J. G. Cramer, M. Elnimr, M. C. Cervantes, J. Sandweiss, Subhasis Chattopadhyay, R. P. Scharenberg, H. S. Matis, H. M. Spinka, B. Haag, Jing-Han Chen, W. Peryt, W. Guryn, Elena Bruna, J. Joseph, Gerald W Hoffmann, G. M.S. Vasconcelos, J. X. Zuo, D. A. Morozov, Xiang Sun, Z. J. Sun, Y. Pandit, Zebo Tang, J. Engelage, P. R. Pujahari, Xuan Zhang, Jie Liu, R. Lednicky, O. G. Grebenyuk, T. D. S. Stanislaus, P. Djawotho, L. G. Efimov, L. H. Tarini, F. Videbæk, V. Ghazikhanian, Z. Chajecki, C. A. Whitten, Feng Jin, Hanna Paulina Zbroszczyk, T. P. Burton, Sevil Salur, Y. Wang, G. Webb, A. Geromitsos, H. H. Wieman, Y. Yang, J. Fedorisin, D. R. Beavis, Premomoy Ghosh, F. Liu, A. Bridgeman, T. S. McShane, Haiyan Wang, T. Ullrich, R. Corliss, Zhongbin Xu, Y. Panebratsev, D. Grosnick, A. G. Knospe, L. K. Mangotra, V. Kouchpil, I. K. Yoo, Jana Bielcikova, L. V. Nogach, Y. Fisyak, M. S. Ganti, C. Perkins, X. Z. Cai, S. J. Lindenbaum, A. Ogawa, S. Baumgart, S. LaPointe, N. Li, D. Tlusty, A. Gordon, R. Manweiler, Mirko Planinic, T. Peitzmann, Yi Zhang, J. Konzer, B. D. Anderson, E. Finch, O. I. Mall, W. Christie, Matthew Walker, Rolf K. Reed, Chitrasen Jena, H. Caines, A. Szanto de Toledo, J. Kapitan, Ki-Seok Choi, N. K. Pruthi, A. R. Timmins, D. R. Gangadharan, S. M. Dogra, David Jonathan Hofman, William Jacobs, Y. N. Gorbunov, Christina Markert, Y. P. Lu, V. Perevoztchikov, E. Hjort, Y. F. Wu, H. Masui, Y. J. Sun, B. V.K.S. Potukuchi, Yinina Ma, A. Hirsch, M. Calderón De La BarcaSánchez, A. Kechechyan, Andre Mischke, T. Pawlak, I. Bnzarov, Thomas Humanic, J. M. Landgraf, Peter Martin Jacobs, Bedangadas Mohanty, S. Kabana, J. Takahashi, A. K. Bhati, D. Keane, A. V. Alakhverdyants, M. Krus, R. Cendejas, Nikolai Smirnov, Sergey Timoshenko, J. Lauret, X. R. Wang, Y. P. Viyogi, B. Srivastava, P. Fachini, C-H. Lee, T. K. Nayak, Russell Richard Betts, K. S.F.F. Guimaraes, Wolfgang Korsch, B. Stringfellow, Jongmin Lee, Lijuan Ruan, V. Dzhordzhadze, R. L. Ray, M. Wada, Gary Westfall, Xiaofeng Zhu, Qian Yue, M. DePhillips, J. W. Harris, S. B. Nurushev, M. Shao, Michal Sumbera, Hank Crawford, R. Varma, D. Staszak, T. J. Hallman, T. Ljubicic, T. J. M. Symons, Yu A. Matulenko, B. S. Page, P. Sorensen, X. H. Shi, S. W. Wissink, D. P. Kikola, L. C. De Silva, P. Yepes, Peter Graham Jones, Sudhir Raniwala, K. Kajimoto, Nikola Poljak, Saskia Mioduszewski, A. Lebedev, O. Catu, J. Schambach, S. Dash, N. G. Minaev, Anju Bhasin, L. Didenko, R. P. Redwine, X. L. Wang, J. Seele, C. Zhong, S. Q. Zhang, R. S. Longacre, X. Dong, Ross Milner, E. P. Sichtermann, J. Balewski, Rashmi Raniwala, Claude Andre Pruneau, Hengchang Liu, M. Zawisza, R. D. Majka, William Axel Leight, R. Zoulkarneev, A. M. Poskanzer, R. F. Clarke, L. Eun, W. M. Zhang, Andrey Vasiliev, Nu Xu, A. M. Hoffman, S. R. Klein, N. L. Subba, D. L. Olson, J. H. Thomas, A. A. Derevschikov, D. Kettler, G. S. Averichev, R. Fatemi, Michael Joseph Betancourt, H. G. Ritter, K. Krueger, J. L. Drachenberg, J. A. Vanfossen, M. Strikhanov, J. L. Romero, A. Feng, M. Cherney, Thomas Michael Cormier, Lokesh Kumar, Jay Roberts, A. H. Tang, Mikhail Tokarev, Ermes Braidot, J. C. Dunlop, Madan M. Aggarwal, Adam Ryszard Kisiel, Fuqiang Wang, Zubayer Ahammed, M. J. LeVine, Yong Xu, W. L. Zhan, Frank Simon, Mateusz Andrzej Ploskon, R. Witt, M. Heinz, Lee Stuart Barnby, Jaroslav Bielcik, V. Yu Khodyrev, Subrata Pal, Donald M. McDonald, M. R. Dutta Mazumdar, O. V. Rogachevskiy, W. Xie, W. A. Love, I. Selyuzhenkov, Bernd Surrow, Pawan Kumar Netrakanti, G. Odyniec, C. A. Gagliardi, M. Pachr, Q. H. Xu, R. N. Singaraju, L. Huo, A. P. Meschanin, Debasish Das, Raghunath Sahoo, M. A.C. Lamont, G. Igo, J. Bouchet, K. Kauder, Andrew Rose, Y. Zhao, Basanta Kumar Nandi, T. Tarnowsky, B. Biritz, V. A. Okorokov, A. Chikanian, V. N. Tram, V. Fine, Jake Y. Chen, D. Arkhipkin, A. Hamed, I. Koralt, M. J. Ng, V. I. Kravtsov, G. Van Nieuwenhuizen, P. Kurnadi, A. Iordanova, Zhenyu Zhang, M. R. Cosentino, F. Benedosso, C. Roy, T. G. Dedovich, S. C. Phatak, P. Chaloupka, S. Margetis, H. F. Chen, J. Seger, M. S. Daugherity, L. C. Bland, L. Liu, C. L. Jones, M. C. Suarez, A. Kocoloski, J. Ulery, H. Z. Huang, O. Barannikova, and R. Bellwied

Subjects
Quark, Particle physics, QCD vacuum, Hadron, General Physics and Astronomy, FOS: Physical sciences, 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Nuclear Collisions, parity violation, Physics, Quantum chromodynamics, 010308 nuclear & particles physics, Heavy-Ion Collisions, Observable, Fermion, NATURAL SCIENCES. Physics, Charged particle, PRIRODNE ZNANOSTI. Fizika, Hot Qcd, High Energy Physics::Experiment, charged hadrons, STAR detector
Abstract

Parity-odd domains, corresponding to non-trivial topological solutions of the QCD vacuum, might be created during relativistic heavy ion collisions. These domains are predicted to lead to charge separation of quarks along the system's orbital momentum axis. We investigate a three particle azimuthal correlator which is a \P even observable, but directly sensitive to the charge separation effect. We report measurements of charged hadrons near center-of-mass rapidity with this observable in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$=200 GeV using the STAR detector. A signal consistent with several expectations from the theory is detected. We discuss possible contributions from other effects that are not related to parity violation., Comment: version as published in Physical Review Letters. Figure 3 from earlier versions has been removed to add room for new Figure 1

Published
2009

30. Pion interferometry inAu+AuandCu+Cucollisions atsNN=62.4and 200 GeV

Author

Q. H. Xu, N. Xu, V. Ghazikhanian, P. Filip, R. N. Singaraju, A. P. Meschanin, G. D. Westfall, S. S. Shi, T. S. McShane, S. Chattopadhyay, Petr Jákl, H. Z. Huang, S. Vokal, Marek Bombara, B. E. Bonner, Z. Xu, G. Lin, F. Du, L. C. Bland, J. L. Romero, S. Baumgart, O. D. Tsai, Raimond Snellings, Anik Gupta, L. V. Nogach, M. J. Ng, Matthew Walker, V. I. Kravtsov, Xiangming Sun, J. Kiryluk, M. Elnimr, M. C. Cervantes, P. Kurnadi, M. J. Skoby, Frank Jm Geurts, E. Elhalhuli, Zhenyu Zhang, M. R. Cosentino, E. Finch, Jifa Tian, Y. J. Sun, F. Benedosso, L. K. Mangotra, B. D. Anderson, G. Eppley, D. A. Morozov, J. Pluta, N. K. Pruthi, M. Sharma, M. Pachr, R. E. Tribble, Gerald W Hoffmann, R. Manweiler, S. Kabana, G. Wang, Y. P. Viyogi, T. G. Dedovich, W. T. Waggoner, N. G. Minaev, L. Liu, C. L. Jones, R. S. Longacre, Madan M. Aggarwal, A. M. Poskanzer, T. Sakuma, S. C. Phatak, Sergey Timoshenko, A. Ridiger, Sevil Salur, Y. Wang, M. C. Suarez, I. Sakrejda, P. Seyboth, E. J. Garcia-Solis, T. J. Humanic, Chang-Hwan Lee, Fuqiang Wang, Debasish Das, Raghunath Sahoo, A. Kechechyan, Andre Mischke, B. Haag, S. Heppelmann, V. Fine, A. Szanto de Toledo, J. Kapitan, M. A.C. Lamont, Ermes Braidot, G. Igo, J. X. Zuo, M. Krus, R. Cendejas, S. M. Dogra, Yong Xu, C. A. Whitten, Feng Jin, V. Emelianov, Adam Ryszard Kisiel, H. J. Crawford, Zebo Tang, Qian Yue, Wolfgang Korsch, Guo-Liang Ma, J. Bouchet, William Axel Leight, A. K. Bhati, D. Keane, J. C. Dunlop, I. K. Yoo, J. W. Harris, R. Corliss, Nikolai Smirnov, S. R. Klein, T. Pawlak, J. Engelage, R. Derradi de Souza, B. I. Abelev, R. Varma, R. Fatemi, Michael Joseph Betancourt, Z. Chajecki, D. Thein, Zubayer Ahammed, K. Krueger, S. LaPointe, N. Li, D. D. Koetke, J. E. Draper, J. Mitchell, S. J. Lindenbaum, Yu A. Matulenko, B. S. Page, X. Z. Cai, C. Perkins, J. A. Vanfossen, L. G. Efimov, T. Tarnowsky, N. L. Subba, M. Kopytine, A. Gordon, D. L. Olson, M. J. LeVine, Andrew Rose, Y. Zhao, D. P. Kikola, M. Tokarev, T. Peitzmann, B. Stringfellow, W. He, M. J. M. Codrington, Frank Simon, T. K. Nayak, M. Cherney, Thomas Michael Cormier, J. S. Wang, Lokesh Kumar, M. Sarsour, I. Selyuzhenkov, Wei Xie, Xuan Wang, A. A. Derevschikov, D. R. Gangadharan, A. L. Trattner, A. S. Hirsch, J. C. Webb, Russell Richard Betts, T. D. S. Stanislaus, J. Ulery, J. G. Cramer, E. G. Judd, Bernd Surrow, P. Kravtsov, A. Ogawa, H. F. Chen, Anthony R. Timmins, Jana Bielcikova, H. H. Wieman, J. Joseph, D. G. Underwood, Thomas A. Trainor, W. R. Edwards, G. M.S. Vasconcelos, Jorn Henning Putschke, A. Geromitsos, A. V. Brandin, E. P. Sichtermann, H. Okada, P. Yepes, Premomoy Ghosh, H. G. Ritter, David Jonathan Hofman, Y. Panebratsev, J. L. Drachenberg, Lijuan Ruan, P. Sorensen, X. H. Shi, S. E. Vigdor, J. Balewski, Christian Claude Kuhn, Rashmi Raniwala, Claude Andre Pruneau, Peter Graham Jones, J. M. Landgraf, Bedangadas Mohanty, Pawan Kumar Netrakanti, A. Stadnik, Y. Pandit, D. Grosnick, V. Kouchpil, Y. Fisyak, O. Barannikova, R. Bellwied, A. Feng, T. Ullrich, A. H. Tang, M. Shao, C-Q. Li, T. J. Hallman, J. Cheng, L. Didenko, Peter Martin Jacobs, L. Gaillard, T. J. M. Symons, R. Zoulkarneev, R. P. Scharenberg, Christina Markert, Jay Roberts, J. Takahashi, N. Schmitz, Yang Yang, C. A. Gagliardi, L. C. De Silva, S. B. Nurushev, E. Shahaliev, H. S. Matis, W. J. Llope, M. Strikhanov, J. Sowinski, M. Heinz, A. Shabetai, Lee Stuart Barnby, L. Eun, M. Wada, B. Grube, Yi Zhang, G. Van Buren, M. Bystersky, Jaroslav Bielcik, P. Fachini, K. S.F.F. Guimaraes, Z. J. Sun, W. Guryn, A. M. Vander Molen, W. W. Jacobs, F. Videbæk, M. DePhillips, J. Lauret, G. Webb, E. Hjort, O. G. Grebenyuk, M. S. Daugherity, T. W. Ludlam, Michal Sumbera, Ki-Seok Choi, M. R. Dutta Mazumdar, J. M. Nelson, J. Fedorisin, O. Catu, Rolf K. Reed, J. Sandweiss, R. Lednicky, Yan Li, X. L. Wang, M. S. Ganti, A. G. Knospe, C. Zhong, R. Witt, P. Djawotho, O. V. Rogachevskiy, Jing-Han Chen, W. Peryt, S. W. Wissink, A. Kocoloski, Nikola Poljak, Chitrasen Jena, S. Dash, Y. P. Lu, S. Mioduszewski, V. Yu Khodyrev, W. A. Love, V. Perevoztchikov, K. Kang, D. Tlusty, Mirko Planinic, Sergey Panitkin, B. K. Srivastava, I. M. Vasilevski, S. Bueltmann, M. van Leeuwen, X. Dong, S. K. Pal, Y. N. Gorbunov, Boris Hippolyte, Elena Bruna, Jongmin Lee, R. L. Ray, D. Staszak, T. Ljubicic, H. Caines, Sudhir Raniwala, Xuan Zhang, Jie Liu, Hanna Paulina Zbroszczyk, H. Bichsel, G. Odyniec, D. R. Beavis, Y. Zoulkarneeva, Q. Wang, M. J. Russcher, K. Kajimoto, M. Zawisza, H. M. Spinka, O. I. Mall, J. H. Thomas, Jing Zhou, D. Kettler, G. S. Averichev, Marcelo Gameiro Munhoz, D. J. Prindle, B. V.K.S. Potukuchi, M. A. Lisa, Yu-Gang Ma, B. Erazmus, T. P. Burton, L. Kotchenda, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, D. P. Mahapatra, R. S. Hollis, M. Calderón DeLaBarca Sánchez, Sergey Voloshin, Christine Nattrass, F. Liu, J. Baudot, W. Zhan, Neeraj Gupta, D. Cebra, S. Trentalange, M. Estienne, R. D. Majka, J. Y. Chen, S. Margetis, R. F. Clarke, J. Schambach, Anju Bhasin, R. P. Redwine, S. Q. Zhang, A. Lebedev, M. Botje, Ross Milner, W. Christie, W. M. Zhang, Andrey Vasiliev, Janet Elizabeth Seger, A. M. Hoffman, A. Chikanian, V. N. Tram, D. Arkhipkin, A. Hamed, A. Iordanova, Yuanfang Wu, Basanta Kumar Nandi, B. Biritz, V. A. Okorokov, C. Roy, and P. Chaloupka

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 7. Clean energy, 01 natural sciences, Charged particle, Nuclear physics, Interferometry, Pion, 0103 physical sciences, Quark–gluon plasma, High Energy Physics::Experiment, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Scaling, STAR detector
Abstract

We present a systematic analysis of two-pion interferometry in Au+Au collisions at √sNN=62.4 GeV and Cu+Cu collisions at √sNN=62.4 and 200 GeV using the STAR detector at the Relativistic Heavy Ion Collider (RHIC). The multiplicity and transverse momentum dependences of the extracted correlation lengths (radii) are studied. The scaling with charged particle multiplicity of the apparent system volume at final interaction is studied for the RHIC energy domain. The multiplicity scaling of the measured correlation radii is found to be independent of colliding system and collision energy.

Published
2009

31. Spectra and radial flow in relativistic heavy ion collisions with Tsallis statistics in a blast-wave description

Author

Zebo Tang, Fuqiang Wang, Lijuan Ruan, Zhongbin Xu, Yichun Xu, and Gene Van Buren

Subjects
Nuclear physics, Baryon, Physics, Nuclear and High Energy Physics, Meson, Degree (graph theory), Tsallis statistics, Zero (complex analysis), Non-equilibrium thermodynamics, Nuclear Experiment, Relativistic Heavy Ion Collider, Spectral line
Abstract

We have implemented the Tsallis statistics in a Blast-Wave model (TBW) and applied it to midrapidity transverse-momentum spectra of identified particles measured at BNL Relativistic Heavy Ion Collider (RHIC). This new TBW function fits the RHIC data very well for ${p}_{T}l3$ GeV/$c$. We observed that the collective flow velocity starts from zero in $p+p$ and peripheral $\mathrm{Au}+\mathrm{Au}$ collisions and grows to $0.470\ifmmode\pm\else\textpm\fi{}0.009c$ in central $\mathrm{Au}+\mathrm{Au}$ collisions. The resulting $(q\ensuremath{-}1)$ parameter, which characterizes the degree of nonequilibrium in a system, indicates an evolution from a highly nonequilibrated system in $p+p$ collisions toward an almost thermalized system in central $\mathrm{Au}+\mathrm{Au}$ collisions. The temperature and collective velocity are well described by a quadratic dependence on $(q\ensuremath{-}1)$. Two sets of parameters in our TBW are required to describe the meson and baryon groups separately in $p+p$ collisions while one set appears to fit all spectra in central $\mathrm{Au}+\mathrm{Au}$ collisions.

Published
2009

32. Systematic measurements of identified particle spectra inpp,d+Au, andAu+Aucollisions at the STAR detector

Author

R. Manweiler, Hongfang Liu, H. Z. Huang, S. Vokal, A. M. Poskanzer, J. Engelage, J. Kiryluk, A. Kechechyan, Andre Mischke, M. Krus, R. Cendejas, D. A. Morozov, M. Heinz, Premomoy Ghosh, David Jonathan Hofman, J. M. Landgraf, O. I. Mall, Ermes Braidot, M. Calderon De La Barca Sanchez, O. Catu, Adam Ryszard Kisiel, J. S. Wang, M. Strikhanov, B. Haag, Zebo Tang, B. V.K.S. Potukuchi, H. J. Crawford, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, D. Thein, M. Kopytine, M. Tokarev, T. D. S. Stanislaus, A. Kocoloski, S. Dash, A. Ridiger, H. Caines, Ki-Seok Choi, S. Heppelmann, J. Sandweiss, D. D. Koetke, J. E. Draper, F. Videbæk, M. S. Ganti, Y. P. Lu, Sergei A. Voloshin, V. Perevoztchikov, J. P. Coffin, B. E. Bonner, O. D. Tsai, W. Christie, M. Elnimr, W. M. Zhang, M. C. Cervantes, Andrey Vasiliev, Sevil Salur, A. Stadnik, Peter Martin Jacobs, J. Takahashi, S. B. Nurushev, M. Sharma, V. Fine, Z. Chajecki, C. Perkins, X. L. Wang, C. Zhong, David Lynn, Q. Wang, M. J. Russcher, M. van Leeuwen, X. Dong, H. H. Wieman, M. DePhillips, Michal Sumbera, D. Tlusty, Mirko Planinic, R. Fatemi, Y. Bai, S. W. Wissink, Y. Zhang, Nikola Poljak, Y. N. Gorbunov, L. C. Bland, Yu-Gang Ma, Janet Elizabeth Seger, N. G. Minaev, H. Zhang, K. Krueger, J. A. Vanfossen, S. S. Shi, A. M. Hoffman, Thomas Peitzmann, I. Selyuzhenkov, Z. Xu, G. Lin, J. W. Harris, Anthony R. Timmins, Jing Zhou, W. J. Llope, Sergey Timoshenko, K. Kang, R. L. Ray, D. Staszak, L. Kotchenda, J. Callner, W. He, M. Cherney, Thomas Michael Cormier, P. Yepes, S. Bueltmann, A. H. Tang, I. Sakrejda, Lokesh Kumar, J. H. Thomas, T. Ljubicic, F. Du, M. Sarsour, M. J. Skoby, C. A. Whitten, Feng Jin, A. Chikanian, V. N. Tram, E. Elhalhuli, Rama Narayana Singaraju, J. X. Zuo, Jifa Tian, V. Rykov, T. P. Burton, Bedangadas Mohanty, L. Liu, B. Erazmus, Bernd Surrow, Sudhir Raniwala, W. T. Waggoner, L. V. Nogach, M. J. Ng, M. C. Suarez, E. P. Sichtermann, Pawan Kumar Netrakanti, Jana Bielcikova, Morton Kaplan, S. J. Lindenbaum, F. Liu, Chang-Hwan Lee, Raimond Snellings, L. K. Mangotra, V. I. Kravtsov, P. Djawotho, A. P. Meschanin, J. Balewski, Rashmi Raniwala, Neeraj Gupta, D. Cebra, D. Arkhipkin, A. Hamed, N. Xu, P. Filip, S. LaPointe, Claude Andre Pruneau, Jie Liu, S. Trentalange, Xiangming Sun, G. D. Westfall, C. A. Gagliardi, P. Kurnadi, A. Gordon, M. Estienne, Y. Panebratsev, G. Van Buren, A. Iordanova, R. D. Majka, Petr Jákl, T. Ullrich, Xuan Wang, Zhenyu Zhang, C. Nepali, Hanna Paulina Zbroszczyk, Jorn Henning Putschke, M. Botje, A. Szanto de Toledo, A. Ogawa, R. Zoulkarneev, D. Grosnick, J. Y. Chen, V. Kouchpil, S. Margetis, R. F. Clarke, J. Schambach, Lee Stuart Barnby, H. F. Chen, M. R. Cosentino, J. Kapitan, D. Kettler, D. R. Beavis, W. R. Edwards, Anju Bhasin, A. V. Brandin, S. U. Chung, M. Wada, T. W. Ludlam, H. Okada, L. Eun, Jaroslav Bielcik, S. M. Dogra, C-Q. Li, Marcelo Gameiro Munhoz, D. J. Prindle, J. M. Nelson, S. Q. Zhang, F. Benedosso, A. Lebedev, S. E. Vigdor, J. H. Chen, M. Bystersky, Yan Li, W. Peryt, Christian Claude Kuhn, R. P. Scharenberg, Christina Markert, Yuanfang Wu, M. R. Dutta Mazumdar, T. Pawlak, O. V. Rogachevskiy, M. A. Lisa, H. S. Matis, Basanta Kumar Nandi, T. G. Dedovich, G. S. Averichev, W. A. Love, X. Lin, T. Sakuma, B. Biritz, R. S. Longacre, S. C. Phatak, V. A. Okorokov, W. W. Jacobs, S. M. Guertin, B. Grube, Alexandre Alarcon Do Passo Suaide, Madan M. Aggarwal, Fuqiang Wang, C. Roy, Yong Xu, C. De Silva, J. Lauret, W. Guryn, P. Chaloupka, Debasish Das, Raghunath Sahoo, Frank Simon, O. G. Grebenyuk, Rolf K. Reed, R. Lednicky, L. Molnar, M. A.C. Lamont, J. Fedorisin, K. Kajimoto, G. Igo, D. P. Mahapatra, B. D. Anderson, A. G. Knospe, Russell Richard Betts, D. G. Underwood, Lijuan Ruan, J. Bouchet, M. S. Daugherity, M. Shao, T. J. Hallman, J. Cheng, T. J. M. Symons, R. S. Hollis, J. Millane, I. K. Yoo, Andrew Rose, Y. Zhao, N. K. Pruthi, M. Zawisza, H. M. Spinka, G. Eppley, Xu Cai, J. Pluta, D. R. Gangadharan, E. G. Judd, J. Ulery, H. G. Ritter, O. Barannikova, R. Bellwied, L. Gaillard, M. Pachr, R. E. Tribble, V. Emelianov, A. K. Bhati, D. Keane, Gerald W Hoffmann, Nikolai Smirnov, J. Mitchell, L. G. Efimov, T. K. Nayak, Christine Nattrass, Subhasis Chattopadhyay, M. L. Miller, Elena Bruna, Guo-Liang Ma, A. S. Hirsch, J. C. Webb, P. Kravtsov, J. Sowinski, G. Wang, P. Seyboth, E. J. Garcia-Solis, R. Witt, R. Derradi de Souza, B. I. Abelev, S. Mioduszewski, V. Yu Khodyrev, J. Baudot, W. Zhan, Yanchu Wang, Subrata Pal, B. K. Srivastava, I. M. Vasilevski, M. J. M. Codrington, A. Gupta, S. Bhardwaj, Boris Hippolyte, A. Shabetai, T. S. McShane, J. C. Dunlop, Q. H. Xu, Zubayer Ahammed, Z. J. Sun, M. J. LeVine, J. Joseph, G. M.S. Vasconcelos, Y. Pandit, S. Baumgart, N. Schmitz, E. Shahaliev, J. L. Drachenberg, V. Ghazikhanian, A. Feng, Marek Bombara, J. L. Romero, Jay Roberts, Y. Fisyak, E. Finch, A. M. Vander Molen, E. Hjort, Thomas Humanic, P. Sorensen, Y. J. Sun, X. H. Shi, Peter Graham Jones, L. Didenko, S. Kabana, Y. P. Viyogi, S. R. Klein, T. Tarnowsky, N. L. Subba, D. L. Olson, A. A. Derevschikov, A. L. Trattner, J. G. Cramer, P. Fachini, K. S.F.F. Guimaraes, Qian Yue, R. Varma, Yu A. Matulenko, B. S. Page, and B. Stringfellow

