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6. On the Bogolubov’s chain of kinetic equations, the invariant subspaces and the corresponding Dirac type reduction

Author

Anatolij K. Prykarpatski, Yarema A. Prykarpatsky, and Radoslaw Antoni Kycia

Subjects
Physics, Dynamical systems theory, Chain (algebraic topology), Dirac (software), General Medicine, Invariant (mathematics), Type (model theory), Kinetic energy, Reduction (mathematics), Linear subspace, Mathematical physics
Abstract

We study a special class of dynamical systems of Boltzmann-Bogolubov and Boltzmann-Vlasov type on infinite dimensional functional manifolds modeling kinetic processes in manyparticle media. Based on geometric properties of the manyparticle phase space we succeded in dual analysing of the infinite Bogolubov hierarchy of manyparticle distribution functions and their Hamiltonian structure. Moreover, we proposed a new approach to invariant reducing the Bogolubov hierarchy on a suitably chosen correlation function constraint and deducing the related modified Boltzmann-Bogolubov kinetic equations on a finite set of multiparticle distribution functions.

Published
2021
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7. Entropy in Thermodynamics: from Foliation to Categorization

Author

Radoslaw Antoni Kycia

Subjects
contact structure, galois connection, General Mathematics, 02 engineering and technology, 01 natural sciences, Foliation, 010305 fluids & plasmas, Entropy (classical thermodynamics), thermodynamics, posets, 80-10, Categorization, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, QA1-939, 020201 artificial intelligence & image processing, Statistical physics, [MATH]Mathematics [math], entropy, ordering, Mathematics, 80a05
Abstract

We overview the notion of entropy in thermodynamics. We start from the smooth case using differential forms on the manifold, which is the natural language for thermodynamics. Then the axiomatic definition of entropy as ordering on a set that is induced by adiabatic processes will be outlined. Finally, the viewpoint of category theory is provided, which reinterprets the ordering structure as a category of pre-ordered sets.

Published
2021

10. An Explanation of the Landauer bound and its ineffectiveness with regard to multivalued logic

Author

Radoslaw Antoni Kycia and Agnieszka Niemczynowcz

Subjects
media_common.quotation_subject, Landauer's principle, Industrial chemistry, Second law of thermodynamics, Galois connection, 01 natural sciences, 010305 fluids & plasmas, Theoretical physics, Equilibrium thermodynamics, Encoding (memory), 0103 physical sciences, 010306 general physics, Entropy (arrow of time), Computer memory, media_common, Mathematics
Abstract

We discuss, using recent results on the thermodynamics of multivalued logic, the difficulties and pitfalls of how to apply the Landauer’s principle to thermodynamic computer memory models. The presentation is based on Szilard’s version of Maxwell’s demon experiment and use of equilibrium Thermodynamics. Different versions of thermodynamic/mechanical memory are presented – a one-hot encoding version and an implementation based on a reversed Szilard’s experiment. The relationship of the Landauer’s principle to the Galois connection is explained in detail.

Published
2020
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11. Introduction to Mathematical Modeling and Computer Simulations

Author

Vladimir Mityushev, Radoslaw Antoni Kycia, Wojciech Nawalaniec, Natalia Rylko, Vladimir Mityushev, Radoslaw Antoni Kycia, Wojciech Nawalaniec, and Natalia Rylko

Subjects
Computer simulation, Mathematical models
Abstract

Introduction to Mathematical Modeling and Computer Simulations, Second Edition continues to serve as an engaging and accessible textbook for undergraduates studying mathematical modeling and computer simulations. The book is heavily focussed on applications, and so may have a particular appeal to applied mathematicians, engineers, and others working in applied quantitative disciplines. The book may also be useful as a reference text for reference text for early-career stage practitioners. New to this Edition: A new chapter on Machine Learning and Data Analysis in order to account for recent developments in the field. Chapter 9, ‘Asymptotic Methods in Composites', has been entirely re-written to make it more consistent with industry and scientific standards. Includes an elementary introduction to programming in Python language. The Jupyter notebooks with examples for Chapter 10 and Appendix A are available for a download from www.Routledge.com/9781032661513.