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Strangeness production, Strangeness, Kinetic energy, 01 natural sciences, 7. Clean energy, Charged particle, Hadronization, Nuclear physics, Baryon, 13. Climate action, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

Identified charged-particle spectra of pi(+/-), K(+/-), p, and (p) over bar at midrapidity (vertical bar y vertical bar < 0.1) measured by the dE/dx method in the STAR (solenoidal tracker at the BNL Relativistic Heavy Ion Collider) time projection chamber are reported for pp and d + Au collisions at root s(NN) = 200 GeV and for Au + Au collisions at 62.4, 130, and 200 GeV. Average transverse momenta, total particle production, particle yield ratios, strangeness, and baryon production rates are investigated as a function of the collision system and centrality. The transverse momentum spectra are found to be flatter for heavy particles than for light particles in all collision systems; the effect is more prominent for more central collisions. The extracted average transverse momentum of each particle species follows a trend determined by the total charged-particle multiplicity density. The Bjorken energy density estimate is at least several GeV/fm(3) for a formation time less than 1 fm/c. A significantly larger net-baryon density and a stronger increase of the net-baryon density with centrality are found in Au + Au collisions at 62.4 GeV than at the two higher energies. Antibaryon production relative to total particle multiplicity is found to be constant over centrality, but increases with the collision energy. Strangeness production relative to total particle multiplicity is similar at the three measured RHIC energies. Relative strangeness production increases quickly with centrality in peripheral Au + Au collisions, to a value about 50% above the pp value, and remains rather constant in more central collisions. Bulk freeze-out properties are extracted from thermal equilibrium model and hydrodynamics-motivated blast-wave model fits to the data. Resonance decays are found to have little effect on the extracted kinetic freeze-out parameters because of the transverse momentum range of our measurements. The extracted chemical freeze-out temperature is constant, independent of collision system or centrality; its value is close to the predicted phase-transition temperature, suggesting that chemical freeze-out happens in the vicinity of hadronization and the chemical freeze-out temperature is universal despite the vastly different initial conditions in the collision systems. The extracted kinetic freeze-out temperature, while similar to the chemical freeze-out temperature in pp, d + Au, and peripheral Au + Au collisions, drops significantly with centrality in Au + Au collisions, whereas the extracted transverse radial flow velocity increases rapidly with centrality. There appears to be a prolonged period of particle elastic scatterings from chemical to kinetic freeze-out in central Au + Au collisions. The bulk properties extracted at chemical and kinetic freeze-out are observed to evolve smoothly over the measured energy range, collision systems, and collision centralities.

Published
2009

33. Observation of Two-Source Interference in the Photoproduction Reaction AuAu -> AuAu rho(0)

Author

R. P. Redwine, Raimond Snellings, Xiangming Sun, C. Li, B. Erazmus, S. Q. Zhang, A. Lebedev, B. D. Anderson, N. K. Pruthi, Guo-Liang Ma, J. Ulery, G. Eppley, B. Haag, J. Pluta, I. Selyuzhenkov, M. Botje, M. Pachr, Vitaly Okorokov, R. E. Tribble, A. Szanto de Toledo, Gerald W Hoffmann, M. Calderon De La Barca Sanchez, H. G. Ritter, D. Tlusty, Mirko Planinic, Ross Milner, Neeraj Gupta, D. Cebra, J. Engelage, Y. Fisyak, J. Kapitan, A. Chikanian, S. M. Dogra, Zebo Tang, V. N. Tram, C. Nepali, L. Kotchenda, O. Catu, S. Trentalange, Jorn Henning Putschke, O. Barannikova, R. Bellwied, V. Fine, L. Gaillard, A. S. Hirsch, J. C. Webb, L. K. Mangotra, T. Pawlak, A. Kocoloski, M. Estienne, H. Z. Huang, S. Vokal, N. Xu, P. Filip, A. V. Brandin, Bernd Surrow, E. P. Sichtermann, H. Okada, L. C. Bland, A. M. Vander Molen, S. Dash, Z. Chajecki, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, R. Manweiler, R. Witt, R. Fatemi, Michael Joseph Betancourt, E. Hjort, Hongfang Liu, B. Grube, M. DePhillips, Michal Sumbera, K. Krueger, D. Arkhipkin, A. Hamed, P. Kravtsov, Sergey Voloshin, Christine Nattrass, Y. Bai, Y. N. Gorbunov, C. Perkins, A. M. Poskanzer, G. D. Westfall, David Jonathan Hofman, Pawan Kumar Netrakanti, J. W. Harris, L. Liu, C. L. Jones, S. Mioduszewski, Premomoy Ghosh, J. M. Landgraf, David Lynn, Q. Wang, M. J. Russcher, J. H. Thomas, D. Kettler, M. Strikhanov, J. A. Vanfossen, J. Balewski, A. Iordanova, S. E. Vigdor, Christian Claude Kuhn, M. C. Suarez, Sergey Timoshenko, S. W. Wissink, Rashmi Raniwala, Claude Andre Pruneau, F. Liu, Petr Jákl, J. Sowinski, Y. Zhang, V. Yu Khodyrev, T. Peitzmann, A. Kechechyan, Andre Mischke, C. A. Gagliardi, J. Kiryluk, C. Roy, Nikola Poljak, Ki-Seok Choi, Z. Xu, G. Lin, G. S. Averichev, W. Guryn, T. Ullrich, J. Callner, Anthony R. Timmins, R. N. Singaraju, B. K. Srivastava, A. Stadnik, Peter Martin Jacobs, J. Sandweiss, I. M. Vasilevski, S. Bueltmann, Anik Gupta, M. Krus, R. Cendejas, A. P. Meschanin, W. He, O. G. Grebenyuk, R. Zoulkarneev, S. M. Guertin, D. A. Morozov, P. Yepes, V. Emelianov, A. K. Bhati, M. Heinz, Lee Stuart Barnby, D. Keane, M. Cherney, J. Fedorisin, Alexandre Alarcon Do Passo Suaide, D. Thein, Thomas Michael Cormier, A. H. Tang, H. Zhang, Jaroslav Bielcik, Jing Zhou, M. J. Skoby, K. Kajimoto, J. Baudot, W. Zhan, L. Eun, Lokesh Kumar, A. G. Knospe, E. Elhalhuli, R. D. Majka, C. De Silva, A. Ridiger, D. P. Mahapatra, Wei Xie, S. Bhardwaj, Nikolai Smirnov, M. S. Daugherity, M. Sarsour, Russell Richard Betts, R. L. Ray, R. S. Hollis, Jifa Tian, J. Takahashi, Xuan Wang, J. Joseph, Boris Hippolyte, J. Y. Chen, I. Sakrejda, A. Ogawa, J. L. Drachenberg, S. Margetis, R. F. Clarke, J. Schambach, J. Mitchell, K. Kang, L. G. Efimov, Elena Bruna, M. R. Dutta Mazumdar, D. G. Underwood, T. P. Burton, D. Staszak, G. M.S. Vasconcelos, M. Kopytine, S. Heppelmann, H. F. Chen, Thomas A. Trainor, W. R. Edwards, S. U. Chung, I. K. Yoo, S. S. Shi, Marcelo Gameiro Munhoz, D. J. Prindle, O. V. Rogachevskiy, S. B. Nurushev, W. Christie, Lijuan Ruan, M. Tokarev, T. Ljubicic, W. T. Waggoner, P. Chaloupka, R. S. Longacre, Y. Pandit, C-H. Lee, T. K. Nayak, M. Sharma, J. X. Zuo, W. M. Zhang, Andrey Vasiliev, H. Caines, Sudhir Raniwala, N. Schmitz, R. P. Scharenberg, Christina Markert, M. Zawisza, H. M. Spinka, A. Feng, M. Shao, D. D. Koetke, W. A. Love, E. Shahaliev, H. S. Matis, F. Du, Debasish Das, Raghunath Sahoo, D. R. Gangadharan, N. G. Minaev, T. J. Hallman, J. Cheng, T. J. M. Symons, Jay Roberts, Janet Elizabeth Seger, J. E. Draper, A. M. Hoffman, E. G. Judd, M. A.C. Lamont, V. Rykov, L. V. Nogach, G. Igo, V. Ghazikhanian, T. D. S. Stanislaus, W. W. Jacobs, M. A. Lisa, M. J. Ng, Y. Panebratsev, D. Grosnick, V. Kouchpil, V. I. Kravtsov, Yuanfang Wu, X. L. Wang, J. Bouchet, S. LaPointe, N. Li, J. P. Coffin, C. Zhong, J. Lauret, F. Videbæk, Bedangadas Mohanty, H. H. Wieman, P. Kurnadi, Marek Bombara, A. Gordon, R. Lednicky, P. Djawotho, Yinina Ma, M. van Leeuwen, X. Dong, Madan M. Aggarwal, Sukalyan Chattopadhyay, Fuqiang Wang, Zhenyu Zhang, M. R. Cosentino, J. L. Romero, S. K. Pal, Basanta Kumar Nandi, C. A. Whitten, Feng Jin, Andrew Rose, M. S. Ganti, Rolf K. Reed, B. Biritz, M. Wada, Y. Zhao, J. H. Chen, M. Bystersky, R. Corliss, Ermes Braidot, J. S. Wang, Yong Xu, Morton Kaplan, F. Benedosso, B. E. Bonner, X. Z. Cai, O. D. Tsai, J. C. Dunlop, E. Finch, S. J. Lindenbaum, Adam Ryszard Kisiel, M. Elnimr, M. C. Cervantes, Y. P. Lu, V. Perevoztchikov, G. Van Buren, H. J. Crawford, Zubayer Ahammed, M. J. LeVine, P. Fachini, K. S.F.F. Guimaraes, T. G. Dedovich, T. W. Ludlam, J. M. Nelson, Frank Simon, T. Sakuma, William Axel Leight, S. C. Phatak, Sevil Salur, Y. Wang, Yan Li, W. Peryt, G. Wang, S. R. Klein, T. Tarnowsky, N. L. Subba, P. Seyboth, E. J. Garcia-Solis, D. L. Olson, R. Derradi de Souza, B. I. Abelev, A. A. Derevschikov, A. L. Trattner, M. J. M. Codrington, Jana Bielcikova, A. Shabetai, J. G. Cramer, P. Sorensen, X. H. Shi, Q. H. Xu, Z. J. Sun, Peter Graham Jones, L. Didenko, T. S. McShane, S. Baumgart, Matthew Walker, Y. J. Sun, S. Kabana, Y. P. Viyogi, T. J. Humanic, O. I. Mall, Qian Yue, R. Varma, Yu A. Matulenko, B. S. Page, D. P. Kikola, B. Stringfellow, B. V.K.S. Potukuchi, W. J. Llope, Jie Liu, Hanna Paulina Zbroszczyk, D. R. Beavis, and Anju Bhasin

Subjects
Particle physics, Photon, Quantum decoherence, Nuclear Theory, General Physics and Astronomy, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, Colliders, 010306 general physics, Wave function, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Heavy-Ion Collisions, NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika, Amplitude, Time Projection Chamber, High Energy Physics::Experiment, Impact parameter, Wave function collapse, Nucleon, ultra-peripheral relativistic heavy-ion collisions
Abstract

In ultra-peripheral relativistic heavy-ion collisions, a photon from the electromagnetic field of one nucleus can fluctuate to a quark-antiquark pair and scatter from the other nucleus, emerging as a $\rho^0$. The $\rho^0$ production occurs in two well-separated (median impact parameters of 20 and 40 fermi for the cases considered here) nuclei, so the system forms a 2-source interferometer. At low transverse momenta, the two amplitudes interfere destructively, suppressing $\rho^0$ production. Since the $\rho^0$ decay before the production amplitudes from the two sources can overlap, the two-pion system can only be described with an entangled non-local wave function, and is thus an example of the Einstein-Podolsky-Rosen paradox. We observe this suppression in 200 GeV per nucleon-pair gold-gold collisions. The interference is $87% \pm 5% {; ; \rm (stat.)}; ; \pm 8%$ (syst.) of the expected level. This translates into a limit on decoherence due to wave function collapse or other factors, of 23% at the 90% confidence level.

Published
2009

34. Indications of Conical Emission of Charged Hadrons at the BNL Relativistic Heavy Ion Collider

Author

Jaroslav Bielcik, Russell Richard Betts, M. R. Dutta Mazumdar, D. G. Underwood, M. DePhillips, O. V. Rogachevskiy, Lijuan Ruan, Michal Sumbera, W. A. Love, M. Shao, J. S. Wang, P. Kurnadi, T. J. Hallman, J. Cheng, T. J. M. Symons, Zhenyu Zhang, M. R. Cosentino, Y. Bai, A. Ridiger, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, O. I. Mall, F. Benedosso, C-Q. Li, B. Grube, S. Heppelmann, J. L. Drachenberg, S. W. Wissink, Y. Zhang, N. Xu, P. Filip, T. G. Dedovich, David Lynn, Nikola Poljak, W. Guryn, H. Zhang, R. P. Scharenberg, Christina Markert, H. S. Matis, F. Liu, L. Kotchenda, T. Sakuma, S. C. Phatak, D. D. Koetke, J. E. Draper, R. D. Majka, S. Margetis, R. F. Clarke, J. Schambach, I. Sakrejda, G. D. Westfall, W. W. Jacobs, J. Lauret, A. Feng, Q. Wang, M. J. Russcher, Madan M. Aggarwal, Fuqiang Wang, O. G. Grebenyuk, R. Lednicky, L. Molnar, Jay Roberts, J. X. Zuo, F. Videbæk, J. Fedorisin, V. Fine, B. V.K.S. Potukuchi, Yu-Gang Ma, Petr Jákl, W. Christie, W. M. Zhang, Andrey Vasiliev, Yong Xu, S. LaPointe, A. Gordon, A. G. Knospe, E. P. Sichtermann, Raimond Snellings, Xiangming Sun, C. Nepali, Jing Zhou, Sergey Timoshenko, Jorn Henning Putschke, G. Wang, Jake Y. Chen, J. P. Coffin, A. V. Brandin, I. K. Yoo, Janet Elizabeth Seger, A. M. Hoffman, Anju Bhasin, S. Q. Zhang, A. Lebedev, M. M. de Moura, M. Botje, Frank Simon, H. Okada, W. J. Llope, J. Balewski, Rashmi Raniwala, Claude Andre Pruneau, B. Erazmus, S. E. Vigdor, Christian Claude Kuhn, I. Selyuzhenkov, A. Szanto de Toledo, J. Kapitan, J. Engelage, T. Ullrich, S. M. Dogra, Bernd Surrow, Xuan Wang, Neeraj Gupta, D. Cebra, S. Trentalange, M. Estienne, R. Zoulkarneev, H. Z. Huang, S. Vokal, A. Ogawa, B. E. Bonner, H. F. Chen, P. Seyboth, E. J. Garcia-Solis, T. Pawlak, Pawan Kumar Netrakanti, Thomas A. Trainor, W. R. Edwards, O. D. Tsai, L. Eun, C. A. Whitten, Feng Jin, A. Chikanian, M. S. Ganti, B. D. Anderson, D. R. Gangadharan, E. G. Judd, D. Tlusty, Mirko Planinic, K. Kajimoto, X. Lin, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, S. Chattopadhyay, F. Du, C. A. Gagliardi, Jie Liu, Premomoy Ghosh, J. M. Landgraf, V. N. Tram, R. Witt, S. Mioduszewski, V. Yu Khodyrev, Subrata Pal, V. Rykov, J. Kiryluk, J. H. Chen, L. V. Nogach, M. Elnimr, M. C. Cervantes, M. J. Ng, D. P. Mahapatra, X. L. Wang, R. S. Hollis, Bedangadas Mohanty, C. Zhong, S. U. Chung, N. K. Pruthi, Y. N. Gorbunov, Hanna Paulina Zbroszczyk, D. R. Beavis, M. Strikhanov, V. I. Kravtsov, B. K. Srivastava, I. M. Vasilevski, R. Derradi de Souza, B. I. Abelev, Marcelo Gameiro Munhoz, D. J. Prindle, S. J. Lindenbaum, M. van Leeuwen, X. Dong, Ki-Seok Choi, J. W. Harris, Y. P. Lu, V. Perevoztchikov, S. Bhardwaj, D. A. Morozov, M. Wada, J. Sandweiss, Jana Bielcikova, J. G. Cramer, M. Bystersky, Boris Hippolyte, M. A. Lisa, Anthony R. Timmins, J. C. Dunlop, Sergey Voloshin, Christine Nattrass, P. Yepes, D. Arkhipkin, A. Hamed, R. L. Ray, S. Bueltmann, M. Sharma, A. H. Tang, Zubayer Ahammed, D. Staszak, K. Kang, A. M. Vander Molen, T. Ljubicic, M. J. LeVine, M. Zawisza, H. M. Spinka, G. Eppley, H. Caines, Sudhir Raniwala, M. J. M. Codrington, A. Iordanova, N. G. Minaev, J. Baudot, W. Zhan, E. Hjort, Y. F. Wu, Sevil Salur, Y. Wang, P. Sorensen, X. H. Shi, M. Calderon De La Barca Sanchez, O. Catu, J. Pluta, T. P. Burton, Y. Fisyak, P. Djawotho, A. Kocoloski, Peter Graham Jones, T. S. McShane, A. Shabetai, M. Pachr, R. E. Tribble, S. Dash, J. H. Thomas, Q. H. Xu, V. Emelianov, A. K. Bhati, D. Keane, Z. J. Sun, Gerald W Hoffmann, M. L. Miller, Basanta Kumar Nandi, Nikolai Smirnov, J. Mitchell, L. G. Efimov, D. Kettler, Elena Bruna, S. Baumgart, G. S. Averichev, C-H. Lee, T. K. Nayak, L. Didenko, Guo-Liang Ma, B. Biritz, V. A. Okorokov, Y. Panebratsev, S. R. Klein, D. Grosnick, T. Tarnowsky, N. L. Subba, A. S. Hirsch, D. L. Olson, Y. J. Sun, J. C. Webb, V. Kouchpil, P. Kravtsov, Rolf K. Reed, C. Roy, A. A. Derevschikov, A. L. Trattner, J. Sowinski, S. Kabana, Y. P. Viyogi, T. J. Humanic, J. Joseph, G. M.S. Vasconcelos, C. De Silva, Qian Yue, P. Chaloupka, R. Varma, Y. Pandit, N. Schmitz, Yu A. Matulenko, B. S. Page, B. Stringfellow, E. Shahaliev, V. Ghazikhanian, D. Thein, M. Kopytine, M. Tokarev, Marek Bombara, J. L. Romero, T. D. S. Stanislaus, H. H. Wieman, L. K. Mangotra, R. Manweiler, Hongfang Liu, E. Finch, A. M. Poskanzer, A. Kechechyan, Andre Mischke, M. Krus, R. Cendejas, R. S. Longacre, Debasish Das, Raghunath Sahoo, M. A.C. Lamont, G. Igo, J. Bouchet, J. Millane, Andrew Rose, Y. Zhao, G. Van Buren, S. S. Shi, T. W. Ludlam, J. M. Nelson, Yan Li, W. Peryt, R. N. Singaraju, A. P. Meschanin, J. Ulery, H. G. Ritter, O. Barannikova, R. Bellwied, L. Gaillard, M. S. Daugherity, L. C. Bland, L. Liu, M. C. Suarez, Morton Kaplan, X. Z. Cai, David Jonathan Hofman, A. Stadnik, Peter Martin Jacobs, J. Takahashi, S. B. Nurushev, B. Haag, Zebo Tang, Z. Chajecki, C. Perkins, T. Peitzmann, Z. Xu, G. Lin, Anik Gupta, M. J. Skoby, E. Elhalhuli, Jifa Tian, W. T. Waggoner, R. Fatemi, P. Fachini, K. Krueger, J. A. Vanfossen, K. S.F.F. Guimaraes, J. Callner, W. He, M. Cherney, Thomas Michael Cormier, Lokesh Kumar, M. Sarsour, Ermes Braidot, Adam Ryszard Kisiel, H. J. Crawford, M. Heinz, and Lee Stuart Barnby

Subjects
Nuclear Theory, Events, Hadron, FOS: Physical sciences, General Physics and Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Nuclear Theory (nucl-th), Nuclear physics, Plasma, 0103 physical sciences, Perpendicular, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, plasma, Astrophysics::Galaxy Astrophysics, Physics, 010308 nuclear & particles physics, Conical surface, NATURAL SCIENCES. Physics, 3. Good health, PRIRODNE ZNANOSTI. Fizika, Deuterium, Transverse momentum, Particle, High Energy Physics::Experiment, Atomic physics, Relativistic Heavy Ion Collider, events, conical emission of correlated charged hadrons
Abstract

Three-particle azimuthal correlation measurements with a high transverse momentum trigger particle are reported for pp, d+Au, and Au+Au collisions at 200 GeV by the STAR experiment. Dijet structures are observed in pp, d+Au and peripheral Au+Au collisions. An additional structure is observed in central Au+Au data, signaling conical emission of correlated charged hadrons. The conical emission angle is found to be 1.37 +- 0.02(stat) +0.06-0.07(syst), independent of pt., 7 pages, 4 figures, 1 table

Published
2009

35. System size dependence of associated yields in hadron-triggered jets

Author

F. Videbæk, B. Grube, A. Feng, G. Webb, O. I. Mall, Q. H. Xu, Jay Roberts, A. Ridiger, A. Chikanian, V. N. Tram, W. Guryn, D. Arkhipkin, A. Hamed, Y. Panebratsev, A. Iordanova, D. Grosnick, V. Kouchpil, D. Thein, R. N. Singaraju, L. Huo, A. P. Meschanin, Jorn Henning Putschke, A. V. Brandin, H. Okada, T. S. McShane, M. S. Ganti, M. Kopytine, M. Tokarev, S. E. Vigdor, C. Roy, B. V.K.S. Potukuchi, Yi Zhang, M. Calderon De La Barca Sanchez, O. Catu, Madan M. Aggarwal, W. Christie, P. R. Pujahari, T. P. Burton, P. Chaloupka, A. Shabetai, Chitrasen Jena, Raimond Snellings, Christian Claude Kuhn, X. L. Wang, J. Engelage, S. Heppelmann, Yu-Gang Ma, Rolf K. Reed, O. G. Grebenyuk, L. Kotchenda, W. M. Zhang, A. Kocoloski, J. C. Dunlop, Y. P. Lu, M. Cherney, Xiangming Sun, V. Perevoztchikov, Basanta Kumar Nandi, S. Zhang, B. Biritz, V. Ghazikhanian, S. Dash, R. Fatemi, Michael Joseph Betancourt, V. A. Okorokov, T. D. S. Stanislaus, J. Fedorisin, B. Haag, Xuan Zhang, M. van Leeuwen, X. Dong, Jie Liu, Andrey Vasiliev, A. G. Knospe, K. Krueger, A. Geromitsos, F. Du, D. D. Koetke, J. E. Draper, H. H. Wieman, J. Ulery, H. G. Ritter, J. A. Vanfossen, S. Baumgart, Fuqiang Wang, S. K. Pal, Hanna Paulina Zbroszczyk, Premomoy Ghosh, J. M. Landgraf, D. Tlusty, Mirko Planinic, L. K. Mangotra, P. Sorensen, X. H. Shi, O. Barannikova, R. Bellwied, D. R. Beavis, Janet Elizabeth Seger, Russell Richard Betts, L. V. Nogach, M. J. Ng, R. S. Longacre, I. Sakrejda, S. Bueltmann, Matthew Walker, A. M. Hoffman, D. G. Underwood, M. Strikhanov, Lijuan Ruan, E. P. Sichtermann, V. I. Kravtsov, Y. N. Gorbunov, Zebo Tang, R. Manweiler, Peter Graham Jones, Yong Xu, Zubayer Ahammed, M. J. LeVine, L. Gaillard, L. C. Bland, Sergey Voloshin, J. X. Zuo, V. Emelianov, D. Keane, W. He, Bedangadas Mohanty, J. Balewski, Marek Bombara, J. L. Romero, A. M. Poskanzer, Christine Nattrass, Ki-Seok Choi, M. Shao, Rashmi Raniwala, P. Kurnadi, Nikolai Smirnov, J. Mitchell, W. J. Llope, Claude Andre Pruneau, L. G. Efimov, S. M. Guertin, E. Finch, Thomas Michael Cormier, H. Z. Huang, S. Vokal, Debasish Das, Raghunath Sahoo, B. D. Anderson, J. Sandweiss, Y. J. Sun, Lokesh Kumar, F. Liu, Elena Bruna, T. J. Hallman, J. Cheng, Zhenyu Zhang, Z. Chajecki, Y. Yang, Alexandre Alarcon Do Passo Suaide, S. LaPointe, N. Li, S. Chattopadhyay, C-H. Lee, T. K. Nayak, A. Kechechyan, Andre Mischke, T. J. M. Symons, L. Didenko, L. Liu, C. L. Jones, B. E. Bonner, M. A.C. Lamont, M. R. Cosentino, A. Gordon, Z. J. Sun, O. D. Tsai, J. Baudot, M. C. Suarez, S. Kabana, T. Ullrich, D. P. Mahapatra, C-Q. Li, M. Elnimr, M. Krus, G. Igo, M. Wada, R. Cendejas, Guo-Liang Ma, M. Sharma, N. K. Pruthi, M. C. Cervantes, C. Perkins, R. S. Hollis, Y. P. Viyogi, R. Zoulkarneev, J. S. Wang, A. M. Vander Molen, R. D. Majka, K. Kang, F. Benedosso, J. Bouchet, J. Bielcikova, T. Peitzmann, R. P. Scharenberg, Christina Markert, E. Hjort, H. S. Matis, M. Bystersky, Y. F. Wu, William Axel Leight, G. Eppley, Z. Xu, G. Lin, S. Margetis, A. S. Hirsch, J. C. Webb, P. Kravtsov, R. F. Clarke, J. Schambach, S. R. Klein, T. Tarnowsky, N. L. Subba, Anju Bhasin, J. Kiryluk, W. L. Zhan, L. Eun, Anik Gupta, R. Witt, M. DePhillips, Andrew Rose, Y. Zhao, J. Pluta, R. P. Redwine, D. L. Olson, A. K. Bhati, Sevil Salur, Y. Wang, A. Lebedev, J. Sowinski, Jongmin Lee, R. L. Ray, W. W. Jacobs, Michal Sumbera, M. J. Skoby, Frank Jm Geurts, J. Lauret, E. Elhalhuli, J. G. Cramer, T. G. Dedovich, Ermes Braidot, M. Botje, D. Staszak, M. S. Daugherity, A. A. Derevschikov, A. L. Trattner, T. Sakuma, S. C. Phatak, M. Pachr, D. A. Morozov, R. E. Tribble, Jifa Tian, T. Ljubicic, X. Cai, Ross Milner, S. Mioduszewski, V. Yu Khodyrev, R. Lednicky, P. Djawotho, Adam Ryszard Kisiel, H. Caines, Sudhir Raniwala, J. W. Harris, V. Fine, Wei Xie, Gerald W Hoffmann, W. T. Waggoner, J. Joseph, H. J. Crawford, G. M.S. Vasconcelos, Y. Fisyak, M. Sarsour, Sergey Timoshenko, Frank Simon, S. W. Wissink, Jake Y. Chen, Y. Pandit, N. Schmitz, T. J. Humanic, Wolfgang Korsch, P. Fachini, K. S.F.F. Guimaraes, E. Shahaliev, G. Van Buren, Qian Yue, Anthony R. Timmins, B. K. Srivastava, I. M. Vasilevski, R. Varma, Yu A. Matulenko, B. S. Page, Nikola Poljak, G. Wang, A. Ogawa, H. F. Chen, P. Yepes, Thomas A. Trainor, W. R. Edwards, D. P. Kikola, P. Seyboth, E. J. Garcia-Solis, S. S. Shi, B. Stringfellow, A. H. Tang, N. G. Minaev, T. W. Ludlam, J. M. Nelson, R. Derradi de Souza, B. I. Abelev, Xiong Wang, Yan Li, M. J. M. Codrington, Jing-Han Chen, W. Peryt, Boris Hippolyte, M. Heinz, David Jonathan Hofman, A. Stadnik, Peter Martin Jacobs, J. Takahashi, Lee Stuart Barnby, N. Xu, P. Filip, S. B. Nurushev, Jaroslav Bielcik, G. D. Westfall, I. K. Yoo, Petr Jákl, M. R. Dutta Mazumdar, O. V. Rogachevskiy, D. R. Gangadharan, E. G. Judd, W. A. Love, C. A. Whitten, Feng Jin, R. Corliss, S. J. Lindenbaum, I. Selyuzhenkov, Bernd Surrow, Pawan Kumar Netrakanti, C. A. Gagliardi, Marcelo Gameiro Munhoz, D. J. Prindle, M. A. Lisa, J. H. Thomas, B. Erazmus, Neeraj Gupta, D. Cebra, S. Trentalange, M. Estienne, D. Kettler, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, C. Zhong, Q. Wang, M. J. Russcher, Jing Zhou, G. S. Averichev, K. Kajimoto, M. Zawisza, H. M. Spinka, L. C. De Silva, A. Szanto de Toledo, J. Kapitan, S. M. Dogra, T. Pawlak, J. L. Drachenberg, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), STAR, and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
heavy ion, scattering, fragmentation, Nuclear and High Energy Physics, di-hadron fragmentation function, Hadron, chemistry.chemical_element, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Jet quenching, Nuclear Experiment, Size dependence, Physics, Quantitative Biology::Neurons and Cognition, 010308 nuclear & particles physics, Angular distance, Copper, parton energy loss, 25.75.-q, 25.75.Gz, jet quenching, Deuterium, chemistry, Transverse momentum, relativistic heavy-ion collisions
Abstract

We present results on the system size dependence of high transverse momentum di-hadron correlations at $\sqrt{s_{NN}}$ = 200 GeV as measured by STAR at RHIC. Measurements in d+Au, Cu+Cu and Au+Au collisions reveal similar jet-like correlation yields at small angular separation ($\Delta\phi\sim0$, $\Delta\eta\sim0$) for all systems and centralities. Previous measurements have shown that the away-side yield is suppressed in heavy-ion collisions. We present measurements of the away-side suppression as a function of transverse momentum and centrality in Cu+Cu and Au+Au collisions. The suppression is found to be similar in Cu+Cu and Au+Au collisions at a similar number of participants. The results are compared to theoretical calculations based on the parton quenching model and the modified fragmentation model. The observed differences between data and theory indicate that the correlated yields presented here will provide important constraints on medium density profile and energy loss model parameters., Comment: 12 pages, 5 figures

Published
2009
Full Text
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36. Forward Neutral-Pion Transverse Single-Spin Asymmetries inp+pCollisions ats=200 GeV

Author

A. I. Pavlinov, B. E. Bonner, F. Liu, A. Ridiger, J. Engelage, M. L. Miller, Thorsten Sven Kollegger, O. D. Tsai, L. K. Mangotra, R. Manweiler, S. Heppelmann, M. C. Cervantes, Hong Liu, Kyungeon Choi, L. Kotchenda, Premomoy Ghosh, T. Dietel, Mirko Planinic, J. Tatarowicz, I. Selyuzhenkov, G. Van Buren, J. M. Landgraf, M. Heinz, Lee Stuart Barnby, Jaroslav Bielcik, Sergey Voloshin, Christine Nattrass, A. M. Poskanzer, X. L. Wang, R. D. Majka, M. Strikhanov, Y. N. Gorbunov, G. Wang, P. Seyboth, E. J. Garcia-Solis, B. Haag, B. Grube, D. D. Koetke, S. L. Blyth, G. M.S. Vasconcelos, M. R. Dutta Mazumdar, J. E. Draper, S. Margetis, R. F. Clarke, J. Schambach, N. Schmitz, T. J. Humanic, E. Shahaliev, T. W. Ludlam, H. Zhang, O. V. Rogachevskiy, Zebo Tang, R. Derradi de Souza, B. I. Abelev, F. Videbæk, W. Guryn, A. Kechechyan, Andre Mischke, J. Sandweiss, J. Baudot, W. Zhan, M. Wada, A. M. Vander Molen, E. Hjort, Y. F. Wu, Gregory Rakness, I. A. Qattan, Z. Chajecki, J. M. Nelson, M. van Leeuwen, X. Dong, Bedangadas Mohanty, W. A. Love, J. P. Coffin, Sukalyan Chattopadhyay, O. G. Grebenyuk, B. Erazmus, W. Christie, V. Ghazikhanian, Sevil Salur, Y. Wang, Yan Li, W. Peryt, S. K. Pal, T. W. Henry, C-Q. Li, Marek Bombara, H. Z. Huang, J. L. Romero, M. S. Ganti, S. Vokal, J. Langdon, Jie Liu, T. P. Burton, D. Thein, E. Finch, R. P. Scharenberg, Christina Markert, M. J. M. Codrington, C. Perkins, W. M. Zhang, Bernd Surrow, E. P. Sichtermann, Andrey Vasiliev, H. S. Matis, M. Kopytine, J. Fu, T. Peitzmann, M. Tokarev, K. Kang, P. Djawotho, I. Sakrejda, W. W. Jacobs, D. Cebra, J. Lauret, J. Kiryluk, Pawan Kumar Netrakanti, Z. Xu, G. Lin, K. Kajimoto, M. Bystersky, J. Balewski, Rashmi Raniwala, D. R. Beavis, Claude Andre Pruneau, M. Calderon De La Barca Sanchez, A. Shabetai, R. Lednicky, M. J. Horner, S. Trentalange, M. Estienne, Y. P. Lu, J. H. Chen, C. A. Gagliardi, O. Catu, Janet Elizabeth Seger, N. van der Kolk, C. Miller, J. X. Zuo, T. D. S. Stanislaus, A. M. Hoffman, H. H. Wieman, V. Perevoztchikov, N. T. Porile, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, D. A. Morozov, Sergey Timoshenko, Jianhong Wu, Madan M. Aggarwal, Fuqiang Wang, R. Fatemi, E. W. Hughes, Morton Kaplan, A. Kocoloski, T. Ullrich, Q. H. Xu, Anju Bhasin, Z. J. Sun, R. Zoulkarneev, X. Z. Cai, Q. Li, E. Elhalhuli, V. Emelianov, A. K. Bhati, D. Keane, S. Dash, K. L. Kowalik, D. P. Mahapatra, H. Bichsel, K. Krueger, J. L. Drachenberg, G. Odyniec, Y. Zoulkarneeva, C. Zhong, Jifa Tian, S. LaPointe, Nikolai Smirnov, R. Stock, J. Mitchell, L. G. Efimov, Qian Yue, L. Eun, A. Lebedev, David Jonathan Hofman, R. S. Hollis, J. W. Harris, Xuan Wang, A. Ogawa, H. F. Chen, W. J. Llope, A. Gordon, Frank Simon, M. Potekhin, C. Nepali, Thomas A. Trainor, W. R. Edwards, C-H. Lee, T. K. Nayak, M. M. de Moura, A. Stadnik, W. T. Waggoner, R. L. Ray, Jorn Henning Putschke, Guo-Liang Ma, A. V. Brandin, Anthony R. Timmins, Peter Martin Jacobs, M. Botje, H. Okada, David Lynn, P. Yepes, Q. Wang, M. J. Russcher, D. Staszak, C. A. Whitten, Feng Jin, Y. Fisyak, S. Bueltmann, I. K. Yoo, Renaud Vernet, J. Takahashi, A. H. Tang, Y. Panebratsev, D. Grosnick, S. E. Vigdor, T. Ljubicic, N. Gupta, A. Feng, Christian Claude Kuhn, V. Kouchpil, S. B. Nurushev, H. Caines, Sudhir Raniwala, A. S. Hirsch, J. C. Webb, D. Relyea, S. Lange, P. Kravtsov, J. H. Thomas, S. J. Lindenbaum, J. S. Wang, J. Callner, J. G. Ma, Jing Zhou, Jay Roberts, P. Fachini, J. Sowinski, K. S.F.F. Guimaraes, S. U. Chung, D. Kettler, E. G. Judd, B. V.K.S. Potukuchi, Yu-Gang Ma, W. He, Marcelo Gameiro Munhoz, D. J. Prindle, G. S. Averichev, N. G. Minaev, M. Cherney, J. Speltz, N. Xu, Thomas Michael Cormier, M. DePhillips, P. Filip, M. A. Lisa, E. Braidot, M. Sarsour, G. D. Westfall, M. Zawisza, H. M. Spinka, Jana Bielcikova, Michal Sumbera, Petr Jákl, Y. Bai, P. Sorensen, X. H. Shi, Peter Graham Jones, S. W. Wissink, Y. Zhang, Nikola Poljak, L. Didenko, Adam Ryszard Kisiel, J. C. Dunlop, H. J. Crawford, S. R. Klein, T. Tarnowsky, N. L. Subba, D. L. Olson, Zubayer Ahammed, M. J. LeVine, A. A. Derevschikov, A. L. Trattner, C. Roy, H. Gos, P. Chaloupka, R. Witt, S. Mioduszewski, V. Yu Khodyrev, B. K. Srivastava, I. M. Vasilevski, A. Gupta, S. Bhardwaj, Boris Hippolyte, Basanta Kumar Nandi, S. Zhang, V. A. Okorokov, A. Chikanian, M. J. Skoby, V. N. Tram, D. Arkhipkin, A. Hamed, V. Fine, Jake Y. Chen, A. Iordanova, R. N. Singaraju, A. P. Meschanin, A. Kumar, F. Du, V. Rykov, L. V. Nogach, M. J. Ng, Manish Sharma, R. S. Longacre, V. I. Kravtsov, Debasish Das, Raghunath Sahoo, M. A.C. Lamont, P. Kurnadi, G. Igo, J. Bouchet, Zhenyu Zhang, M. R. Cosentino, J. Millane, Andrew Rose, Y. Zhao, F. Benedosso, T. G. Dedovich, T. Sakuma, S. C. Phatak, M. S. Daugherity, L. C. Bland, J. Fedorisin, A. G. Knospe, L. Liu, M. C. Suarez, Raimond Snellings, J. Ulery, H. G. Ritter, F. Laue, A. Szanto de Toledo, J. Kapitan, O. Barannikova, R. Bellwied, L. Gaillard, S. M. Dogra, Xiangming Sun, T. Pawlak, X. Lin, Russell Richard Betts, D. G. Underwood, Lijuan Ruan, B. D. Anderson, M. Shao, T. J. Hallman, J. Cheng, T. J. M. Symons, N. K. Pruthi, R. Varma, G. Eppley, Yu A. Matulenko, B. Stringfellow, J. Pluta, M. Pachr, R. E. Tribble, Gerald W Hoffmann, J. G. Cramer, N. Zachariou, T. S. McShane, S. Baumgart, S. Kabana, and Y. P. Viyogi

Subjects
Quantum chromodynamics, Physics, Particle physics, Proton, Meson, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, Perturbative QCD, 7. Clean energy, 01 natural sciences, Gluon, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

We report precision measurements of the Feynman x (x(F)) dependence, and first measurements of the transverse momentum (p(T)) dependence, of transverse single-spin asymmetries for the production of pi(0) mesons from polarized proton collisions at s=200 GeV. The x(F) dependence of the results is in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the p(T) dependence at fixed x(F) are not consistent with these same perturbative QCD-based calculations.