Published
2024

12. Chemometric approach to characterization of the selected grape seed oils based on their fatty acids composition and FTIR spectroscopy

Author

Lidia Ślusarczyk, Patrik Burg, Radoslaw Antoni Kycia, Agnieszka Niemczynowicz, Bożena Gładyszewska, Mašán Vladimír, Arkadiusz Matwijczuk, and Dariusz Karcz

Subjects
Mathematics and computing, Science, wines, Article, edible oils, vegetable-oils, Fourier transform infrared spectroscopy, Cluster analysis, Grape seed, Mathematics, Multidisciplinary, Physics, Mixture model, Characterization (materials science), Environmental sciences, classification, transform-infrared-spectroscopy, Principal component analysis, authentication, Medicine, Fatty acid composition, virgin olive oils, Biological system, Food quality, Plant sciences, Biotechnology
Abstract

Addressing the issues arising from the production and trade of low-quality foods necessitates developing new quality control methods. Cooking oils, especially those produced from the grape seeds, are an example of food products that often suffer from questionable quality due to various adulterations and low-quality fruits used for their production. Among many methods allowing for fast and efficient food quality control, the combination of experimental and advanced mathematical approaches seems most reliable. In this work a method for grape seed oils compositional characterization based on the infrared (FTIR) spectroscopy and fatty acids profile is reported. Also, the relevant parameters of oils are characterized using a combination of standard techniques such as the Principal Component Analysis, k-Means, and Gaussian Mixture Model (GMM) fitting parameters. Two different approaches to perform unsupervised clustering using GMM were investigated. The first approach relies on the profile of fatty acids, while the second is FT-IR spectroscopy-based. The GMM fitting parameters in both approaches were compared. The results obtained from both approaches are consistent and complementary and provide the tools to address the characterization and clustering issues in grape seed oils.

Published
2021

13. Managing Generation Z : Motivation, Engagement and Loyalty

Author

Agnieszka Niemczynowicz, Radosław Antoni Kycia, Joanna Nieżurawska, Agnieszka Niemczynowicz, Radosław Antoni Kycia, and Joanna Nieżurawska

Subjects
Generation Z--Europe, Personnel management--Europe
Abstract

Generation Z (Gen Z) is the young generation born between the mid-1990s and 2010s. They are now entering the market and starting their first jobs. Therefore, managers must shape the company workplace environment to encourage young employees to work efficiently and connect their future with the company. Only then will both managers and employees share mutual satisfaction from collaboration and aim at the common target, which should be the prosperity of the company. This book presents research results and techniques for analysing the working expectations and needs of Gen Z. The analyses were made in various countries in Europe: The Czech Republic, Latvia, Poland, and Portugal.The book contains chapters that present the analysis results and technical chapters that outline modern methods of analysis of management data, including tutorial chapters on machine learning, which currently makes a strong appearance in research in various disciplines. This volume will be of interest to researchers, academics, practitioners, and students in the fields of management studies, research methods, and human resource management.The Open Access version of this book, available at www.taylorfrancis.com, has been made available under a Creative Commons Attribution-NonCommercial-No Derivatives 4.0 license.

Published
2023

14. Entropy and Ergodicity of Boole-Type Transformations

Author

Alexander Balinsky, Denis Blackmore, Anatolij K. Prykarpatski, and Radoslaw Antoni Kycia

Subjects
Pure mathematics, Dynamical systems theory, Science, QC1-999, General Physics and Astronomy, Astrophysics, Lebesgue integration, Article, Entropy (classical thermodynamics), symbols.namesake, Bernoulli type transformations, Ergodic theory, Invariant (mathematics), Mathematics, fibered multidimensional mappings, induced transformations, invariant measure, Physics, Ergodicity, QB460-466, Boole-type transformations, Metric (mathematics), symbols, ergodicity, Invariant measure, entropy, discrete transformations
Abstract

We review some analytic, measure-theoretic and topological techniques for studying ergodicity and entropy of discrete dynamical systems, with a focus on Boole-type transformations and their generalizations. In particular, we present a new proof of the ergodicity of the 1-dimensional Boole map and prove that a certain 2-dimensional generalization is also ergodic. Moreover, we compute and demonstrate the equivalence of metric and topological entropies of the 1-dimensional Boole map employing “compactified”representations and well-known formulas. Several examples are included to illustrate the results. We also introduce new multidimensional Boole-type transformations invariant with respect to higher dimensional Lebesgue measures and investigate their ergodicity and metric and topological entropies.