Published
2008

37. Hadronic resonance production ind+Aucollisions atsNN=200GeV measured at the BNL Relativistic Heavy Ion Collider

Author

L. K. Mangotra, M. S. Ganti, Bruna, R. Manweiler, Hongfang Liu, G. Van Buren, Y. P. Lu, A. M. Poskanzer, J. L. Drachenberg, M. Zawisza, H. M. Spinka, V. Perevoztchikov, C. A. Whitten, Feng Jin, C. Roy, T. W. Ludlam, J. M. Nelson, R. Fatemi, Yan Li, N. Gupta, A. Feng, W. Peryt, K. Krueger, A. Kechechyan, Andre Mischke, J. A. Vanfossen, Jay Roberts, S. J. Lindenbaum, W. J. Llope, B. Erazmus, M. Calderon De La Barca Sanchez, O. Catu, V. Ghazikhanian, Raimond Snellings, Xiangming Sun, F. Liu, Y. Panebratsev, C. De Silva, M. S. Daugherity, J. H. Thomas, M. DePhillips, D. Grosnick, B. V.K.S. Potukuchi, V. Kouchpil, S. Chattopdhyay, Jie Liu, M. Krus, R. Cendejas, D. Thein, G. Wang, J. Callner, Kyungeon Choi, A. Szanto Detoledo, Hanna Paulina Zbroszczyk, D. R. Beavis, A. Kocoloski, Michal Sumbera, T. P. Burton, L. Kotchenda, S. Hepplemann, W. He, P. Chaloupka, M. L. Miller, M. Cherney, Thomas Michael Cormier, B. Haag, D. Cebra, S. Trentalange, Zebo Tang, S. Dash, Marek Bombara, J. G. Cramer, J. L. Romero, M. Estienne, B. Grube, Y. Bai, S. W. Wissink, Y. Zhang, M. Kopytine, M. Tokarev, R. D. Majka, Lokesh Kumar, M. Sarsour, P. Seyboth, E. J. Garcia-Solis, C-Q. Li, Guo-Liang Ma, Morton Kaplan, X. Z. Cai, Nikola Poljak, E. P. Sichtermann, H. Bichsel, J. Ulery, J. Y. Chen, G. Odyniec, Y. Zoulkarneeva, S. Margetis, R. F. Clarke, J. Schambach, A. S. Hirsch, M. Sharma, Anju Bhasin, S. M. Guertin, Jana Bielcikova, Alexandre Alarcon Do Passo Suaide, David Lynn, R. P. Scharenberg, Christina Markert, H. G. Ritter, R. S. Longacre, R. Witt, J. C. Webb, R. Derradi de Souza, B. I. Abelev, O. Barannikova, R. Bellwied, P. Kravtsov, B. D. Anderson, Q. Wang, S. Mioduszewski, E. Finch, Bedangadas Mohanty, Z. Chajecki, W. Guryn, T. D. S. Stanislaus, J. Balewski, R. Reed, M. J. Russcher, B. E. Bonner, N. G. Minaev, D. P. Mahapatra, P. Djawotho, Yuanfang Wu, David Jonathan Hofman, L. Gaillard, V. Yu Khodyrev, Debasish Das, Raghunath Sahoo, M. A.C. Lamont, H. H. Wieman, O. D. Tsai, R. S. Hollis, P. Sorensen, H. S. Matis, X. H. Shi, Rashmi Raniwala, N. K. Pruthi, Peter Graham Jones, J. Sowinski, O. G. Grebenyuk, M. I. Mall, M. Elnimr, M. C. Cervantes, A. Stadnik, T. S. McShane, B. K. Srivastava, I. M. Vasilevski, L. C. Bland, W. W. Jacobs, Basanta Kumar Nandi, G. Igo, J. H. Chen, M. J. M. Codrington, Claude Andre Pruneau, M. Bystersky, J. Fedorisin, A. M. Vander Molen, N. Xu, P. Filip, Peter Martin Jacobs, J. Bouchet, Jing Zhou, L. Didenko, J. Lauret, G. Eppley, C. Perkins, S. U. Chung, S. Q. Zhang, A. Lebedev, A. G. Knospe, Tlusty, S. Bhardwaj, B. Biritz, Boris Hippolyte, G. D. Westfall, Adam Ryszard Kisiel, J. Millane, J. W. Harris, Marcelo Gameiro Munhoz, D. J. Prindle, T. Peitzmann, V. A. Okorokov, S. R. Klein, T. Tarnowsky, N. L. Subba, D. R. Gangaharan, L. Liu, J. Takahashi, S. Baumgart, I. K. Yoo, Z. Xu, G. Lin, J. C. Dunlop, H. J. Crawford, D. L. Olson, J. Pluta, M. C. Suarez, R. Lednicky, Andrew Rose, Y. Zhao, S. B. Nurushev, Petr Jákl, M. A. Lisa, Anik Gupta, Yinina Ma, Zubayer Ahammed, A. A. Derevschikov, A. L. Trattner, Anthony R. Timmins, Y. Fisyak, E. Braidot, T. Ullrich, P. Yepes, A. Chikanian, M. J. Skoby, M. J. LeVine, V. N. Tram, Sevil Salur, Y. Wang, E. G. Judd, J. Kapitan, M. Botje, S. Bueltmann, A. H. Tang, E. Elhalhuli, S. M. Dogra, Sergey Voloshin, Christine Nattrass, D. K. Mishra, R. N. Singaraju, Jifa Tian, M. Pachr, P. Fachini, A. P. Meschanin, Sergey Timoshenko, R. E. Tribble, Y. J. Sun, T. Pawlak, K. S.F.F. Guimaraes, D. Arkhipkin, A. Hamed, W. T. Waggoner, Gerald W Hoffmann, A. Shabetai, R. Zoulkarneev, X. Lin, A. Iordanova, S. Kabana, Y. P. Viyogi, Q. H. Xu, Z. J. Sun, V. Emelianov, A. K. Bhati, J. Baudot, W. Zhan, M. Wada, Russell Richard Betts, J. Joseph, T. J. Humanic, D. Keane, L. Eun, Nikolai Smirnov, G. M.S. Vasconcelos, D. G. Underwood, J. Mitchell, L. G. Efimov, Lijuan Ruan, Y. Pandit, Qian Yue, N. Schmitz, C-H. Lee, T. K. Nayak, E. Shahaliev, R. L. Ray, M. Shao, R. Varma, D. Staszak, Yu A. Matulenko, B. S. Page, T. J. Hallman, J. Cheng, T. J. M. Symons, Xuan Wang, A. Ogawa, B. Stringfellow, H. F. Chen, T. Ljubicic, Thomas A. Trainor, W. R. Edwards, W. Christie, H. Caines, Sudhir Raniwala, Mirko Planinic, W. M. Zhang, Y. N. Gorbunov, Andrey Vasiliev, X. L. Wang, K. Kajimoto, C. Zhong, Janet Elizabeth Seger, A. M. Hoffman, M. van Leeuwen, X. Dong, S. K. Pal, A. Ridiger, D. D. Koetke, J. E. Draper, D. Kettler, G. S. Averichev, J. P. Coffin, H. Z. Huang, S. Vokal, K. Kang, J. Kiryluk, D. A. Morozov, J. Engelage, Premomoy Ghosh, J. M. Landgraf, M. Strikhanov, J. Sandweiss, C. Nepali, Jorn Henning Putschke, A. V. Brandin, H. Okada, S. E. Vigdor, Christian Claude Kuhn, H. Zhang, I. Sakrejda, J. X. Zuo, M. Heinz, Lee Stuart Barnby, Jaroslav Bielcik, S. LaPointe, M. R. Dutta Mazumdar, O. V. Rogachevskiy, W. A. Love, A. Gordon, I. Selyuzhenkov, Bernd Surrow, J. S. Wang, Pawan Kumar Netrakanti, C. A. Gagliardi, Madan M. Aggarwal, Fuqiang Wang, Yong Xu, Frank Simon, S. S. Shi, F. Du, V. Rykov, L. V. Nogach, M. J. Ng, V. I. Kravtsov, V. Fine, P. Kurnadi, Zhenyu Zhang, M. R. Cosentino, F. Benedosso, T. G. Dedovich, T. Sakuma, S. C. Phatak, and F. Videbæk

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Star (game theory), Hadron, Resonance, Lambda, 01 natural sciences, 7. Clean energy, Spectral line, Nuclear physics, 0103 physical sciences, Transverse mass, Production (computer science), Atomic physics, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

We present the first measurements of the {rho}(770){sup 0}, K*(892), {Delta}(1232){sup ++}, {Sigma}(1385), and {Lambda}(1520) resonances in d+Au collisions at {radical}s{sub NN} = 200 GeV, reconstructed via their hadronic decay channels using the STAR detector at RHIC. The masses and widths of these resonances are studied as a function of transverse momentum (p{sub T}). We observe that the resonance spectra follow a generalized scaling law with the transverse mass (m{sub T}). The of resonances in minimum bias collisions is compared to the of {pi}, K, and {bar p}. The {rho}{sup 0}/{pi}{sup -}, K*/K{sup -}, {Delta}{sup ++}/p, {Sigma}(1385)/{Lambda}, and {Lambda}(1520)/{Lambda} ratios in d + Au collisions are compared to the measurements in minimum bias p + p interactions, where we observe that both measurements are comparable. The nuclear modification factors (R{sub dAu}) of the {rho}{sup 0}, K*, and {Sigma}* scale with the number of binary collisions (N{sub bin}) for p{sub T} > 1.2 GeV/c.

Published
2008

38. Longitudinal Double-Spin Asymmetry for Inclusive Jet Production inp→+p→Collisions ats=200 GeV

Author

A. Ridiger, Thorsten Sven Kollegger, Y. Panebratsev, R. S. Longacre, D. Grosnick, V. Kouchpil, M. Wada, C. A. Whitten, S. Heppelmann, Debasish Das, Raghunath Sahoo, L. Martin, M. A.C. Lamont, A. Bellingeri-Laurikainen, G. Igo, S. Lange, D. D. Koetke, Jana Bielcikova, J. E. Draper, S. J. Lindenbaum, J. Bouchet, H. Bichsel, G. Odyniec, J. Millane, Y. Zoulkarneeva, M. Potekhin, Andrew Rose, Y. Zhao, E. M. Kislov, J. G. Cramer, M. Heinz, Lee Stuart Barnby, J. P. Coffin, B. Grube, L. Kotchenda, David Lynn, M. J. Russcher, Jaroslav Bielcik, C. Roy, M. R. Dutta Mazumdar, O. V. Rogachevskiy, N. G. Minaev, V. Emelianov, A. K. Bhati, D. Keane, O. G. Grebenyuk, V. B. Dunin, N. Xu, P. Filip, Nikolai Smirnov, Jie Liu, R. Stock, G. D. Westfall, J. Mitchell, L. G. Efimov, R. N. Singaraju, A. P. Meschanin, J. Fedorisin, Petr Jákl, W. A. Love, H. Z. Huang, S. Vokal, J. G. Ma, Jing Zhou, C-H. Lee, T. K. Nayak, R. Fatemi, A. G. Knospe, Raimond Snellings, B. E. Bonner, Manish Sharma, G. Wang, L. K. Mangotra, Vitaly Okorokov, O. D. Tsai, Russell Richard Betts, K. Krueger, Bernd Surrow, D. G. Underwood, S. M. Guertin, J. Kiryluk, Bedangadas Mohanty, M. C. Cervantes, Lijuan Ruan, T. J. Humanic, Alexandre Alarcon Do Passo Suaide, Sergey Timoshenko, R. Manweiler, B. Erazmus, W. J. Llope, Sergey Voloshin, Christine Nattrass, D. A. Morozov, P. Seyboth, Pawan Kumar Netrakanti, N. T. Porile, E. J. Garcia-Solis, Xiangming Sun, Qian Yue, M. Shao, A. M. Poskanzer, D. P. Mahapatra, R. S. Hollis, H. Gos, T. J. Hallman, C. A. Gagliardi, J. Cheng, D. Cebra, N. van der Kolk, P. Chaloupka, J. Callner, R. Varma, S. Trentalange, T. J. M. Symons, M. Estienne, David Jonathan Hofman, S. R. Klein, T. Tarnowsky, N. L. Subba, Yu A. Matulenko, K. Kang, W. Christie, A. Kechechyan, Andre Mischke, Sevil Salur, Y. Wang, W. He, D. L. Olson, Madan M. Aggarwal, A. I. Kulikov, B. I. Abelev, J. Baudot, W. Zhan, Fuqiang Wang, J. H. Chen, B. Stringfellow, S. U. Chung, J. Takahashi, T. S. McShane, M. Bystersky, J. Speltz, Marcelo Gameiro Munhoz, D. J. Prindle, M. Cherney, W. M. Zhang, A. Stadnik, Thomas Michael Cormier, Andrey Vasiliev, M. J. Horner, T. P. Burton, Wen-Qing Shen, A. A. Derevschikov, Peter Martin Jacobs, F. Laue, A. Szanto de Toledo, M. DePhillips, Sukalyan Chattopadhyay, V. I. Yurevich, J. Kapitan, S. Baumgart, R. Witt, S. M. Dogra, Michal Sumbera, Yuanfang Wu, P. Djawotho, Y. Lu, A. Ogawa, H. F. Chen, T. W. Henry, Frank Simon, S. Mioduszewski, T. Pawlak, Janet Elizabeth Seger, A. M. Hoffman, Thomas A. Trainor, W. R. Edwards, S. B. Nurushev, A. N. Zubarev, M. Kopytine, J. Fu, V. Yu Khodyrev, M. S. Ganti, M. Tokarev, Y. Bai, M. A. Lisa, X. Lin, B. D. Anderson, M. Sarsour, S. W. Wissink, Basanta Kumar Nandi, S. Kabana, Y. P. Viyogi, M. J. M. Codrington, A. I. Pavlinov, T. Dietel, I. Selyuzhenkov, J. W. Harris, P. Fachini, B. V.K.S. Potukuchi, F. Liu, B. K. Srivastava, Y. Zhang, I. M. Vasilevski, Mirko Planinic, G. Van Buren, K. S.F.F. Guimaraes, Nikola Poljak, N. K. Pruthi, T. D. S. Stanislaus, N. Schmitz, Yinina Ma, R. D. Majka, T. W. Ludlam, S. Bhardwaj, Boris Hippolyte, J. M. Nelson, J. Y. Chen, V. V. Belaga, Anthony R. Timmins, Y. N. Gorbunov, H. H. Wieman, J. Engelage, H. Liu, A. Chikanian, M. J. Skoby, J. C. Dunlop, V. N. Tram, S. Margetis, R. F. Clarke, J. Schambach, P. Yepes, Yan Li, P. Sorensen, Anju Bhasin, G. Eppley, Zubayer Ahammed, W. Peryt, Peter Graham Jones, Renaud Vernet, A. H. Tang, C-Q. Li, E. Shahaliev, M. J. LeVine, A. Lebedev, M. M. de Moura, M. Botje, J. Pluta, I. K. Yoo, V. Perevoztchikov, E. W. Hughes, L. Didenko, Premomoy Ghosh, K. L. Kowalik, D. Arkhipkin, A. Hamed, R. P. Scharenberg, Christina Markert, Morton Kaplan, X. Z. Cai, H. S. Matis, A. Iordanova, Y. Fisyak, A. M. Vander Molen, E. G. Judd, J. M. Landgraf, J. L. Drachenberg, M. Calderon De La Barca Sanchez, E. Hjort, M. Pachr, R. E. Tribble, N. Gupta, A. Feng, O. Catu, Gerald W Hoffmann, M. Strikhanov, W. W. Jacobs, Jay Roberts, A. Kocoloski, Q. Li, S. Lehocka, M. L. Miller, J. Lauret, S. Dash, R. Lednicky, S. L. Blyth, V. Ghazikhanian, A. Shabetai, J. Sandweiss, Guo-Liang Ma, Q. H. Xu, Z. J. Sun, A. S. Hirsch, J. C. Webb, P. Kravtsov, Adam Ryszard Kisiel, H. J. Crawford, J. Sowinski, B. Haag, I. A. Qattan, Z. Chajecki, Marek Bombara, J. L. Romero, C. Perkins, P. S. Sazhin, T. Peitzmann, E. Finch, Z. Xu, G. Lin, Anik Gupta, Jianhong Wu, E. Elhalhuli, W. T. Waggoner, V. Fine, X. L. Wang, C. Zhong, M. van Leeuwen, X. Dong, S. K. Pal, P. Kurnadi, R. L. Ray, E. Potrebenikova, Zhenyu Zhang, M. R. Cosentino, D. Staszak, M. S. Daugherity, T. Ljubicic, F. Benedosso, H. Caines, Sudhir Raniwala, L. C. Bland, T. G. Dedovich, S. S. Shimanskiy, D. Relyea, T. Sakuma, E. P. Sichtermann, S. C. Phatak, J. Balewski, Rashmi Raniwala, Claude Andre Pruneau, T. Ullrich, R. Zoulkarneev, A. A. Kuznetsov, L. Liu, A. Kumar, F. Du, M. C. Suarez, L. V. Nogach, V. I. Kravtsov, M. Zawisza, H. M. Spinka, J. Ulery, J. H. Thomas, H. G. Ritter, D. Kettler, G. S. Averichev, O. Barannikova, R. Bellwied, H. Zhang, L. Gaillard, I. Sakrejda, J. X. Zuo, S. LaPointe, J. S. Wang, C. Nepali, Jorn Henning Putschke, A. V. Brandin, S. E. Vigdor, and Christian Claude Kuhn

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, Nuclear Theory, General Physics and Astronomy, Jet (particle physics), Deep inelastic scattering, 01 natural sciences, Asymmetry, Gluon, Nuclear physics, Transverse plane, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, media_common, Spin-½
Abstract

We report a new STAR measurement of the longitudinal double-spin asymmetry A(LL) for inclusive jet production at midrapidity in polarized p+p collisions at a center-of-mass energy of root s = 200 GeV. The data, which cover jet transverse momenta 5 < p(T) < 30 GeV/c, are substantially more precise than previous measurements. They provide significant new constraints on the gluon spin contribution to the nucleon spin through the comparison to predictions derived from one global fit to polarized deep-inelastic scattering measurements. They provide significant new constraints on the gluon spin contribution to the nucleon spin through the comparison to predictions derived from one global fit to polarized deep-inelastic scattering measurements.

Published
2008

39. Spin alignment measurements of theK*0(892)andϕ(1020)vector mesons in heavy ion collisions atsNN=200GeV

Author

Zhenyu Zhang, M. R. Cosentino, F. Benedosso, V. Fine, Jake Y. Chen, T. G. Dedovich, T. Sakuma, S. C. Phatak, F. Du, V. Rykov, L. V. Nogach, M. J. Ng, V. I. Kravtsov, H. Zhang, I. Sakrejda, J. X. Zuo, David Jonathan Hofman, Kyungeon Choi, L. Kotchenda, A. M. Vander Molen, A. Stadnik, R. S. Longacre, S. LaPointe, A. Gordon, Peter Martin Jacobs, G. Eppley, Y. F. Wu, Xu Cai, Gang Wang, J. Takahashi, Debasish Das, Raghunath Sahoo, J. Pluta, S. B. Nurushev, M. A.C. Lamont, G. Igo, D. Thein, T. P. Burton, J. Bouchet, J. Millane, P. Djawotho, M. Pachr, R. E. Tribble, Andrew Rose, Y. Zhao, Gerald W Hoffmann, Morton Kaplan, S. M. Guertin, M. Sharma, M. Kopytine, Alexandre Alarcon Do Passo Suaide, J. S. Wang, R. N. Singaraju, A. P. Meschanin, Raimond Snellings, N. G. Minaev, D. P. Mahapatra, G. Van Buren, Mikhail Tokarev, Xiangming Sun, R. S. Hollis, S. S. Shi, T. W. Ludlam, J. G. Cramer, J. M. Nelson, C. Nepali, Yinina Ma, T. D. S. Stanislaus, Jorn Henning Putschke, B. D. Anderson, A. V. Brandin, Yan Li, H. Okada, W. Peryt, V. Ghazikhanian, H. H. Wieman, W. Christie, N. K. Pruthi, S. E. Vigdor, C. A. Whitten, Marek Bombara, Christian Claude Kuhn, L. K. Mangotra, W. M. Zhang, Andrey Vasiliev, Adam Ryszard Kisiel, J. L. Romero, H. J. Crawford, R. Manweiler, Xiaoyu Wang, F. Laue, Shaobo Zhang, A. Chikanian, M. J. Skoby, S. Lange, E. Finch, R. Fatemi, Jana Bielcikova, Christine Nattrass, V. N. Tram, A. Szanto de Toledo, A. M. Poskanzer, J. L. Drachenberg, K. Krueger, S. J. Lindenbaum, Q. H. Xu, H. Z. Huang, S. Vokal, K. Kajimoto, J. Kapitan, S. M. Dogra, N. Xu, P. Filip, Z. J. Sun, Janet Elizabeth Seger, Thomas Peitzmann, P. Sorensen, G. D. Westfall, D. Arkhipkin, A. Hamed, Peter Graham Jones, A. M. Hoffman, A. Kechechyan, Andre Mischke, G. M.S. Vasconcelos, J. Callner, W. He, T. Pawlak, Petr Jákl, N. Gupta, A. Feng, T. J. Humanic, M. Cherney, Thomas Michael Cormier, Lokesh Kumar, J. W. Harris, R. Cendejas, N. Schmitz, Akash Kumar, E. Shahaliev, A. Iordanova, M. Sarsour, X. Lin, J. Kiryluk, Pijush Ghosh, L. Didenko, X-H. Shi, N. T. Porile, Jay Roberts, P. Seyboth, E. J. Garcia-Solis, C. Roy, Anthony R. Timmins, Qian Yue, D. A. Morozov, B. Grube, J. Baudot, M. Wada, F. Liu, P. Yepes, A. Ridiger, S. Bueltmann, A. H. Tang, Thorsten Sven Kollegger, R. Varma, Yu A. Matulenko, S. Heppelmann, W. Guryn, R. Derradi de Souza, B. I. Abelev, B. Haag, P. Chaloupka, D. D. Koetke, J. E. Draper, B. Stringfellow, S. R. Klein, O. G. Grebenyuk, T. Tarnowsky, N. L. Subba, D. L. Olson, Zebo Tang, J. Fedorisin, Sergei A. Voloshin, J. P. Coffin, Hong Liu, A. G. Knospe, T. S. McShane, Russell Richard Betts, I. A. Qattan, Z. Chajecki, M. J. M. Codrington, D. G. Underwood, Lijuan Ruan, A. A. Derevschikov, S. Baumgart, A. L. Trattner, R. D. Majka, C. Perkins, J. C. Dunlop, Z. Xu, G. Lin, M. Shao, S. Margetis, R. F. Clarke, J. Schambach, Anju Bhasin, T. J. Hallman, J. Cheng, T. J. M. Symons, Sergey Timoshenko, Jianhong Wu, Basanta Kumar Nandi, S. Kabana, J. Tian, E. Elhalhuli, I. Selyuzhenkov, Y. P. Viyogi, Zubayer Ahammed, M. J. LeVine, A. Lebedev, Vitaly Okorokov, M. M. de Moura, B. Biritz, M. Botje, Y. Fisyak, Bernd Surrow, W. T. Waggoner, P. Fachini, M. Calderon De La Barca Sanchez, K. S.F.F. Guimaraes, Pawan Kumar Netrakanti, O. Catu, C. A. Gagliardi, N. van der Kolk, A. Ogawa, A. Kocoloski, Madan M. Aggarwal, H. F. Chen, S. Dash, Thomas A. Trainor, W. R. Edwards, Fuqiang Wang, C-Q. Li, R. Witt, R. P. Scharenberg, Christina Markert, S. Mioduszewski, W. L. Zhan, H. S. Matis, V. Yu Khodyrev, Frank Simon, Subrata Pal, M. Heinz, Lee Stuart Barnby, Jaroslav Bielcik, B. K. Srivastava, I. M. Vasilevski, W. W. Jacobs, J. Lauret, M. R. Dutta Mazumdar, A. Gupta, S. Bhardwaj, Boris Hippolyte, O. V. Rogachevskiy, R. Lednicky, W. A. Love, Y. Panebratsev, D. Grosnick, V. Kouchpil, T. Dietel, B. E. Bonner, Mirko Planinic, O. D. Tsai, M. Elnimr, M. C. Cervantes, Sevil Salur, Y. Wang, V. Emelianov, A. K. Bhati, D. Keane, Y. N. Gorbunov, Nikolai Smirnov, R. Stock, J. Mitchell, L. G. Efimov, C-H. Lee, T. K. Nayak, J. Ulery, H. G. Ritter, Bedangadas Mohanty, O. Barannikova, R. Bellwied, L. Gaillard, M. S. Daugherity, L. C. Bland, L. Liu, M. C. Suarez, J. H. Chen, M. Bystersky, F. Videbæk, Sukalyan Chattopadhyay, M. DePhillips, Michal Sumbera, M. S. Ganti, Y. Bai, S. W. Wissink, Y. Zhang, Nikola Poljak, V. Perevoztchikov, E. W. Hughes, I. K. Yoo, Alexandre Shabetai, M. L. Miller, Y. Lu, D. R. Gangadharan, E. G. Judd, Guo-Liang Ma, A. S. Hirsch, J. C. Webb, P. Kravtsov, J. Sowinski, J. Engelage, J. M. Landgraf, M. Strikhanov, J. Sandweiss, K. Kang, B. V.K.S. Potukuchi, Jie Liu, Hanna Paulina Zbroszczyk, D. R. Beavis, X. L. Wang, C. Zhong, M. van Leeuwen, X. Dong, F. Jin, W. J. Llope, R. L. Ray, D. Staszak, J. H. Thomas, T. Ljubicic, H. Caines, Sudhir Raniwala, E. P. Sichtermann, J. Balewski, Rashmi Raniwala, Claude Andre Pruneau, D. Kettler, T. Ullrich, R. Zoulkarneev, L. Eun, G. S. Averichev, M. Zawisza, H. M. Spinka, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, M. Potekhin, David Lynn, Q. Wang, M. J. Russcher, J. G. Ma, Jing Zhou, B. Erazmus, D. Cebra, S. Trentalange, M. Estienne, S. U. Chung, Marcelo Gameiro Munhoz, D. J. Prindle, M. A. Lisa, E. Braidot, and P. Kurnadi

Subjects
Physics, Density matrix, Nuclear and High Energy Physics, Angular momentum, Meson, Magnetic moment, Spins, 010308 nuclear & particles physics, Polarization (waves), 01 natural sciences, Nuclear physics, 0103 physical sciences, Quark–gluon plasma, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy
Abstract

We present the first spin alignment measurements for the K*{sup 0}(892) and (1020) vector mesons produced at midrapidity with transverse momenta up to 5 GeV/c at {radical}s{sub NN} = 200 GeV at RHIC. The diagonal spin-density matrix elements with respect to the reaction plane in Au+Au collisions are {rho}{sub 00} = 0.32 {+-} 0.04 (stat) {+-} 0.09 (syst) for the K*{sup 0} (0.8 < p{sub T} < 5.0 GeV/c) and {rho}{sub 00} = 0.34 {+-} 0.02 (stat) {+-} 0.03 (syst) for the {phi} (0.4 < p{sub T} < 5.0 GeV/c) and are constant with transverse momentum and collision centrality. The data are consistent with the unpolarized expectation of 1/3 and thus no evidence is found for the transfer of the orbital angular momentum of the colliding system to the vector-meson spins. Spin alignments for K*{sup 0} and {phi} in Au+Au collisions were also measured with respect to the particle's production plane. The {phi} result, {rho}{sub 00} = 0.41 {+-} 0.02 (stat) {+-} 0.04 (syst), is consistent with that in p+p collisions, {rho}{sub 00} = 0.39 {+-} 0.03 (stat) {+-} 0.06 (syst), also measured in this work. The measurements thus constrain the possible size of polarization phenomena in the production dynamicsmore » of vector mesons.« less

Published
2008

40. Centrality dependence of charged hadron and strange hadron elliptic flow fromsNN=200GeV Au+Au collisions

Author

R. Fatemi, V. Ghazikhanian, K. Krueger, R. L. Ray, J. S. Wang, J. Callner, Z. Xu, G. Lin, Sergey Voloshin, Christine Nattrass, D. Staszak, Sergey Timoshenko, Marek Bombara, W. He, Jun Takahashi, Anik Gupta, M. Cherney, Thomas Michael Cormier, J. L. Romero, C. W. Whitten, T. Ljubicic, Jana Bielcikova, Jianhong Wu, H. Caines, Sudhir Raniwala, Lokesh Kumar, M. Sarsour, X-H. Shi, P. Sorensen, E. Elhalhuli, M. Calderon De La Barca Sanchez, E. Finch, R. S. Longacre, D. Relyea, W. Christie, J. Baudot, M. Wada, Peter Graham Jones, O. Catu, E. P. Sichtermann, Kyungeon Choi, L. Kotchenda, P. Kurnadi, Debasish Das, Raghunath Sahoo, B. Grube, A. M. Vander Molen, H. Zhang, Y. F. Wu, A. Kocoloski, W. M. Zhang, Andrey Vasiliev, Zhenyu Zhang, J. Balewski, Rashmi Raniwala, M. A.C. Lamont, H. Z. Huang, S. Vokal, W. T. Waggoner, Claude Andre Pruneau, W. Guryn, I. Sakrejda, D. Thein, S. Dash, G. Igo, M. R. Cosentino, K. Kajimoto, T. P. Burton, L. Didenko, T. S. McShane, A. Ogawa, O. G. Grebenyuk, G. M.S. Vasconcelos, Janet Elizabeth Seger, J. Fedorisin, J. H. Thomas, H. F. Chen, W. R. Edwards, J. X. Zuo, T. Ullrich, A. M. Hoffman, F. Benedosso, M. Kopytine, R. Witt, N. Schmitz, E. Shahaliev, P. Djawotho, B. Haag, K. Schweda, M. Tokarev, S. Lange, J. Millane, A. G. Knospe, R. Zoulkarneev, J. Engelage, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, Raimond Snellings, T. Dietel, S. Mioduszewski, J. Kiryluk, S. J. Lindenbaum, Andrew Rose, Y. Zhao, S. LaPointe, W. J. Llope, A. Shabetai, Mirko Planinic, V. Yu Khodyrev, D. P. Mahapatra, R. S. Hollis, D. Kettler, Zebo Tang, Xiangming Sun, N. Xu, P. Filip, L. Eun, S. R. Klein, T. G. Dedovich, T. Tarnowsky, N. L. Subba, A. Gordon, C. Nepali, F. Laue, A. Szanto de Toledo, J. Kapitan, D. L. Olson, Jorn Henning Putschke, B. K. Srivastava, I. M. Vasilevski, T. D. S. Stanislaus, S. Baumgart, H. H. Wieman, S. M. Dogra, I. A. Qattan, Z. Chajecki, F. Liu, Q. H. Xu, S. U. Chung, T. Sakuma, Adam Ryszard Kisiel, G. D. Westfall, S. C. Phatak, A. V. Brandin, Y. N. Gorbunov, Marcelo Gameiro Munhoz, D. J. Prindle, T. Pawlak, H. Okada, G. S. Averichev, L. K. Mangotra, Z. J. Sun, S. Bhardwaj, Boris Hippolyte, Yinina Ma, A. A. Derevschikov, X. Lin, H. J. Crawford, A. L. Trattner, D. A. Morozov, C. Perkins, R. N. Singaraju, R. Manweiler, J. L. Drachenberg, Bedangadas Mohanty, Russell Richard Betts, Petr Jákl, T. Peitzmann, X. L. Wang, R. D. Majka, G. Wang, B. D. Anderson, D. G. Underwood, A. P. Meschanin, V. Fine, S. E. Vigdor, Christian Claude Kuhn, C. Zhong, P. Seyboth, Lijuan Ruan, A. M. Poskanzer, N. Gupta, A. Feng, E. J. Garcia-Solis, J. W. Harris, S. Margetis, R. F. Clarke, J. Schambach, V. Emelianov, A. K. Bhati, D. Keane, M. A. Lisa, Premomoy Ghosh, J. M. Landgraf, Anju Bhasin, Nikolai Smirnov, N. K. Pruthi, C-Q. Li, G. Eppley, M. Shao, Jay Roberts, A. Kechechyan, Andre Mischke, M. van Leeuwen, X. Dong, A. Ridiger, Thorsten Sven Kollegger, T. J. Hallman, J. Cheng, T. J. M. Symons, R. Derradi de Souza, B. I. Abelev, Jake Y. Chen, R. Stock, J. Mitchell, S. Kabana, J. Tian, L. G. Efimov, Y. P. Viyogi, A. Lebedev, Shaobo Zhang, S. K. Pal, R. P. Scharenberg, Christina Markert, Anthony R. Timmins, E. Braidot, H. S. Matis, P. Fachini, F. Jin, P. Yepes, M. M. de Moura, C-H. Lee, T. K. Nayak, B. E. Bonner, M. J. M. Codrington, S. Bueltmann, M. Botje, A. H. Tang, O. D. Tsai, M. C. Cervantes, S. Heppelmann, J. G. Cramer, M. Zawisza, H. M. Spinka, Jie Liu, W. W. Jacobs, J. Lauret, M. Strikhanov, M. Sharma, J. H. Chen, J. Pluta, J. C. Dunlop, Hanna Paulina Zbroszczyk, Y. Fisyak, R. Lednicky, M. Bystersky, B. Erazmus, A. Kumar, F. Du, N. G. Minaev, Zubayer Ahammed, M. J. LeVine, V. Rykov, L. V. Nogach, M. J. Ng, V. I. Kravtsov, Sevil Salur, Y. Wang, D. R. Beavis, Xuejun Wang, Y. Panebratsev, J. Sandweiss, T. J. Humanic, D. Grosnick, V. Kouchpil, D. Cebra, S. Trentalange, M. Estienne, N. T. Porile, Qian Yue, I. K. Yoo, R. Varma, Yu A. Matulenko, D. D. Koetke, J. E. Draper, B. Stringfellow, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, Bernd Surrow, Y. Lu, M. Pachr, K. Kang, M. Potekhin, E. G. Judd, David Lynn, Q. Wang, R. E. Tribble, Basanta Kumar Nandi, M. J. Russcher, M. DePhillips, Pawan Kumar Netrakanti, J. P. Coffin, Michal Sumbera, Gerald W Hoffmann, Y. Bai, J. G. Ma, Jing Zhou, S. W. Wissink, Y. Zhang, C. A. Gagliardi, N. van der Kolk, Nikola Poljak, V. A. Okorokov, B. V.K.S. Potukuchi, M. Heinz, Lee Stuart Barnby, Jaroslav Bielcik, M. R. Dutta Mazumdar, H. Liu, A. Chikanian, M. J. Skoby, O. V. Rogachevskiy, V. N. Tram, W. A. Love, Madan M. Aggarwal, Fuqiang Wang, M. Oldenburg, W. L. Zhan, Frank Simon, D. Arkhipkin, A. Hamed, A. Iordanova, C. Roy, J. Ulery, H. G. Ritter, O. Barannikova, R. Bellwied, L. Gaillard, P. Chaloupka, L. C. Bland, L. Liu, M. C. Suarez, Guo-Liang Ma, A. S. Hirsch, J. C. Webb, P. Kravtsov, M. S. Daugherity, J. Sowinski, M. L. Miller, F. Videbæk, Sukalyan Chattopadhyay, M. S. Ganti, V. Perevoztchikov, E. W. Hughes, I. Selyuzhenkov, G. Van Buren, S. S. Shi, T. W. Ludlam, J. M. Nelson, Yan Li, W. Peryt, David Jonathan Hofman, A. Stadnik, Peter Martin Jacobs, S. B. Nurushev, Morton Kaplan, and X. Z. Cai

Subjects
Physics, Quark, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Elliptic flow, 01 natural sciences, Omega, Nuclear physics, 0103 physical sciences, Quark–gluon plasma, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Scaling
Abstract

We present STAR results on the elliptic flow upsilon(2) Of charged hadrons, strange and multistrange particles from,root s(NN) = 200 GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). The detailed study of the centrality dependence of upsilon(2) over a broad transverse momentum range is presented. Comparisons of different analysis methods are made in order to estimate systematic uncertainties. To discuss the nonflow effect, we have performed the first analysis Of upsilon(2) with the Lee-Yang zero method for K(S)(0) and A. In the relatively low PT region, P(T)

Published
2008

41. Enhanced strange baryon production in Au+Au collisions compared top+patsNN=200GeV

Author

A. Ridiger, Thorsten Sven Kollegger, J. Ulery, H. G. Ritter, O. Barannikova, R. Bellwied, R. L. Ray, L. Gaillard, R. S. Longacre, Sergey Timoshenko, Z. Xu, G. Lin, M. Heinz, Lee Stuart Barnby, D. Staszak, V. Ghazikhanian, S. Heppelmann, L. C. Bland, Jaroslav Bielcik, M. S. Daugherity, Anik Gupta, J. C. Dunlop, Marek Bombara, T. Ljubicic, N. Xu, L. Liu, D. Thein, C. Nepali, J. L. Romero, Jorn Henning Putschke, M. C. Suarez, Jianhong Wu, P. Filip, H. Caines, Sudhir Raniwala, Debasish Das, Raghunath Sahoo, M. Kopytine, J. Fu, H. Liu, M. R. Dutta Mazumdar, Kyungeon Choi, A. Chikanian, M. J. Skoby, D. D. Koetke, J. E. Draper, L. Kotchenda, T. J. Humanic, Zubayer Ahammed, M. Tokarev, E. Elhalhuli, D. Relyea, B. Erazmus, M. A.C. Lamont, G. D. Westfall, M. L. Miller, A. V. Brandin, O. V. Rogachevskiy, V. N. Tram, H. Okada, E. Finch, N. T. Porile, E. P. Sichtermann, Jifa Tian, Adam Ryszard Kisiel, M. J. LeVine, G. Igo, A. Shabetai, Qian Yue, Petr Jákl, J. Balewski, Xuan Wang, H. J. Crawford, S. E. Vigdor, J. Bouchet, W. A. Love, J. P. Coffin, D. Cebra, S. Trentalange, Rashmi Raniwala, D. Arkhipkin, T. D. S. Stanislaus, A. Hamed, A. Ogawa, H. H. Wieman, R. Varma, Christian Claude Kuhn, W. T. Waggoner, Claude Andre Pruneau, Yu A. Matulenko, J. Millane, H. F. Chen, Thomas A. Trainor, W. R. Edwards, M. Estienne, J. H. Thomas, L. K. Mangotra, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, Guo-Liang Ma, Q. H. Xu, B. Haag, B. Stringfellow, C-Q. Li, A. M. Vander Molen, K. Kang, A. Iordanova, R. Fatemi, T. Ullrich, H. Z. Huang, S. Vokal, S. U. Chung, Z. J. Sun, R. Manweiler, T. S. McShane, R. P. Scharenberg, Christina Markert, Andrew Rose, Y. Zhao, I. K. Yoo, Y. G. Gorbunov, Marcelo Gameiro Munhoz, D. J. Prindle, K. Krueger, R. Zoulkarneev, C. Roy, H. Zhang, A. M. Poskanzer, S. Baumgart, Zebo Tang, H. S. Matis, E. Hjort, M. J. Horner, C. A. Whitten, Feng Jin, L. Eun, G. Wang, Bernd Surrow, M. A. Lisa, I. A. Qattan, P. Seyboth, A. S. Hirsch, J. C. Webb, J. Callner, I. Sakrejda, J. Kiryluk, D. Kettler, W. He, E. J. Garcia-Solis, A. Kechechyan, Andre Mischke, E. Braidot, Z. Chajecki, W. W. Jacobs, M. Cherney, J. X. Zuo, Thomas Michael Cormier, Lokesh Kumar, P. Kravtsov, S. Lange, R. N. Singaraju, A. P. Meschanin, J. Lauret, C. Perkins, D. A. Morozov, M. Sarsour, S. J. Lindenbaum, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, X. L. Wang, S. Kabana, Y. P. Viyogi, R. Derradi de Souza, B. I. Abelev, E. G. Judd, S. LaPointe, P. Chaloupka, C. Zhong, R. Lednicky, T. Peitzmann, Pawan Kumar Netrakanti, M. Potekhin, A. Gordon, G. S. Averichev, J. W. Harris, A. Kumar, M. van Leeuwen, X. Dong, T. W. Henry, David Lynn, Q. Wang, M. J. Russcher, R. Witt, J. Speltz, J. G. Cramer, F. Du, J. Sowinski, M. Sharma, S. K. Pal, Anthony R. Timmins, S. Mioduszewski, M. J. M. Codrington, C. A. Gagliardi, N. van der Kolk, M. DePhillips, J. S. Wang, P. Yepes, Yuanfang Wu, T. Dietel, S. Bueltmann, Renaud Vernet, N. G. Minaev, F. Videbæk, V. Rykov, V. Yu Khodyrev, A. H. Tang, J. Engelage, Michal Sumbera, Madan M. Aggarwal, Fuqiang Wang, Mirko Planinic, J. G. Ma, Jing Zhou, Basanta Kumar Nandi, Sukalyan Chattopadhyay, M. S. Ganti, M. Calderon De La Barca Sanchez, V. A. Okorokov, O. Catu, Y. Fisyak, G. M.S. Vasconcelos, L. V. Nogach, M. J. Ng, Premomoy Ghosh, J. M. Landgraf, A. Kocoloski, Q. Li, Y. Bai, Y. P. Lu, V. Perevoztchikov, E. W. Hughes, S. Dash, B. K. Srivastava, I. M. Vasilevski, N. Schmitz, E. Shahaliev, K. L. Kowalik, V. I. Kravtsov, S. W. Wissink, Y. Zhang, M. Strikhanov, S. L. Blyth, S. Bhardwaj, Nikola Poljak, Frank Simon, J. Sandweiss, Boris Hippolyte, J. L. Drachenberg, P. Kurnadi, M. Zawisza, H. M. Spinka, N. Gupta, A. Feng, Jay Roberts, Bedangadas Mohanty, Zhenyu Zhang, M. R. Cosentino, F. Benedosso, J. H. Chen, M. Bystersky, T. G. Dedovich, T. Sakuma, S. C. Phatak, V. Fine, A. I. Pavlinov, F. Liu, R. D. Majka, J. Y. Chen, S. Margetis, R. F. Clarke, J. Schambach, W. Christie, W. M. Zhang, Andrey Vasiliev, G. Eppley, K. Kajimoto, Janet Elizabeth Seger, A. M. Hoffman, Anju Bhasin, J. Pluta, S. Q. Zhang, A. Lebedev, M. M. de Moura, M. Botje, M. Pachr, R. E. Tribble, Gerald W Hoffmann, Raimond Snellings, Xiangming Sun, B. D. Anderson, N. K. Pruthi, S. R. Klein, T. Tarnowsky, N. L. Subba, D. L. Olson, A. A. Derevschikov, A. L. Trattner, Russell Richard Betts, P. Fachini, Sergey Voloshin, Christine Nattrass, K. S.F.F. Guimaraes, D. G. Underwood, Lijuan Ruan, M. Shao, Jana Bielcikova, T. J. Hallman, J. Cheng, T. J. M. Symons, P. Sorensen, X. H. Shi, Peter Graham Jones, L. Didenko, J. Baudot, W. Zhan, M. Wada, F. Laue, A. Szanto de Toledo, J. Kapitan, T. P. Burton, S. M. Dogra, P. Djawotho, T. Pawlak, Morton Kaplan, X. Z. Cai, X. Lin, David Jonathan Hofman, A. Stadnik, Peter Martin Jacobs, J. Takahashi, B. Grube, S. B. Nurushev, I. Selyuzhenkov, G. Van Buren, T. W. Ludlam, W. Guryn, J. M. Nelson, Yan Li, W. Peryt, O. G. Grebenyuk, J. Fedorisin, A. G. Knospe, D. P. Mahapatra, R. S. Hollis, Y. Panebratsev, D. Grosnick, V. Kouchpil, B. E. Bonner, O. D. Tsai, M. C. Cervantes, B. V.K.S. Potukuchi, Yu-Gang Ma, Sevil Salur, Y. Wang, W. J. Llope, V. Emelianov, A. K. Bhati, D. Keane, Nikolai Smirnov, R. Stock, J. Mitchell, L. G. Efimov, C-H. Lee, T. K. Nayak, Jie Liu, Hanna Paulina Zbroszczyk, and D. R. Beavis

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Hyperon, Strangeness, Lambda, 01 natural sciences, 7. Clean energy, Omega, Spectral line, Baryon, Nuclear physics, 0103 physical sciences, Rapidity, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

We report on the observed differences in production rates of strange and multistrange baryons in Au+Au collisions at √sNN=200 GeV compared to p+p interactions at the same energy. The strange baryon yields in Au+Au collisions, when scaled down by the number of participating nucleons, are enhanced relative to those measured in p+p reactions. The enhancement observed increases with the strangeness content of the baryon, and it increases for all strange baryons with collision centrality. The enhancement is qualitatively similar to that observed at the lower collision energy √sNN=17.3 GeV. The previous observations are for the bulk production, while at intermediate pT,1