Published
2021
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15. Lineshape of the Higgs boson in future lepton colliders

Author

Radoslaw Antoni Kycia and S. Jadach

Subjects
Nuclear and High Energy Physics, Particle physics, FOS: Physical sciences, Centre-of-mass energy spread, Electron, 01 natural sciences, Resonance (particle physics), law.invention, Energy scan, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), law, 0103 physical sciences, 010306 general physics, Collider, Physics, Quantum chromodynamics, Muon, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, The Higgs boson cross section, QCD, Initial radiation state, lcsh:QC1-999, High Energy Physics - Phenomenology, Muon collider, Higgs boson, Physics::Accelerator Physics, High Energy Physics::Experiment, lcsh:Physics, Lepton
Abstract

The effect of the photon emission (bremsstrahlung) in the cross section of the process of direct production of the Higgs boson in the future high luminosity electron and muon colliders is calculated. It was found that cross section at the top of the Higgs boson resonance peak is reduced by factor 0.347 for the electron collider and 0.548 for the muon collider. Machine spread of the centre of the mass energy of 4.2MeV (equal to the Higgs width) would reduce peak cross section further, by factor 0.170 and 0.256 (QED and energy spread) for electron and muon beams respectively. Possible uncertainties in the resummed QED calculations are discussed. Numerical results for the lineshape cross section including QED and many values of the machine energy spread are provided., 18 pages, 7 figures; added new references

Published
2016

16. Geometric Aspects of the Isentropic Liquid Dynamics and Vorticity Invariants

Author

Radoslaw Antoni Kycia, Alexander Balinsky, Denis Blackmore, and Anatolij K. Prykarpatski

Subjects
hydrodynamic Euler equations, General Physics and Astronomy, lcsh:Astrophysics, Review, Cotangent space, Space (mathematics), 01 natural sciences, 11.10.Ef, 11.15.-q, 11.10.Wx, 010305 fluids & plasmas, lcsh:QB460-466, 0103 physical sciences, Lie algebra, Lie-Poisson structure, 11.15.Kc, 0101 mathematics, Abelian group, Invariant (mathematics), liquid flow, lcsh:Science, 05.30.-d, Mathematical physics, Physics, applied_mathematics, charged liquid fluid dynamics, lcsh:QC1-999, Invariant theory, 010101 applied mathematics, isentropic hydrodynamic invariants, 11.10.-z, vortex invariants, Phase space, lcsh:Q, Diffeomorphism, diffeomorphism group, symmetry reduction, lcsh:Physics, Symplectic geometry
Abstract

We review a modern differential geometric description of fluid isentropic motion and features of it including diffeomorphism group structure, modelling the related dynamics, as well as its compatibility with the quasi-stationary thermodynamical constraints. We analyze the adiabatic liquid dynamics, within which, following the general approach, the nature of the related Poissonian structure on the fluid motion phase space as a semidirect Banach groups product, and a natural reduction of the canonical symplectic structure on its cotangent space to the classical Lie-Poisson bracket on the adjoint space to the corresponding semidirect Lie algebras product are explained in detail. We also present a modification of the Hamiltonian analysis in case of a flow governed by isothermal liquid dynamics. We study the differential-geometric structure of isentropic magneto-hydrodynamic superfluid phase space and its related motion within the Hamiltonian analysis and related invariant theory. In particular, we construct an infinite hierarchy of different kinds of integral magneto-hydrodynamic invariants, generalizing those previously constructed in the literature, and analyzing their differential-geometric origins. A charged liquid dynamics on the phase space invariant with respect to an abelian gauge group transformation is also investigated, and some generalizations of the canonical Lie-Poisson type bracket is presented.\udKeywords: liquid flow; hydrodynamic Euler equations; diffeomorphism group; Lie-Poisson structure; isentropic hydrodynamic invariants; vortex invariants; charged liquid fluid dynamics; symmetry reduction

Published
2020
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17. Integrability of Geodesics of Totally Geodesic Metrics

Author

Maria Ulan and Radoslaw Antoni Kycia

Subjects
Weyl tensor, Geodesic, Integrable system, 010308 nuclear & particles physics, 010102 general mathematics, Riemannian geometry, Space (mathematics), 01 natural sciences, symbols.namesake, 0103 physical sciences, symbols, 0101 mathematics, Signature (topology), Solving the geodesic equations, Differential (mathematics), Mathematics, Mathematical physics
Abstract

Analysis of the geodesics in the space of the signature (1, 3) that splits in two-dimensional distributions resulting from the Weyl tensor eigenspaces—hyperbolic and elliptic ones—described in [V.V. Lychagin, V. Yumaguzhin, Differential invariants and exact solutions of the Einstein equations, Anal. Math. Phys. 1664-235X 1–9 (2016)] is presented. The cases when geodesic equations are integrable are identified. A similar analysis is performed for the model coupled to electromagnetism described in [V.V. Lychagin, V. Yumaguzhi, Differential invariants and exact solutions of the Einstein–Maxwell equation, Anal. Math. Phys. 1, 19–29, (2017)].

Published
2019
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18. The Poincare lemma, antiexact forms, and fermionic quantum harmonic oscillator

Author

Radoslaw Antoni Kycia

Subjects
Mathematics - Differential Geometry, Pure mathematics, Differential equation, Applied Mathematics, Operator (physics), Homotopy, 010102 general mathematics, FOS: Physical sciences, Derivative, Mathematical Physics (math-ph), 01 natural sciences, Mathematics::Algebraic Topology, 010101 applied mathematics, Closed and exact differential forms, Mathematics (miscellaneous), Differential Geometry (math.DG), Quantum harmonic oscillator, Exterior derivative, FOS: Mathematics, 0101 mathematics, Mathematical Physics, Eigenvalues and eigenvectors, Mathematics, 58A12, 58Z05
Abstract

The paper focuses on various properties and applications of the homotopy operator, which occurs in the Poincar\'{e} lemma. In the first part, an abstract operator calculus is constructed, where the exterior derivative is an abstract derivative and the homotopy operator plays the role of an abstract integral. This operator calculus can be used to formulate abstract differential equations. An example of the eigenvalue problem that resembles the fermionic quantum harmonic oscillator is presented. The second part presents the dual complex to the Dolbeault bicomplex generated by the homotopy operator on complex manifolds., Comment: 14 pages, 4 figures

Published
2019
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19. Erratum: Observation of D0 Meson Nuclear Modifications in Au+Au Collisions at sNN=200 GeV [Phys. Rev. Lett. 113 , 142301 (2014)]