Published
2008

42. Beam-Energy and System-Size Dependence of Dynamical Net Charge Fluctuations

Author

A. V. Brandin, H. Okada, S. E. Vigdor, Christian Claude Kuhn, M. M. De Moira, L. Kotchenda, A. Ridiger, Madan M. Aggarwal, T. S. McShane, J. H. Thomas, H. Zhang, J. S. Wang, E. G. Judd, A. Shabetai, I. Sakrejda, J. X. Zuo, S. LaPointe, Fuqiang Wang, A. Gordon, J. Wu, D. Thein, S. Baumgart, R. Fatemi, G. Eppley, David Jonathan Hofman, S. Bueltmann, D. Kettler, K. Krueger, R. S. Longacre, M. Kopytine, Z. J. Sun, Subhasis Chattopadhyay, Yong Xu, Thomas Peitzmann, M. S. Daugherity, V. Fine, R. Witt, R. L. Ray, M. J. Skoby, D. D. Koetke, J. Callner, M. Calderon De La Barca Sanchez, W. He, P. Fachini, A. Stadnik, M. Cherney, F. Laue, A. Szanto de Toledo, B. Erazmus, J. Kapitan, S. M. Dogra, Zebo Tang, G. S. Averichev, Y. P. Viyogi, Xu Cai, J. Pluta, W. M. Zhang, Andrey Vasiliev, S. Mioduszewski, V. N. Tram, L. C. Bland, Thomas Michael Cormier, Bedangadas Mohanty, Lokesh Kumar, Peter Martin Jacobs, V. Ghazikhanian, M. Sarsour, Debasish Das, Raghunath Sahoo, V. Yu Khodyrev, C. A. Gagliardi, O. Catu, Christine Nattrass, Gang Wang, Subrata Pal, T. D. S. Stanislaus, Z. Chajecki, M. A.C. Lamont, M. L. Miller, D. Staszak, Y. Fisyak, Sergei A. Voloshin, Janet Elizabeth Seger, J. P. Coffin, T. Pawlak, W. L. Zhan, H. H. Wieman, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, B. K. Srivastava, I. M. Vasilevski, J. Takahashi, J. G. Cramer, G. Igo, A. M. Hoffman, M. Pachr, R. E. Tribble, Mikhail Tokarev, Y. Panebratsev, D. Grosnick, Anju Bhasin, P. G. Jones, Frank Simon, K. S.F.F. Guimaraes, J. Engelage, L. K. Mangotra, D. P. Mahapatra, Gerald W Hoffmann, R. S. Hollis, C. Perkins, T. Ljubicic, S. Bhardwaj, Raimond Snellings, S. B. Nurushev, Marek Bombara, J. Bouchet, V. Kouchpil, X. Lin, Boris Hippolyte, J. L. Drachenberg, S. Vokal, R. Manweiler, T. Dictel, S. Zhang, M. Bystersky, Xiangming Sun, P. Seyboth, E. J. Garcia-Solis, A. Lebedev, J. Zhou, Adam Ryszard Kisiel, D. Arkhipkin, A. Kocoloski, B. V.K.S. Potukuchi, A. Hamed, Z. Xu, G. Lin, Yu-Gang Ma, A. Hirsch, Sudhir Raniwala, J. Millane, Premomoy Ghosh, I. Selyuzhenkov, Jana Bielcikova, J. M. Landgraf, M. DePhillips, A. M. Poskanzer, F. Videbæk, M. Botje, N. Gupta, A. Feng, Anik Gupta, R. Derradi de Souza, B. I. Abelev, B. Grube, J. L. Romero, Bernd Surrow, S. Dash, P. Kurnadi, W. J. Llope, Yufeng Zhang, Zhenyu Zhang, Michal Sumbera, J. E. Draper, Jianping Cheng, Andrew Rose, Jay Roberts, P. Sorensen, X. H. Shi, M. Strikhanov, J. Kiryluk, A. Kechechyan, Andre Mischke, Y. Zhao, B. D. Anderson, E. Elhalhuli, M. R. Cosentino, Hank Crawford, K. Kang, M. J. M. Codrington, Y. Bai, K. Kajimoto, Y. Li, J. Baudot, N. T. Porile, R. Cendejas, Qian Yue, M. Wada, Q. H. Xu, N. K. Pruthi, Jifa Tian, H. Caines, Ki-Seok Choi, M. S. Ganti, H. Bichsel, L. G. Efimov, W. Guryn, Pawan Kumar Netrakanti, E. Finch, Yifu Sun, S. W. Wissink, F. Benedosso, J. Sandweiss, D. A. Morozov, W. Christie, A. Iordanova, W. T. Waggoner, Nikola Poljak, L. Didenko, Chitrasen Jena, Samuel Heppelmann, Y. P. Lu, R. N. Singaraju, N. van der Kolk, V. Perevoztchikov, L. Huo, R. Varma, X. L. Wang, J. C. Dunlop, Yu A. Matulenko, A. P. Meschanin, F. Liu, O. G. Grebenyuk, M. Heinz, Lee Stuart Barnby, Morton Kaplan, C. Zhong, T. G. Dedovich, T. P. Burton, Jaroslav Bielcik, J. Liu, Zubayer Ahammed, T. Sakuma, S. R. Klein, S. C. Phatak, M. J. LeVine, T. Tarnowsky, N. L. Subba, Guo-Liang Ma, B. Stringfellow, R. D. Majka, J. Fedorisin, M. Zawisza, H. M. Spinka, Hanna Paulina Zbroszczyk, J. Y. Chen, D. L. Olson, S. Margetis, R. F. Clarke, I. K. Yoo, A. Chikanian, C. Roy, M. van Leeuwen, X. Dong, M. R. Dutta Mazumdar, D. R. Beavis, J. Schambach, G. Van Buren, A. G. Knospe, A. A. Derevschikov, A. L. Trattner, A. Kumar, J. C. Webb, P. Kravtsov, S. S. Shi, O. V. Rogachevskiy, F. Du, C. L. Jones, J. Joseph, Russell Richard Betts, D. R. Gangadharan, V. Emelianov, A. K. Bhati, D. Keane, T. W. Ludlam, G. M.S. Vasconcelos, E. P. Sichtermann, L. V. Nogach, M. J. Ng, J. M. Nelson, J. Balewski, Nikolai Smirnov, V. I. Kravtsov, J. Sowinski, Rashmi Raniwala, V. Rykov, Jing-Han Chen, W. Peryt, Claude Andre Pruneau, J. Mitchell, D. G. Underwood, Lijuan Ruan, C-H. Lee, T. K. Nayak, T. Ullrich, B. E. Bonner, O. D. Tsai, N. Schmitz, S. Kabana, M. Elnimr, R. Zoulkarneev, M. C. Cervantes, L. Eun, E. Shahaliev, Sevil Salur, A. M. Vander Molen, J. G. Ma, E. Hjort, Y. F. Wu, Y. Wang, M. Shao, Thomas Humanic, T. J. Hallman, J. W. Harris, P. Chaloupka, T. J. M. Symons, William Jacobs, Anthony R. Timmins, P. Yepes, A. H. Tang, Basanta Kumar Nandi, B. Biritz, V. A. Okorokov, G. Odyniec, Y. Zoulkarneeva, M. Potekhin, David Lynn, Q. Wang, M. J. Russcher, S. U. Chung, Marcelo Gameiro Munhoz, D. J. Prindle, M. A. Lisa, E. Braidot, D. Cebra, S. Trentalange, M. Estienne, C-Q. Li, R. P. Scharenberg, Christina Markert, H. S. Matis, J. Lauret, R. Lednicky, P. Djawotho, Sergey Timoshenko, Xuan Wang, A. Ogawa, H. F. Chen, W. R. Edwards, Mirko Planinic, Y. N. Gorbunov, C. A. Whitten, Feng Jin, S. J. Lindenbaum, N. Xu, P. Filip, G. D. Westfall, Petr Jákl, M. Sharma, N. G. Minaev, L. Liu, M. C. Suarez, J. Ulery, H. G. Ritter, H. Z. Huang, O. Barannikova, R. Bellwied, L. Gaillard, C. Nepali, Jorn Henning Putschke, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), STAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes)

Subjects
Nuclear and High Energy Physics, Au Collisions, Gev/C, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 0103 physical sciences, Mean Transverse-Momentum, Rapidity, Multiplicity (chemistry), Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Size dependence, Scaling, Nuclear Collisions, Physics, Signal, 010308 nuclear & particles physics, Heavy-Ion Collisions, Collision, By-Event Fluctuations, NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika, Azimuth, Multiplicity, Pseudorapidity, Quark–gluon plasma, Quark-Gluon Plasma, charge correlation strength, Atomic physics
Abstract

We present measurements of net charge fluctuations in $Au + Au$ collisions at $\sqrt{s_{NN}} = $ 19.6, 62.4, 130, and 200 GeV, $Cu + Cu$ collisions at $\sqrt{s_{NN}} = $ 62.4, 200 GeV, and $p + p$ collisions at $\sqrt{s} = $ 200 GeV using the dynamical net charge fluctuations measure $\nu_{+-{\rm,dyn}}$. We observe that the dynamical fluctuations are non-zero at all energies and exhibit a modest dependence on beam energy. A weak system size dependence is also observed. We examine the collision centrality dependence of the net charge fluctuations and find that dynamical net charge fluctuations violate $1/N_{ch}$ scaling, but display approximate $1/N_{part}$ scaling. We also study the azimuthal and rapidity dependence of the net charge correlation strength and observe strong dependence on the azimuthal angular range and pseudorapidity widths integrated to measure the correlation., Comment: 15 pages, 6 figures, STAR Collaboration

Published
2008
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43. System-Size Independence of Directed Flow Measured at the BNL Relativistic Heavy-Ion Collider

Author

A. M. Vander Molen, Y. F. Wu, B. Grube, M. L. Miller, X. L. Wang, W. Guryn, S. U. Chung, Guo-Liang Ma, Jie Liu, C. Zhong, A. Ridiger, A. S. Hirsch, J. C. Webb, P. Kravtsov, Marcelo Gameiro Munhoz, D. J. Prindle, L. K. Mangotra, R. Manweiler, I. Selyuzhenkov, Adam Ryszard Kisiel, J. Sowinski, J. L. Drachenberg, M. S. Daugherity, C. Roy, O. G. Grebenyuk, J. H. Thomas, C. A. Whitten, Feng Jin, Thorsten Sven Kollegger, A. M. Poskanzer, Bernd Surrow, H. J. Crawford, M. van Leeuwen, X. Dong, S. K. Pal, Hanna Paulina Zbroszczyk, F. Videbæk, Sergey Voloshin, Christine Nattrass, J. Fedorisin, N. Gupta, M. A. Lisa, D. R. Beavis, Sukalyan Chattopadhyay, A. Shabetai, M. S. Ganti, A. Kechechyan, Andre Mischke, Raimond Snellings, A. Feng, Y. P. Lu, V. Perevoztchikov, Y. Yang, E. W. Hughes, Jay Roberts, M. Calderon De La Barca Sanchez, R. S. Longacre, S. Heppelmann, W. Christie, A. G. Knospe, E. P. Sichtermann, Pawan Kumar Netrakanti, E. Braidot, Kyungeon Choi, L. Kotchenda, Z. Xu, G. Lin, R. Cendejas, K. Kang, S. Lange, J. Balewski, Rashmi Raniwala, R. Fatemi, D. Kettler, W. M. Zhang, Andrey Vasiliev, Claude Andre Pruneau, O. Catu, C. A. Gagliardi, S. J. Lindenbaum, G. M.S. Vasconcelos, N. van der Kolk, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, D. D. Koetke, J. E. Draper, C-Q. Li, A. Kumar, Debasish Das, K. Krueger, F. Du, Anik Gupta, N. Xu, P. Filip, D. Thein, J. Ulery, Raghunath Sahoo, T. Ullrich, K. Kajimoto, H. G. Ritter, V. Rykov, M. Potekhin, A. Kocoloski, P. Chaloupka, R. P. Scharenberg, Christina Markert, G. S. Averichev, F. Laue, A. Szanto de Toledo, M. Heinz, Lee Stuart Barnby, R. Zoulkarneev, N. Schmitz, E. Shahaliev, V. Ghazikhanian, Q. H. Xu, Xiangming Sun, Janet Elizabeth Seger, Z. J. Sun, M. A.C. Lamont, L. V. Nogach, M. J. Ng, Jaroslav Bielcik, J. G. Cramer, J. Baudot, M. Wada, G. D. Westfall, A. M. Hoffman, M. Kopytine, J. P. Coffin, Jianhong Wu, O. Barannikova, M. Tokarev, R. Bellwied, G. Igo, David Lynn, Q. Wang, L. Eun, V. I. Kravtsov, H. S. Matis, Marek Bombara, J. L. Romero, M. J. Russcher, R. Witt, J. Callner, A. Chikanian, M. J. Skoby, R. L. Ray, S. Mioduszewski, Petr Jákl, T. D. S. Stanislaus, V. N. Tram, J. Bouchet, L. Gaillard, L. C. Bland, Anju Bhasin, S. Q. Zhang, J. Kapitan, V. Yu Khodyrev, J. Engelage, D. Staszak, T. Ljubicic, S. Dash, L. Liu, H. Z. Huang, S. Vokal, E. Elhalhuli, H. Caines, Sudhir Raniwala, S. M. Dogra, V. Fine, B. K. Srivastava, I. M. Vasilevski, G. Wang, A. Lebedev, M. M. de Moura, M. Botje, J. Millane, T. Pawlak, W. He, M. Cherney, Thomas Michael Cormier, Lokesh Kumar, X. Lin, M. R. Dutta Mazumdar, O. V. Rogachevskiy, M. Sarsour, B. D. Anderson, M. C. Suarez, W. W. Jacobs, J. Lauret, E. Finch, D. Arkhipkin, A. Hamed, P. Seyboth, E. J. Garcia-Solis, Andrew Rose, Y. Zhao, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, J. G. Ma, Jing Zhou, Jake Y. Chen, Premomoy Ghosh, M. Zawisza, H. M. Spinka, W. J. Llope, W. A. Love, Bedangadas Mohanty, T. J. Humanic, J. M. Landgraf, A. Iordanova, T. P. Burton, S. Bhardwaj, J. Kiryluk, Russell Richard Betts, R. Lednicky, M. Strikhanov, N. K. Pruthi, Jifa Tian, D. P. Mahapatra, Boris Hippolyte, J. C. Dunlop, R. Derradi de Souza, B. I. Abelev, N. T. Porile, P. Djawotho, R. S. Hollis, D. G. Underwood, Lijuan Ruan, H. H. Wieman, Zubayer Ahammed, D. A. Morozov, Qian Yue, B. Erazmus, T. Dietel, M. J. LeVine, G. Eppley, Madan M. Aggarwal, Fuqiang Wang, R. N. Singaraju, P. Kurnadi, A. P. Meschanin, J. Sandweiss, F. Liu, M. Sharma, M. Shao, Mirko Planinic, Zhenyu Zhang, T. J. Hallman, R. Varma, Yu A. Matulenko, M. J. M. Codrington, M. R. Cosentino, D. Cebra, J. Cheng, T. J. M. Symons, S. Trentalange, N. G. Minaev, Yong Xu, Basanta Kumar Nandi, M. Estienne, B. Stringfellow, J. Pluta, F. Benedosso, Y. N. Gorbunov, T. S. McShane, R. D. Majka, W. T. Waggoner, B. Biritz, V. A. Okorokov, W. L. Zhan, T. G. Dedovich, S. Margetis, R. F. Clarke, J. Schambach, Morton Kaplan, T. Sakuma, Frank Simon, X. Z. Cai, S. C. Phatak, Y. Fisyak, B. V.K.S. Potukuchi, Yu-Gang Ma, S. Baumgart, J. W. Harris, J. H. Chen, M. Bystersky, M. Pachr, R. E. Tribble, B. Haag, David Jonathan Hofman, Anthony R. Timmins, Sergey Timoshenko, P. Yepes, Gerald W Hoffmann, A. Stadnik, S. Bueltmann, M. DePhillips, Peter Martin Jacobs, A. H. Tang, J. Takahashi, Y. J. Sun, S. B. Nurushev, V. Emelianov, Zebo Tang, Michal Sumbera, G. Van Buren, S. Kabana, Y. Bai, S. S. Shi, I. A. Qattan, T. W. Ludlam, Z. Chajecki, J. M. Nelson, A. K. Bhati, D. Keane, S. W. Wissink, Y. P. Viyogi, Yan Li, W. Peryt, Y. Zhang, C. Perkins, T. Peitzmann, Nikola Poljak, Nikolai Smirnov, Xuan Wang, A. Ogawa, H. F. Chen, Thomas A. Trainor, W. R. Edwards, R. Stock, J. Mitchell, I. K. Yoo, D. R. Gangadharan, E. G. Judd, L. G. Efimov, C-H. Lee, T. K. Nayak, Y. Panebratsev, D. Grosnick, V. Kouchpil, B. E. Bonner, O. D. Tsai, M. Elnimr, M. C. Cervantes, Sevil Salur, Y. Wang, J. S. Wang, C. Nepali, Jorn Henning Putschke, A. V. Brandin, H. Okada, S. E. Vigdor, Christian Claude Kuhn, H. Zhang, I. Sakrejda, J. X. Zuo, S. LaPointe, A. Gordon, P. Fachini, K. S.F.F. Guimaraes, Jana Bielcikova, P. Sorensen, X. H. Shi, Peter Graham Jones, L. Didenko, S. R. Klein, T. Tarnowsky, N. L. Subba, D. L. Olson, A. A. Derevschikov, and A. L. Trattner

Subjects
Nuclear reaction, Particle physics, Star, General Physics and Astronomy, 01 natural sciences, Anisotropic Flow, Nuclear physics, Au+Au and Cu+Cu collisions, 0103 physical sciences, Dependence, 010306 general physics, Nuclear Experiment, Physics, Energy, Time projection chamber, Nucleus-Nucleus Collisions, 010308 nuclear & particles physics, Elliptic flow, Collective Flow, Collision, Collaboration, Charged particle, NATURAL SCIENCES. Physics, PRIRODNE ZNANOSTI. Fizika, Elliptic Flow, Pseudorapidity, Time Projection Chamber, Transverse momentum, Quark-Gluon Plasma, High Energy Physics::Experiment, Relativistic Heavy Ion Collider
Abstract

We measure directed flow (v_{1}) for charged particles in Au+Au and Cu+Cu collisions at sqrt[s_{NN}]=200 and 62.4 GeV, as a function of pseudorapidity (eta), transverse momentum (p_{t}), and collision centrality, based on data from the STAR experiment. We find that the directed flow depends on the incident energy but, contrary to all available model implementations, not on the size of the colliding system at a given centrality. We extend the validity of the limiting fragmentation concept to v_{1} in different collision systems, and investigate possible explanations for the observed sign change in v_{1}(p_{t}).

Published
2008

44. Distributions of Charged Hadrons Associated with High Transverse Momentum Particles inppandAu+AuCollisions atsNN=200 GeV

Author

S. Mahajan, V. Ghazikhanian, Q. Li, J. L. Romero, R. Willson, D. G. Underwood, Lijuan Ruan, E. Finch, Sergey Voloshin, L. C. Bland, Q. J. Liu, K. J. Foley, C. A. Whitten, A. Tai, G. Sood, C-Q. Li, A. K. Dubey, J. Amonett, T. J. Hallman, M. J. Mora-Corral, X. L. Wang, P. Sorensen, B. I. Bezverkhny, E. Sugarbaker, D. Thein, G. Eppley, Xu Cai, T. J. M. Symons, J. Pluta, J. Klay, B. D. Anderson, A. A. Kuznetsov, Souvik Das, R. E. Tribble, Gerald W Hoffmann, R. P. Scharenberg, M. Heinz, Lee Stuart Barnby, R. Witt, O. A. Grachov, X. Dong, B. Yuting, S. Lange, A. Bravar, H. S. Matis, S. K. Pal, L. Liu, J. Baudot, Olivier Ravel, M. Kopytine, J. Fu, Z. P. Zhaomin, G. Van Buren, V. Emelianov, A. K. Bhati, D. Keane, S. Gronstal, R. S. Longacre, A. Billmeier, S. J. Lindenbaum, K. Schweda, Y. V. Zanevski, Z. P. Zizong, V. Yu Khodyrev, Nikolai Smirnov, R. Stock, J. Mitchell, L. G. Efimov, F. Meissner, M. Tokarev, J. G. Cramer, J. Balewski, Rashmi Raniwala, W. W. Jacobs, R. Fatemi, T. K. Nayak, B. K. Srivastava, I. M. Vasilevski, Claude Andre Pruneau, T. W. Ludlam, N. Xu, P. Filip, E. Hjort, C. O. Blyth, R.Kh. Kutuev, C. Roy, A. N. Zubarev, J. Berger, Debasish Das, Raghunath Sahoo, K. Krueger, J. Gans, S. Bhardwaj, T. Ullrich, Boris Hippolyte, J. M. Nelson, T. D. S. Stanislaus, J. Lauret, Y. Panebratsev, R. Zoulkarneev, G. D. Westfall, G. Rakness, R. Picha, D. Grosnick, A. Stolpovsky, D. A. Morozov, J. Carroll, H. H. Wieman, S. Kabana, M. Kramer, O. G. Grebenyuk, W. Peryt, G. Igo, J. Zoulkarneeva, M. Vznuzdaev, B. Norman, C. Perkins, G. Rai, S. V. Razin, Joseph Adams, Malgorzata Anna Janik, P. Fachini, S. K. Nayak, R. Wells, L. K. Mangotra, R. Manweiler, L. Gaudichet, L. Molnar, H. G. Ritter, V. B. Dunin, J. Kiryluk, R. L. Ray, E. Potrebenikova, T. Peitzmann, P. Seyboth, Z. Xu, A. Klyachko, L. Kotchenda, D. Magestro, J. W. Harris, Z. Z. Xu, T. J. Humanic, M. Cherney, Thomas Michael Cormier, A. Ridiger, Thorsten Sven Kollegger, Jay Roberts, Anik Gupta, W. Christie, R. V. Cadman, N.D. Gagunashvili, T. Ljubicic, R. Bellwied, M. R. Dutta Majumdar, Yaguo Wang, A. M. Poskanzer, E. G. Judd, S. Heppelmann, H. Ward, V. V. Belaga, D. Flierl, Jianhong Wu, W. A. Love, H. Caines, Sudhir Raniwala, I.A. Savin, Frank Jm Geurts, C. L. Kunz, A. I. Kulikov, G. Skoro, N. T. Porile, Sukalyan Chattopadhyay, G. J. Kunde, P. Yepes, V. Eckardt, T. Dietel, Vladimir Petrov, Renaud Vernet, M. S. Ganti, L. Martin, Andre Mischke, W. M. Zhang, Andrey Vasiliev, C. F. Moore, F. Retiere, Peter Martin Jacobs, S. P. Chernenko, B. E. Bonner, J. Engelage, W. J. Llope, P. Chaloupka, N. Schmitz, Mirko Planinic, D. D. Koetke, J. E. Draper, C. J. McClain, J. E. Gonzalez, N. G. Minaev, M. Shao, Peter Graham Jones, Bedangadas Mohanty, W. T. Waggoner, E. Shahaliev, R. Varma, O. D. Tsai, J. C. Dunlop, V. Perevoztchikov, M. A. C. Lamont, S. B. Nurushev, Z. Milosevich, K. Filimonov, E. W. Hughes, R. N. Singaraju, A. P. Meschanin, Yu A. Matulenko, John N. Wood, L. Didenko, F. Laue, A. Szanto de Toledo, A. Rose, Vitaly Okorokov, Zubayer Ahammed, M. J. LeVine, A. H. Tang, B. Lasiuk, Guy Paic, M. Horsley, Janet Elizabeth Seger, Premomoy Ghosh, C. Mironov, J. P. Coffin, O. V. Rogachevski, A. Chikanian, S. S. Shimanskii, Y. Fisyak, H. Long, Sergey Panitkin, B. Stringfellow, Ian Johnson, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, T. Pawlak, T. S. McShane, S. K. Badyal, D. K. Mishra, Manish Sharma, T. W. Henry, J. M. Landgraf, Z. Liu, Sevil Salur, Pawan Kumar Netrakanti, Adam Ryszard Kisiel, M. Lopez-Noriega, A. Boucham, D. P. Mahapatra, L. S. Schroeder, D. Arkhipkin, S. R. Klein, J. Porter, R. Lednický, H. J. Crawford, V. A. Nikitin, Yu Chen, S. Bekele, J. Speltz, O. Barannikova, D. L. Olson, K. E. Shestermanov, M. Strikhanov, P. A. Żołnierczuk, C. A. Gagliardi, A. A. Derevschikov, Morton Kaplan, T. Herston, Michal Sumbera, G. Renault, J. N. Marx, A. Ishihara, Christina Markert, J. Sandweiss, Sergey Timoshenko, B. V.K.S. Potukuchi, Yu-Gang Ma, A. Lebedev, C. Suire, Madan M. Aggarwal, A. S. Hirsch, M. M. de Moura, Fuqiang Wang, M. Oldenburg, H. Jiang, Y. P. Viyogi, V. Faine, P. Kravtsov, C. Adler, Basanta Kumar Nandi, J. Castillo, S. W. Wissink, C. Struck, V. I. Yurevich, M. Botje, J. Takahashi, A. M. VanderMolen, J. Putschke, J. W. Watson, Frank Simon, G. Wang, Jeffrey G. Reid, J. Sowinski, A. Ogawa, Shengli Huang, Thomas A. Trainor, D. Reichhold, A. I. Pavlinov, F. Liu, M. B. Tonjes, V. Morozov, T. D. Gutierrez, D. Hardtke, R. D. Majka, Z. M. Wang, S. Margetis, J. Schambach, H. Z. Huang, B. Erazmus, A. Kumar, F. Du, I. Sakrejda, Alexander Kovalenko, L. V. Nogach, V. I. Kravtsov, J. H. Thomas, Zhenyu Zhang, G. S. Averichev, D. Cebra, W. Shao, H. M. Spinka, S. Trentalange, M. Estienne, Yu Melnick, M. L. Miller, R.J.M. Snellings, S. C. Phatak, H. Bichsel, G. Odyniec, M. Potekhin, P. Szarwas, Julien Faivre, A. V. Brandin, David Lynn, J. C. Webb, S. E. Vigdor, Christian Claude Kuhn, B. Surrow, A. Hamed, J. G. Ma, E. Yamamoto, Marcelo Gameiro Munhoz, D. J. Prindle, H. Zhang, M. A. Lisa, W. J. Dong, Hao-Ze Chen, and M. Calderon De La Barca Sanchez

Subjects
Physics, Quantum chromodynamics, Energy loss, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, General Physics and Astronomy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Transverse momentum, Perpendicular, High Energy Physics::Experiment, Multiplicity (chemistry), Atomic physics, Nuclear Experiment, 010306 general physics, Jet quenching
Abstract

Charged hadrons in 0.15 4 GeV/c are reconstructed in pp and Au+Au collisions at {radical}(s{sub NN})=200 GeV. The associated multiplicity and p{sub perpendicular} magnitude sum are found to increase from pp to central Au+Au collisions. The associated p{sub perpendicular} distributions, while similar in shape on the nearside, are significantly softened on the awayside in central Au+Au relative to pp and not much harder than that of inclusive hadrons. The results, consistent with jet quenching, suggest that the awayside fragments approach equilibration with the medium traversed.

Published
2005

45. Extensive Particle Identification with TPC and TOF at the STAR Experiment

Author

Lijuan Ruan, O. Barannikova, Zhongbin Xu, Y. Fisyak, Paul Sorensen, Ming Shao, and X. Dong

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Time projection chamber, Physics::Instrumentation and Detectors, Hadron, Detector, FOS: Physical sciences, Electron, Spectral line, Particle identification, Nuclear physics, Deuterium, Particle, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation
Abstract

Particle identification (PID) capabilities are studied by using the Time Projection Chamber (TPC) and a Time-Of-Flight (TOF) detector together at STAR. The identification capability of charged hadrons is greatly extended compared with that achieved by TPC and TOF separately. Particle spectra from p+p, d+Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV and Au+Au collisions at $\sqrt{s_{_{NN}}}=62.4$ GeV are used to develop the methods. The transverse momentum ($p_T$) ranges of $\pi$, and $p(\bar{p})$ identification are from $\sim0.3$ GeV/$c$ to $\sim10$ GeV/$c$. The high $p_T$ reach is limited by statistics in current data sets. An important conceptual advance was developed to identify electrons by using a combination of dE/dx in TPC and velocity information from the TOF detectors, which is important for future low-mass dilepton program at STAR., Comment: 19 pages, 22 figures, 3 tables, submitted to NIM A

Published
2005

46. Photon and neutral pion production inAu+Aucollisions atsNN=130GeV

Author

B. D. Anderson, G. Eppley, Xu Cai, Marcelo Gameiro Munhoz, D. J. Prindle, J. Pluta, Madan M. Aggarwal, Fuqiang Wang, V. V. Belaga, R. E. Tribble, Gerald W Hoffmann, N. Xu, P. Filip, H. Zhang, Vladimir Petrov, E. Yamamoto, T. Dietel, A. K. Dubey, Souvik Das, D. Mishra, R. Witt, M. A. Lisa, A. Stolpovsky, Mirko Planinic, A. Kumar, B. Choi, L. Kotchenda, E. Sugarbaker, A. Lebedev, B. I. Bezverkhny, S. P. Chernenko, W. J. Llope, Sergey Voloshin, Subrata Pal, B. K. Srivastava, P. Seyboth, M. D. Trivedi, K. J. Foley, M. Oldenburg, M. Kaneta, P. Sorensen, F. Du, Peter Graham Jones, V. I. Yurevich, C. O. Blyth, Frank Simon, M. Castro, O. A. Grachov, X. Dong, A. Bravar, A. Rose, Rama Narayana Singaraju, T. W. Henry, G. D. Westfall, J. Gans, Hao-Ze Chen, S. Bhardwaj, Boris Hippolyte, A. H. Tang, Guy Paic, A. Chikanian, S. S. Shimanskii, Michal Sumbera, G. Renault, Alexander Kovalenko, L. V. Nogach, W. Christie, M. Heinz, Lee Stuart Barnby, F. Meissner, Y. Panebratsev, A. I. Kulikov, B. Lasiuk, J. C. Dunlop, D. Grosnick, C-Q. Li, Malgorzata Anna Janik, G. Rai, I. Sakrejda, J. Baudot, M. Calderon De La Barca Sanchez, C. Suire, A. Billmeier, J. G. Cramer, B. Erazmus, V. Faine, W. M. Zhang, Andrey Vasiliev, Zubayer Ahammed, Y. V. Zanevski, Sukalyan Chattopadhyay, B. Norman, M. Shao, H. Long, V. Grigoriev, J. Castillo, M. J. LeVine, R. P. Scharenberg, L. C. Bland, S. W. Wissink, L. Didenko, S. M. Guertin, M. Botje, A. A.P. Suaide, H. S. Matis, Janet Elizabeth Seger, J. Adams, R. L. Ray, E. Potrebenikova, S. K. Badyal, A. Boucham, D. Arkhipkin, D. P. Mahapatra, D. Cebra, Yu Chen, S. Trentalange, Matthew J. Anderson, W. W. Jacobs, D. Reichhold, A. I. Pavlinov, M. Estienne, W. A. Love, L. S. Schroeder, Zhenyu Zhang, F. Liu, M. B. Tonjes, V. Morozov, F. Retiere, Yu Melnick, M. M. de Moura, J. Lauret, S. Bekele, M. L. Miller, T. Ljubicic, V. A. Nikitin, S. V. Razin, M. S. Ganti, A. A. Kuznetsov, V. M. Leontiev, Olivier Ravel, S. Mahajan, A. Ridiger, Thorsten Sven Kollegger, J. Engelage, N. G. Minaev, H. Y. Zhang, Q. Li, D. Magestro, H. Caines, Sudhir Raniwala, L. Molnar, L. Gaudichet, J. Kiryluk, M. Kramer, K. E. Shestermanov, S. Stanislaus, T. D. Gutierrez, D. Hardtke, A. Tai, R. D. Majka, G. Sood, Z. M. Wang, John N. Wood, S. Heppelmann, T. S. McShane, Vitaly Okorokov, G. Rakness, C. Roy, Jay Roberts, H. Ward, H. Bichsel, G. Odyniec, S. Margetis, J. Schambach, Zhongyukun Xu, H. M. Spinka, P. Bhaskar, D. Flierl, Premomoy Ghosh, J. Amonett, L. Martin, J. Klay, Lianshou Liu, G. Skoro, C. Mironov, M. Germain, C. L. Kunz, C. P. Lansdell, C. A. Whitten, J. M. Landgraf, Z. Liu, B. V.K.S. Potukuchi, M. J. Mora-Corral, M. Potekhin, Y. Fisyak, V. Emelianov, Ian Johnson, Yu-Gang Ma, P. Szarwas, C. F. Moore, J. Balewski, Rashmi Raniwala, A. Klyachko, A. K. Bhati, R.J.M. Snellings, D. Keane, M. Strikhanov, S. Gronstal, J. H. Thomas, S. Lange, E. G. Judd, D. D. Koetke, J. E. Draper, S. C. Phatak, Claude Andre Pruneau, Nikolai Smirnov, David Lynn, Vladimir Tikhomirov, C. A. Gagliardi, S. J. Lindenbaum, H. G. Ritter, P.A. Zolnierczuk, R. Stock, J. Mitchell, T. Herston, H. Z. Huang, R. Lednický, P. Chaloupka, L. G. Efimov, J. E. Gonzalez, R. Bellwied, Bedangadas Mohanty, Christina Markert, J. Sandweiss, A. S. Konstantinov, T. Ullrich, J. P. Coffin, O. V. Rogachevski, R. Zoulkarneev, T. K. Nayak, V. Perevoztchikov, V. Trofimov, C. Struck, G. S. Averichev, Julien Faivre, K. Filimonov, B. E. Bonner, A. Ishihara, M. Lopez-Noriega, S. Kabana, Y. P. Viyogi, J. Takahashi, J. Putschke, T. J. Humanic, O. D. Tsai, J. G. Ma, S. U. Pandey, A. E. Yakutin, A. V. Brandin, J. W. Harris, Basanta Kumar Nandi, I.A. Savin, N. T. Porile, Sergey Panitkin, J. W. Watson, J. Marx, M. Guedon, A. M. VanderMolen, E. Gushin, G. J. Kunde, P. Yepes, V. Eckardt, S. E. Vigdor, M. A. Vasiliev, Yu A. Matulenko, M. Horsley, Christian Claude Kuhn, A. Ogawa, B. Stringfellow, Shengli Huang, Thomas A. Trainor, B. Surrow, Sevil Salur, A. S. Hirsch, P. Kravtsov, C. Adler, Jeffrey G. Reid, J. Sowinski, N.D. Gagunashvili, D. Thein, R. Wells, G. Van Buren, M. Kopytine, J. Fu, M. Tokarev, T. W. Ludlam, H. H. Wieman, L. K. Mangotra, R. Manweiler, M. R. Dutta Majumdar, J. M. Nelson, A. M. Poskanzer, N. Schmitz, E. Shahaliev, W. Peryt, V. Ghazikhanian, J. L. Romero, D. Seliverstov, E. Finch, I. Zborovský, X. L. Wang, P. Fachini, Peter Martin Jacobs, E. Hjort, J. Carroll, Gang Wang, S. K. Nayak, M. A. C. Lamont, S. B. Nurushev, Z. Milosevich, Z. Xu, A. P. Meschanin, Anik Gupta, R. V. Cadman, Jianhong Wu, Manish Sharma, Morton Kaplan, Frank Jm Geurts, R. S. Longacre, Debasish Das, Raghunath Sahoo, G. Igo, J. Zoulkarneeva, W. T. Waggoner, K. Schweda, Adam Ryszard Kisiel, H. J. Crawford, R. Fatemi, K. Krueger, A. N. Zubarev, R. Picha, M. Messer, M. Cherney, Thomas Michael Cormier, P. Nevski, F. Laue, A. Szanto de Toledo, T. Pawlak, Jinghui Yang, J. Porter, R.Kh. Kutuev, S. R. Klein, J. Berger, O. Barannikova, D. L. Olson, A. A. Derevschikov, V. B. Dunin, R. Willson, D. G. Underwood, Lijuan Ruan, Q. J. Liu, T. J. Hallman, and T. J. M. Symons

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Meson, 010308 nuclear & particles physics, 01 natural sciences, Particle identification, Spectral line, Nuclear physics, Particle decay, Positron, Pion, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, 010306 general physics
Abstract

We report inclusive photon measurements about midrapidity (\y\ gammagamma decay channel. The fractional contribution of the pi(0)-->gammagamma decay to the inclusive photon spectrum decreases by 20%+/-5% between p(t)=1.65 GeV/c and p(t)=2.4 GeV/c in the most central events, indicating that relative to pi(0)-->gammagamma decay the contribution of other photon sources is substantially increasing.

Published
2004

47. Particle-Type Dependence of Azimuthal Anisotropy and Nuclear Modification of Particle Production inAu+AuCollisions atsNN=200 GeV

Author

A. Tai, R. L. Ray, E. Potrebenikova, G. Sood, J. Amonett, J. Klay, I. Sakrejda, T. Ljubicic, V. Emelianov, A. Lebedev, A. K. Bhati, T. J. Humanic, D. Keane, S. Gronstal, H. Caines, Sudhir Raniwala, M. M. de Moura, I.A. Savin, N. T. Porile, Nikolai Smirnov, R. Stock, J. Mitchell, L. G. Efimov, M. Botje, M. L. Miller, T. K. Nayak, Yu A. Matulenko, B. E. Bonner, O. D. Tsai, P. Szarwas, A. K. Dubey, Zhenyu Zhang, A. Ishihara, J. Marx, M. Horsley, B. Stringfellow, Z. Xu, Souvik Das, R. Witt, V. Yu Khodyrev, J. C. Dunlop, M. A. Vasiliev, Zubayer Ahammed, M. J. LeVine, S. K. Badyal, L. S. Schroeder, Anik Gupta, J. Balewski, Rashmi Raniwala, D. Reichhold, F. Retiere, A. Billmeier, B. K. Srivastava, J. Gans, S. Bhardwaj, Boris Hippolyte, H. Jiang, M. Heinz, Lee Stuart Barnby, Claude Andre Pruneau, J. G. Cramer, B. Erazmus, R. V. Cadman, A. Stolpovsky, A. I. Pavlinov, F. Liu, M. B. Tonjes, T. Ullrich, S. V. Razin, L. Gaudichet, J. Kiryluk, N. G. Minaev, L. K. Mangotra, Jianhong Wu, F. Laue, A. Szanto de Toledo, V. V. Belaga, Basanta Kumar Nandi, Jay Roberts, V. Morozov, C. L. Kunz, L. Kotchenda, C. F. Moore, Sevil Salur, R. Zoulkarneev, R. Manweiler, L. C. Bland, S. Kabana, R. Wells, E. Yamamoto, C. P. Lansdell, T. Pawlak, D. Cebra, R.J.M. Snellings, Frank Jm Geurts, M. Kramer, T. S. McShane, A. M. Poskanzer, S. Trentalange, S. C. Phatak, M. Guedon, A. M. VanderMolen, T. D. Gutierrez, D. Hardtke, R. D. Majka, M. Estienne, C. Roy, J. Porter, M. Castro, Joseph Adams, C. O. Blyth, Z. M. Wang, Yu Melnick, S. Margetis, J. Schambach, H. Bichsel, G. Odyniec, P. Bhaskar, W. A. Love, B. I. Bezverkhny, M. R. Dutta Majumdar, D. Magestro, Y. Panebratsev, D. Grosnick, Peter Graham Jones, A. Klyachko, W. Christie, V. A. Nikitin, Zhongyukun Xu, M. Potekhin, R. Willson, D. G. Underwood, O. A. Grachov, K. E. Shestermanov, X. Dong, Lijuan Ruan, M. D. Trivedi, A. Bravar, A. I. Kulikov, Masashi Kaneta, W. T. Waggoner, G. Rai, David Lynn, Madan M. Aggarwal, D. Thein, C. A. Whitten, W. M. Zhang, Andrey Vasiliev, Fuqiang Wang, Vladimir Tikhomirov, D. Mishra, G. Skoro, N. Schmitz, M. Shao, G. Rakness, Y. P. Viyogi, Q. J. Liu, B. Norman, E. Shahaliev, M. Oldenburg, P. Chaloupka, M. Kopytine, J. Fu, M. J. Mora-Corral, S. M. Guertin, M. Tokarev, Janet Elizabeth Seger, T. J. Hallman, T. J. M. Symons, V. Ghazikhanian, L. Didenko, Matthew J. Anderson, Alexandre Alarcon Do Passo Suaide, K. Schweda, Adam Ryszard Kisiel, J. G. Ma, A. H. Tang, B. V.K.S. Potukuchi, V. I. Yurevich, Yu-Gang Ma, J. H. Thomas, S. Lange, Vladimir Petrov, Guy Paic, A. Chikanian, S. S. Shimanskii, J. L. Romero, Julien Faivre, Marie Germain, A. A. Kuznetsov, H. J. Crawford, A. V. Brandin, P. Seyboth, Sergey Voloshin, S. J. Lindenbaum, Frank Simon, Marcelo Gameiro Munhoz, D. P. Mahapatra, D. J. Prindle, S. P. Chernenko, R.Kh. Kutuev, J. Berger, N. Xu, P. Filip, Yu Chen, W. J. Llope, K. J. Foley, E. Finch, J. Engelage, H. H. Wieman, R. Fatemi, H. Zhang, John N. Wood, Olivier Ravel, Vitaly Okorokov, A. Boucham, A. P. Meschanin, R. Lednický, D. Arkhipkin, A. Kumar, B. Choi, A. N. Zubarev, I. Zborovský, K. Krueger, M. A. Lisa, A. Rose, Rama Narayana Singaraju, Premomoy Ghosh, X. L. Wang, S. Bekele, G. D. Westfall, J. M. Landgraf, Z. Liu, F. Du, W. J. Dong, E. G. Judd, S. E. Vigdor, Christian Claude Kuhn, J. Baudot, R. Picha, C. Perkins, E. Hjort, B. Lasiuk, M. Messer, H. Long, Malgorzata Anna Janik, Y. V. Zanevski, V. B. Dunin, Alexander Kovalenko, L. V. Nogach, M. Cherney, M. Strikhanov, B. Surrow, J. Carroll, C. A. Gagliardi, Thomas Michael Cormier, S. K. Nayak, G. S. Averichev, T. Herston, V. I. Kravtsov, P. Nevski, P. Fachini, J. E. Gonzalez, Bedangadas Mohanty, Christina Markert, J. Sandweiss, V. Trofimov, Manish Sharma, R. S. Longacre, A. S. Hirsch, P. Kravtsov, C. Adler, Debasish Das, Raghunath Sahoo, M. Lopez-Noriega, H. M. Spinka, Jeffrey G. Reid, S. R. Klein, G. Igo, J. Zoulkarneeva, P. A. Żołnierczuk, J. Sowinski, O. Barannikova, D. L. Olson, Michal Sumbera, G. Renault, A. A. Derevschikov, C. Mironov, Morton Kaplan, Y. Fisyak, C. Suire, P. Sorensen, Ian Johnson, G. Van Buren, V. Faine, J. Castillo, S. W. Wissink, T. W. Ludlam, H. G. Ritter, J. M. Nelson, H. Z. Huang, R. Bellwied, W. Peryt, N.D. Gagunashvili, Sukalyan Chattopadhyay, D. Seliverstov, M. S. Ganti, Peter Martin Jacobs, V. Perevoztchikov, K. Filimonov, Sergey Panitkin, Gang Wang, A. Ridiger, Thorsten Sven Kollegger, M. A. C. Lamont, S. B. Nurushev, Z. Milosevich, S. Heppelmann, D. Flierl, L. Martin, D. D. Koetke, J. E. Draper, J. P. Coffin, O. V. Rogachevski, E. Sugarbaker, J. W. Harris, F. Meissner, Lianshou Liu, D. A. Morozov, E. Gushin, G. J. Kunde, P. Yepes, V. Eckardt, C. Struck, J. Takahashi, G. Eppley, J. Putschke, J. W. Watson, Xu Cai, J. Pluta, A. Ogawa, R. E. Tribble, Shengli Huang, Thomas A. Trainor, Gerald W Hoffmann, C-Q. Li, Susanta Kumar Pal, R. P. Scharenberg, S. U. Pandey, Hao-Ze Chen, H. S. Matis, M. Calderon De La Barca Sanchez, B. D. Anderson, W. W. Jacobs, S. Mahajan, Q. Li, J. Lauret, L. Molnar, S. Stanislaus, H. Ward, T. Dietel, Mirko Planinic, T. W. Henry, and V. Grigoriev

Subjects
Quantum chromodynamics, Physics, High Energy Physics::Phenomenology, Hadron, Elliptic flow, General Physics and Astronomy, Parton, Lambda, Baryon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Anisotropy, Scaling
Abstract

We present STAR measurements of the azimuthal anisotropy parameter v{sub 2} and the binary-collision scaled centrality ratio R{sub CP} for kaons and lambdas ({Lambda} + {bar {Lambda}}) at mid-rapidity in Au+Au collisions at {radical}s{sub NN} = 200 GeV. In combination, the v{sub 2} and R{sub CP} particle-type dependencies contradict expectations from partonic energy loss followed by standard fragmentation in vacuum. We establish p{sub T} {approx} 5 GeV/c as the value where the centrality dependent baryon enhancement ends. The K{sub S}{sup 0} and {Lambda} + {bar {Lambda}} v{sub 2} values are consistent with expectations of constituent-quark-number scaling from models of hadron formation by parton coalescence or recombination.

Published
2004

48. Azimuthal anisotropy at the relativistic heavy ion collider: The first and fourth harmonics

Author

R. Wells, M. Castro, M. R. Dutta Majumdar, I. Sakrejda, G. Eppley, J. Engelage, John N. Wood, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, H. Bichsel, G. Odyniec, V. Trofimov, Xu Cai, J. Pluta, D. P. Mahapatra, Zhongyukun Xu, M. Potekhin, Hao-Ze Chen, N. Schmitz, M. Calderon De La Barca Sanchez, E. Sugarbaker, E. Shahaliev, M. L. Miller, Yu Chen, David Lynn, Premomoy Ghosh, J. M. Landgraf, Z. Liu, K. Schweda, P. Szarwas, T. S. McShane, Zhenyu Zhang, C-Q. Li, R. P. Scharenberg, D. Seliverstov, R. E. Tribble, F. Meissner, S. Mahajan, J. G. Ma, P. A. Żołnierczuk, Q. Li, Joseph Adams, M. Strikhanov, Peter Martin Jacobs, C. Roy, H. M. Spinka, Gerald W Hoffmann, H. S. Matis, Michal Sumbera, G. Renault, V. A. Nikitin, C. Suire, Gang Wang, Marcelo Gameiro Munhoz, D. Magestro, I. Zborovský, D. J. Prindle, X. L. Wang, C. P. Lansdell, R.J.M. Snellings, R. N. Singaraju, W. W. Jacobs, V. Faine, H. Zhang, K. E. Shestermanov, A. P. Meschanin, M. A. C. Lamont, S. B. Nurushev, Z. Milosevich, S. C. Phatak, D. A. Morozov, M. A. Lisa, J. Lauret, E. Yamamoto, J. W. Harris, E. Hjort, J. Castillo, G. Skoro, C. Perkins, W. J. Dong, Christina Markert, S. W. Wissink, D. Thein, J. Sandweiss, A. Klyachko, L. Molnar, S. Stanislaus, M. Kopytine, J. Fu, H. Ward, B. V.K.S. Potukuchi, Yu-Gang Ma, A. Ridiger, Thorsten Sven Kollegger, S. V. Razin, Manish Sharma, Vladimir Petrov, J. Carroll, M. D. Trivedi, M. Tokarev, S. P. Chernenko, W. J. Llope, H. G. Ritter, S. K. Nayak, S. Heppelmann, H. Z. Huang, Lianshou Liu, D. Flierl, Sergey Voloshin, C. A. Gagliardi, Z. Xu, Y. P. Viyogi, Vladimir Tikhomirov, B. D. Anderson, Julien Faivre, V. Ghazikhanian, A. Rose, E. Gushin, G. J. Kunde, P. Yepes, V. Eckardt, Anik Gupta, L. Martin, Adam Ryszard Kisiel, R. Bellwied, K. J. Foley, A. V. Brandin, L. Gaudichet, T. Herston, C. O. Blyth, R. S. Longacre, M. Heinz, Lee Stuart Barnby, J. Kiryluk, B. Lasiuk, H. Long, R. V. Cadman, J. E. Gonzalez, Bedangadas Mohanty, D. D. Koetke, Jianhong Wu, A. Billmeier, C. Struck, H. J. Crawford, J. L. Romero, H. H. Wieman, J. Takahashi, J. Putschke, J. W. Watson, P. Chaloupka, J. G. Cramer, J. E. Draper, B. Norman, A. Kumar, B. Choi, F. Du, Debasish Das, Raghunath Sahoo, S. E. Vigdor, Christian Claude Kuhn, A. Ogawa, Shengli Huang, Thomas A. Trainor, Jay Roberts, Frank Jm Geurts, L. K. Mangotra, J. Baudot, J. P. Coffin, O. V. Rogachevski, Morton Kaplan, Y. V. Zanevski, Alexander Kovalenko, L. V. Nogach, A. H. Tang, Guy Paic, T. Dietel, E. Finch, G. Igo, J. Zoulkarneeva, Mirko Planinic, R. Fatemi, M. Lopez-Noriega, R. Manweiler, A. Chikanian, S. S. Shimanskii, B. Surrow, A. M. Poskanzer, V. I. Kravtsov, W. A. Love, K. Krueger, T. W. Henry, M. Kramer, C. L. Kunz, C. Mironov, D. K. Mishra, D. Reichhold, G. Rakness, A. Boucham, R. Picha, Y. Fisyak, D. Arkhipkin, P. Sorensen, L. C. Bland, S. Bekele, A. I. Pavlinov, W. T. Waggoner, E. G. Judd, Madan M. Aggarwal, Fuqiang Wang, C. F. Moore, M. Oldenburg, A. Ishihara, T. J. Humanic, M. Cherney, Ian Johnson, A. A. Kuznetsov, I.A. Savin, N. T. Porile, Thomas Michael Cormier, P. Nevski, H. Jiang, G. Van Buren, V. I. Yurevich, Basanta Kumar Nandi, Olivier Ravel, Frank Simon, V. A. Okorokov, M. Guedon, A. M. VanderMolen, F. Liu, M. B. Tonjes, Yu A. Matulenko, M. Horsley, A. K. Dubey, Souvik Das, T. W. Ludlam, J. M. Nelson, R. Witt, B. Stringfellow, P. Seyboth, W. Peryt, S. U. Pandey, V. Morozov, V. Yu Khodyrev, B. K. Srivastava, J. Gans, S. Bhardwaj, Boris Hippolyte, J. C. Dunlop, Zubayer Ahammed, M. J. LeVine, T. D. Gutierrez, D. Hardtke, S. K. Badyal, R. D. Majka, L. S. Schroeder, Z. M. Wang, S. Margetis, J. Schambach, W. Christie, A. I. Kulikov, Masashi Kaneta, W. M. Zhang, Andrey Vasiliev, M. Shao, Janet Elizabeth Seger, A. Lebedev, M. M. de Moura, M. Botje, N.D. Gagunashvili, Sukalyan Chattopadhyay, M. S. Ganti, V. Perevoztchikov, K. Filimonov, Sergey Panitkin, A. S. Hirsch, P. Kravtsov, C. Adler, Jeffrey G. Reid, J. Sowinski, V. Grigoriev, R. L. Ray, E. Potrebenikova, T. Ljubicic, H. Caines, Sudhir Raniwala, J. Balewski, Rashmi Raniwala, Claude Andre Pruneau, T. Ullrich, R. Zoulkarneev, S. Kabana, B. I. Bezverkhny, O. A. Grachov, X. Dong, A. Bravar, S. K. Pal, Matthew J. Anderson, J. H. Thomas, R. Lednický, G. S. Averichev, R. Willson, D. G. Underwood, Lijuan Ruan, Q. J. Liu, T. J. Hallman, T. J. M. Symons, R.Kh. Kutuev, J. Berger, F. Retiere, N. G. Minaev, V. B. Dunin, B. Erazmus, N. Xu, D. Cebra, S. Trentalange, P. Filip, M. Estienne, Yu Melnick, G. D. Westfall, Malgorzata Anna Janik, F. Laue, A. Szanto de Toledo, T. Pawlak, J. Porter, P. Bhaskar, C. A. Whitten, M. J. Mora-Corral, S. Lange, S. J. Lindenbaum, Marie Germain, A. N. Zubarev, M. Messer, P. Fachini, V. V. Belaga, Peter Graham Jones, L. Didenko, S. R. Klein, O. Barannikova, D. L. Olson, A. A. Derevschikov, Y. Panebratsev, D. Grosnick, G. Rai, A. Tai, G. Sood, J. Amonett, J. Klay, V. Emelianov, A. K. Bhati, D. Keane, S. Gronstal, Nikolai Smirnov, R. Stock, J. Mitchell, L. G. Efimov, T. K. Nayak, B. E. Bonner, O. D. Tsai, J. Marx, M. A. Vasiliev, Sevil Salur, A. Stolpovsky, L. Kotchenda, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and STAR

Subjects
Physics, Time projection chamber, 010308 nuclear & particles physics, Plane (geometry), Elliptic flow, General Physics and Astronomy, Particle accelerator, 01 natural sciences, law.invention, Nuclear physics, Azimuth, law, Harmonics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Atomic physics, time projection chamber, nuclear collisions, collective flow, star, energies, 010306 general physics, Anisotropy, Relativistic Heavy Ion Collider, Nuclear Experiment
Abstract

We report the first observations of the first harmonic (directed flow, v(1)) and the fourth harmonic (v(4)), in the azimuthal distribution of particles with respect to the reaction plane in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). Both measurements were done taking advantage of the large elliptic flow (v(2)) generated at RHIC. From the correlation of v(2) with v(1) it is determined that v(2) is positive, or in-plane. The integrated v(4) is about a factor of 10 smaller than v(2). For the sixth (v(6)) and eighth (v(8)) harmonics upper limits on the magnitudes are reported.

Published
2004

49. Net charge fluctuations inAu+Aucollisions atsNN=130GeV

Author

A. Stolpovsky, L. Kotchenda, P. Bhaskar, M. Castro, C. A. Whitten, R. S. Longacre, M. J. Mora-Corral, S. Lange, Anik Gupta, J. H. Thomas, Y. Panebratsev, S. M. Guertin, Jianhong Wu, Frank Jm Geurts, S. J. Lindenbaum, Debasish Das, Raghunath Sahoo, D. P. Mahapatra, D. Grosnick, G. Rai, G. Renault, R. Lednický, Yu Chen, N. Xu, P. Filip, G. Igo, J. Zoulkarneeva, M. Heinz, Lee Stuart Barnby, G. D. Westfall, Malgorzata Anna Janik, W. T. Waggoner, F. Retiere, V. V. Belaga, S. B. Nurushev, G. S. Averichev, N. G. Minaev, H. Bichsel, G. Odyniec, G. Rakness, A. Lebedev, D. Thein, A. H. Tang, P. Sorensen, C. Mironov, Y. Fisyak, Zhongyukun Xu, M. Potekhin, A. Ridiger, L. C. Bland, Peter Graham Jones, Guy Paic, A. Chikanian, S. S. Shimanskii, B. E. Bonner, Ian Johnson, J. Balewski, Rashmi Raniwala, Lianshou Liu, W. A. Love, O. D. Tsai, I. Sakrejda, M. Kopytine, J. Fu, J. Marx, E. G. Judd, L. Didenko, S. Heppelmann, H. M. Spinka, David Lynn, D. Flierl, Claude Andre Pruneau, M. Tokarev, Adam Ryszard Kisiel, M. Botje, T. Ullrich, M. L. Miller, A. A.P. Suaide, Vitaly Okorokov, Hao-Ze Chen, H. J. Crawford, M. A. Vasiliev, L. Martin, C. Struck, P. Szarwas, R. Zoulkarneev, A. Boucham, D. Reichhold, B. D. Anderson, Michal Sumbera, A. I. Pavlinov, Julien Faivre, Sevil Salur, A. A. Kuznetsov, A. S. Hirsch, H. H. Wieman, A. Tai, P. Kravtsov, F. Liu, M. B. Tonjes, D. Arkhipkin, A. V. Brandin, S. Kabana, C. Suire, G. Sood, R. Fatemi, J. Takahashi, J. Putschke, J. W. Watson, C. A. Gagliardi, V. Morozov, V. Faine, J. Amonett, C. Adler, T. Herston, D. D. Koetke, J. E. Draper, J. Klay, L. K. Mangotra, J. G. Ma, V. M. Leontiev, Olivier Ravel, P. Seyboth, S. E. Vigdor, Christian Claude Kuhn, A. P. Meschanin, J. Castillo, K. Krueger, M. Calderon De La Barca Sanchez, S. W. Wissink, S. Bekele, R. Manweiler, V. Trofimov, Matthew J. Anderson, D. Hardtke, V. Emelianov, A. K. Bhati, Sergey Voloshin, R. D. Majka, Jeffrey G. Reid, A. Ogawa, D. Keane, S. Gronstal, Shengli Huang, B. Surrow, H. Y. Zhang, Nikolai Smirnov, R. Stock, B. I. Bezverkhny, J. Mitchell, J. Sowinski, R. Picha, Z. M. Wang, S. Margetis, J. Schambach, A. M. Poskanzer, J. P. Coffin, O. V. Rogachevski, B. Erazmus, L. G. Efimov, M. M. Moura, O. A. Grachov, X. Dong, R. V. Cadman, K. Filimonov, C-Q. Li, A. Bravar, W. Christie, R. P. Scharenberg, A. Ishihara, H. S. Matis, T. K. Nayak, K. J. Foley, J. E. Gonzalez, A. I. Kulikov, Bedangadas Mohanty, D. Cebra, Vladimir Petrov, S. P. Chernenko, E. Yamamoto, S. Trentalange, Manish Sharma, S. V. Razin, W. M. Zhang, Andrey Vasiliev, L. Gaudichet, E. Sugarbaker, Jinghui Yang, W. W. Jacobs, J. Lauret, M. Cherney, M. Shao, Thomas Michael Cormier, W. J. Llope, A. Cardenas, Yu Melnick, M. D. Trivedi, Madan M. Aggarwal, J. Kiryluk, Fuqiang Wang, S. Mahajan, Q. Li, D. Mishra, M. Oldenburg, L. Molnar, S. R. Klein, Janet Elizabeth Seger, O. Barannikova, D. L. Olson, A. Rose, Rama Narayana Singaraju, Marcelo Gameiro Munhoz, D. J. Prindle, B. Lasiuk, P. Nevski, M. Lopez-Noriega, N.D. Gagunashvili, G. Eppley, Jay Roberts, H. G. Ritter, H. Z. Huang, Basanta Kumar Nandi, H. Ward, M. Kaneta, F. Meissner, Xu Cai, J. Pluta, T. Dietel, Mirko Planinic, J. Baudot, V. I. Yurevich, R. Bellwied, A. S. Konstantinov, Frank Simon, H. Zhang, H. Long, A. A. Derevschikov, Sukalyan Chattopadhyay, M. S. Ganti, T. Kolleger, M. A. Lisa, V. Grigoriev, S. Stanislaus, C. L. Kunz, T. W. Henry, E. Potrebenikova, Y. V. Zanevski, V. A. Nikitin, M. Guedon, A. M. VanderMolen, R. E. Tribble, J. Adams, K. E. Shestermanov, C. F. Moore, A. N. Zubarev, C. Roy, Gerald W Hoffmann, V. Perevoztchikov, M. Messer, T. Ljubicic, H. Caines, Sudhir Raniwala, M. Germain, V. L. Rykov, B. V.K.S. Potukuchi, A. Klyachko, Sergey Panitkin, Yu-Gang Ma, A. K. Dubey, Vladimir Tikhomirov, P. Chaloupka, Souvik Das, D. Magestro, R. Witt, G. Skoro, J. W. Harris, Subrata Pal, B. K. Srivastava, E. Gushin, G. J. Kunde, C. O. Blyth, P. Yepes, V. Eckardt, J. Gans, S. Bhardwaj, Boris Hippolyte, B. Norman, S. U. Pandey, A. E. Yakutin, J. Engelage, J. C. Dunlop, John N. Wood, Zubayer Ahammed, M. J. LeVine, Premomoy Ghosh, J. M. Landgraf, Z. Liu, T. D. Gutierrez, S. K. Badyal, M. Strikhanov, L. S. Schroeder, P.A. Zolnierczuk, Christina Markert, J. Sandweiss, T. S. McShane, Y. P. Viyogi, K. Schweda, R. Wells, T. J. Humanic, R.Kh. Kutuev, J. Berger, M. R. Dutta Majumdar, I.A. Savin, N. T. Porile, N. Schmitz, E. Shahaliev, I. Zborovský, F. Laue, A. Szanto de Toledo, X. L. Wang, E. Hjort, T. Pawlak, J. Porter, J. Carroll, S. K. Nayak, Yu A. Matulenko, M. Horsley, V. Ghazikhanian, B. Stringfellow, Zhongbin Xu, J. L. Romero, V. B. Dunin, G. Van Buren, A. Kumar, E. Finch, B. Choi, R. Willson, D. G. Underwood, Lijuan Ruan, A. Billmeier, F. Du, T. W. Ludlam, Q. J. Liu, Alexander Kovalenko, J. G. Cramer, J. M. Nelson, T. J. Hallman, T. J. M. Symons, L. V. Nogach, W. Peryt, D. Seliverstov, P. Fachini, Peter Martin Jacobs, Gang Wang, M. A. C. Lamont, Z. Milosevich, Zhenyu Zhang, M. Kramer, C. P. Lansdell, R.J.M. Snellings, S. C. Phatak, and Morton Kaplan

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Jet (particle physics), 01 natural sciences, 7. Clean energy, Resonance (particle physics), Charged particle, Hadronization, Nuclear physics, Pion, Pseudorapidity, 0103 physical sciences, Atomic physics, 010306 general physics, STAR detector
Abstract

We present the results of charged particle fluctuations measurements in Au+Au collisions at rootS(NN)=130 GeV using the STAR detector. Dynamical fluctuations measurements are presented for inclusive charged particle multiplicities as well as for identified charged pions, kaons, and protons. The net charge dynamical fluctuations are found to be large and negative providing clear evidence that positive and negative charged p article production is correlated within the pseudorapidity range investigated. Correlations are smaller than expected based on model-dependent predictions for a resonance gas or a quark-gluon gas which undergoes fast hadronization and freeze-out. Qualitative agreement is found with comparable scaled p+p measurements and a heavy ion jet interaction generation model calculation based on independent particle collisions, although a small deviation from the 1/N scaling dependence expected from this model is observed.

Published
2003

50. Transverse-Momentum and Collision-Energy Dependence of High-pTHadron Suppression inAu+AuCollisions at Ultrarelativistic Energies

Author

L. K. Mangotra, G. Eppley, Xu Cai, R. Manweiler, J. Pluta, A. Stolpovsky, L. Kotchenda, A. M. Poskanzer, F. Retiere, Zhenyu Zhang, A. Tai, N. G. Minaev, G. Sood, R. E. Tribble, M. Castro, J. Amonett, T. J. Humanic, Gerald W Hoffmann, J. Klay, H. Bichsel, V. Grigoriev, I.A. Savin, N. T. Porile, G. Odyniec, Marie Germain, V. Emelianov, A. K. Bhati, D. Keane, S. Gronstal, I. Sakrejda, R. L. Ray, E. Potrebenikova, Zhongyukun Xu, M. Potekhin, D. Thein, Nikolai Smirnov, R. Stock, J. Mitchell, M. Heinz, C. P. Lansdell, R.J.M. Snellings, S. C. Phatak, Lianshou Liu, C. O. Blyth, E. Sugarbaker, L. G. Efimov, Yu A. Matulenko, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, David Lynn, Lee Stuart Barnby, K. Filimonov, M. Horsley, Hao-Ze Chen, M. M. de Moura, J. C. Dunlop, T. Ljubicic, M. L. Miller, L. C. Bland, T. K. Nayak, R. S. Longacre, A. S. Hirsch, P. Kravtsov, C. Adler, B. Stringfellow, Jeffrey G. Reid, J. Sowinski, M. Kopytine, J. Fu, M. Tokarev, D. P. Mahapatra, F. Wang, A. N. Zubarev, Yu Chen, P. Szarwas, T. S. McShane, B. Norman, M. Messer, Zubayer Ahammed, Joseph Adams, M. Calderon De La Barca Sanchez, H. Caines, Sudhir Raniwala, M. J. LeVine, J. G. Ma, Debasish Das, A. A. Kuznetsov, Raghunath Sahoo, Y. P. Viyogi, V. L. Rykov, Y. Panebratsev, S. A. Voloshin, D. Grosnick, V. M. Leontiev, Olivier Ravel, P. Fachini, F. Laue, A. Szanto de Toledo, D. Magestro, Julien Faivre, N. Xu, P. Filip, S. K. Badyal, A. V. Brandin, F. Meissner, G. Rai, A. Kumar, B. Choi, G. Igo, F. Du, R. Wells, Marcelo Gameiro Munhoz, D. J. Prindle, C. Struck, B. D. Anderson, G. D. Westfall, G. Van Buren, L. S. Schroeder, J. Zoulkarneeva, H. H. Wieman, Alexander Kovalenko, W. A. Love, H. Zhang, T. Pawlak, L. V. Nogach, G. Skoro, M. A. Lisa, J. Takahashi, S. E. Vigdor, J. Putschke, Anik Gupta, R. V. Cadman, K. Schweda, Christian Claude Kuhn, S. V. Razin, Malgorzata Anna Janik, Jianhong Wu, J. Porter, J. W. Watson, B. E. Bonner, Jinghui Yang, J. Balewski, Rashmi Raniwala, L. Gaudichet, Frank Jm Geurts, J. Kiryluk, O. D. Tsai, J. Engelage, Claude Andre Pruneau, S. Mahajan, H. G. Ritter, Q. Li, A. Ogawa, Shengli Huang, Thomas A. Trainor, G. Renault, Jay Roberts, B. Erazmus, Madan M. Aggarwal, S. R. Klein, D. Mishra, M. Oldenburg, B. Surrow, J. Marx, John N. Wood, M. R. Dutta Majumdar, Premomoy Ghosh, A. Billmeier, J. G. Cramer, M. A. Vasiliev, H. Z. Huang, R. Bellwied, A. S. Konstantinov, T. W. Ludlam, J. M. Nelson, V. I. Yurevich, O. Barannikova, D. L. Olson, D. Cebra, C. L. Kunz, R. Willson, D. G. Underwood, C. F. Moore, Lijuan Ruan, T. Dietel, T. Ullrich, R. Zoulkarneev, P. Bhaskar, J. M. Landgraf, Z. Liu, M. Strikhanov, S. Trentalange, Yu Melnick, Mirko Planinic, A. A. Derevschikov, Sevil Salur, A. P. Meschanin, S. Kabana, K. J. Foley, C. A. Whitten, M. J. Mora-Corral, V. V. Belaga, Frank Simon, Matthew J. Anderson, T. W. Henry, N. Schmitz, Q. J. Liu, A. K. Dubey, Manish Sharma, Souvik Das, Christina Markert, J. Sandweiss, R. Witt, E. Yamamoto, S. Lange, P. Sorensen, A. Ridiger, Thorsten Sven Kollegger, C-Q. Li, M. Kramer, Peter Graham Jones, J. H. Thomas, S. J. Lindenbaum, W. Peryt, E. Shahaliev, R. P. Scharenberg, B. K. Srivastava, I. Zborovský, H. S. Matis, T. J. Hallman, X. L. Wang, T. J. M. Symons, J. Baudot, L. Didenko, S. Heppelmann, Susanta Kumar Pal, D. Flierl, J. Gans, S. Bhardwaj, Boris Hippolyte, R. Lednický, W. W. Jacobs, B. I. Bezverkhny, L. Martin, J. Lauret, M. D. Trivedi, C. A. Gagliardi, S. U. Pandey, A. E. Yakutin, L. Molnar, S. Stanislaus, T. Herston, O. A. Grachov, Y. V. Zanevski, K. A. Drees, X. Dong, J. E. Draper, A. Bravar, J. W. Harris, H. Ward, J. P. Coffin, O. V. Rogachevski, W. Waggoner, G. S. Averichev, E. Hjort, E. Gushin, G. J. Kunde, R.Kh. Kutuev, P. Yepes, V. Eckardt, J. Berger, V. B. Dunin, J. Carroll, H. M. Spinka, S. K. Nayak, Morton Kaplan, V. Ghazikhanian, Zhongbin Xu, J. L. Romero, D. Seliverstov, Peter Martin Jacobs, E. Finch, Gang Wang, M. A. C. Lamont, S. B. Nurushev, Z. Milosevich, C. Roy, V. Trofimov, C. Mironov, A. Klyachko, Y. Fisyak, Ian Johnson, V. A. Nikitin, K. E. Shestermanov, Vladimir Tikhomirov, B. V.K.S. Potukuchi, P. Chaloupka, Yu-Gang Ma, Vladimir Petrov, S. P. Chernenko, W. J. Llope, A. Rose, Rama Narayana Singaraju, B. Lasiuk, H. Long, Adam Ryszard Kisiel, A. H. Tang, H. J. Crawford, Guy Paic, A. Chikanian, R. Fatemi, K. Krueger, S. S. Shimanskii, P. Seyboth, R. Picha, M. Cherney, Thomas Michael Cormier, P. Nevski, A. Boucham, D. Arkhipkin, S. Bekele, G. Rakness, H. Y. Zhang, A. Ishihara, Basanta Kumar Nandi, E. G. Judd, V. A. Okorokov, J. E. Gonzalez, N.D. Gagunashvili, M. Guedon, A. M. VanderMolen, Bedangadas Mohanty, Sukalyan Chattopadhyay, M. S. Ganti, V. Perevoztchikov, Sergey Panitkin, A. Lebedev, M. Lopez-Noriega, P. A. Żołnierczuk, Michal Sumbera, C. Suire, V. Faine, J. Castillo, S. W. Wissink, M. Botje, W. Christie, A. I. Kulikov, Masashi Kaneta, W. M. Zhang, Andrey Vasiliev, M. Shao, Janet Elizabeth Seger, D. Reichhold, A. I. Pavlinov, F. Liu, M. B. Tonjes, V. Morozov, T. D. Gutierrez, D. Hardtke, R. D. Majka, Z. M. Wang, S. Margetis, and J. Schambach

Subjects
Nuclear physics, Physics, Quantum chromodynamics, Hadron, Transverse momentum, General Physics and Astronomy, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Collision
Abstract

We report high statistics measurements of inclusive charged hadron production in Au+Au and p+p collisions at rootS(NN)=200 GeV. A large, approximately constant hadron suppression is observed in central Au+Au collisions for 5

Published
2003

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