Author

Zebo Tang, Janusz Chwastowski, Leo Clifford Greiner, C. Perkins, F. Ding, P. Djawotho, F. Videbæk, G. Webb, Wenbin Yan, Y. Panebratsev, D. Grosnick, Rihan Haque, Zhigang Xiao, H. Z. Huang, S. Vokal, Sukalyan Chattopadhyay, N. G. Minaev, Z. Z. Xu, Madan M. Aggarwal, Fuqiang Wang, Jaroslav Bielcik, Jie Zhang, A. Vossen, Nikita Smirnov, O. D. Tsai, Y. Zawisza, M. J. Skoby, Frank Jm Geurts, K. Yip, J. S. Wang, N. Xu, P. Filip, H. W. Ke, O. V. Rogachevskiy, H. J. Jang, T. Kollegger, F. Liu, D. D. Koetke, M. C. Cervantes, J. H. Chen, Li-Zhu Chen, W. Q. Shen, Vitaly Okorokov, Bernd Surrow, P. Pile, G. D. Westfall, B. Pawlik, R. R. Debbe, D. A. Morozov, Nasim, S. Das, B. Huang, A. Gupta, D. Solanki, Mariusz Przybycien, L. Kotchenda, W. B. Schmidke, C. A. Gagliardi, M. Pachr, D. Garand, Y. Wang, Y. F. Xu, S. Dhamija, M. Lomnitz, Sevil Salur, Basanta Kumar Nandi, M. Tokarev, D. Tlusty, D. Kalinkin, S. Zhang, S. G. Brovko, R. D. Majka, S. Heppelmann, J. Rusnak, N. K. Pruthi, D. M.M.D. Madagodagettige Don, D. R. Gangadharan, A. F. Kraishan, D. N. Svirida, Niladribihari Sahoo, T. D. S. Stanislaus, L. Ruan, A. M. Poskanzer, Maxence Vandenbroucke, M. K. Mustafa, S. K. Gupta, Giacomo Contin, J. L. Drachenberg, W. Borowski, J. Schambach, Anju Bhasin, Z. H. Khan, Guo-Liang Ma, S. Ramachandran, G. Eppley, Y. Li, H. H. Wieman, Li Yi, A. Chikanian, C. Yang, I. Sakrejda, O. Eyser, J. Pluta, M. Zyzak, Stephen V. Gliske, A. K. Bhati, D. Keane, Y. F. Wu, K. Kang, Aditi Banerjee, R. Stock, W. Li, A. Lebedev, L. G. Efimov, T. J. Humanic, J. Putschke, E. Sangaline, D. Arkhipkin, Xiaofeng Zhu, D. P. Mahapatra, T. K. Nayak, Z. P. Zhang, A. Hamed, A. S. Hirsch, J. Engelage, Rene Bellwied, H. G. Ritter, G. Nigmatkulov, P. Kravtsov, A. M. Schmah, Y. H. Zhu, R. E. Tribble, Dmitry Smirnov, Z. Ye, T. P. Burton, Jize Zhao, Y. Yang, Gerald W Hoffmann, X. Huang, A. Kechechyan, J. M. Landgraf, D. J. Hofman, Xiangyuan Cui, W. Christie, Nilay Shah, Pradip Kumar Sahu, R. Cendejas, A. V. Brandin, A. Ogawa, P. Chaloupka, Andrey Vasiliev, M. Strikhanov, K. Xin, J. Takahashi, S. Trentalange, X.G. Li, H. F. Chen, P. Huck, M. A. C. Lamont, S. B. Nurushev, J. Konzer, P. Sorensen, Janet Elizabeth Seger, D. L. Olvitt, A. Kesich, G. Odyniec, J. Sandweiss, J. Turnau, M. Shao, Y. X. Pan, G. Van Buren, S. Fazio, I. G. Bordyuzhin, S. S. Shi, Mirko Planinic, Jana Bielcikova, Anthony Robert Timmins, Adam Ryszard Kisiel, Prabhat Ranjan Pujahari, J. L. Romero, J. M. Nelson, H. J. Crawford, J. K. Adkins, Y. G. Ma, W. Peryt, E. Finch, C-Q. Li, R. P. Scharenberg, Christina Markert, R. Fatemi, O. Rusnakova, H. S. Matis, W. W. Jacobs, J. Lauret, J. A. Vanfossen, R. Lednicky, Haiyan Wang, J. F. Ross, X. M. Sun, Wei Xie, T. G. Dedovich, M. Cherney, Xiangming Sun, A. Aparin, G. M.S. Vasconcelos, Y. Pandit, K. S. Engle, Lokesh Kumar, Hua Pei, N. Schmitz, E. Shahaliev, Amal Sarkar, I. Koralt, N. Yu, L. V. Nogach, J. H. Thomas, G. S. Averichev, Jian Deng, J. Porter, Ivan Kisel, G. Agakishiev, D. S. Gunarathne, E. P. Sichtermann, A. Roy, Z. Chang, D. Cebra, Rashmi Raniwala, H. M. Spinka, T. Ullrich, Radoslaw Antoni Kycia, C. M. Du, H. S. Xu, L. Eun, I. G. Alekseev, Y. Guo, Jongmin Lee, R. L. Ray, M. A. Lisa, T. Ljubicic, C. D. Anson, R. Witt, H. Caines, Sudhir Raniwala, A. Quintero, S. Mioduszewski, Bedangadas Mohanty, Zhiming Li, H. Bichsel, A. Gibson, Y. Zoulkarneeva, C. Zhong, X. L. Wang, Donald M. McDonald, E. C. Aschenauer, S. Margetis, Prithwish Tribedy, B. K. Srivastava, Alice Elisabeth Ohlson, X. Dong, S. K. Pal, Justin Stevens, J. M. Butterworth, M. Calderon De La Barca Sanchez, M. Wada, J. C. Webb, Robert Vertesi, Olga Evdokimov, Barbara Antonina Trzeciak, H. Masui, L. Didenko, I. K. Yoo, Hao Qiu, P. V. Shanmuganathan, T. Tarnowsky, L. E. Dunkelberger, M. M. Mondal, C. E. Flores, E. G. Judd, Jay Roberts, A. A. Derevschikov, Michal Sumbera, S. Bültmann, S. W. Wissink, Y. Zhang, Nikola Poljak, J. E. Draper, G. Wang, Z. J. Sun, K. Krueger, C. K. Riley, G. J. van Nieuwenhuizen, M. A. Szelezniak, L. C. Bland, J. Alford, W. Guryn, Y. Fisyak, K. Oh, J. Fedorisin, P. Seyboth, J. C. Dunlop, Leszek Adamczyk, R. Derradi de Souza, Q. H. Xu, J. W. Harris, J. Xu, I. Kulakov, M. J. M. Codrington, B. Di Ruzza, Zubayer Ahammed, S. Horvat, R. N. Singaraju, T. Pawlak, W. Zha, M. J. LeVine, D. G. Underwood, J. Cheng, T. J. M. Symons, L. C. De Silva, P. Yepes, R. S. Longacre, A. Davila Leyva, Xuan Zhang, Q. Y. Shou, X. G. Luo, A. H. Tang, G. Igo, J. Novak, B. Sharma, J. Bouchet, K. D. Landry, K. Kauder, I. Bunzarov, Hanna Paulina Zbroszczyk, D. R. Beavis, F. Zhao, W. J. Llope, R. Varma, L-X. Han, S. Y. Noh, J. L. Zhang, B. S. Page, D. P. Kikola, B. Stringfellow, J. G. Cramer, M. R. Girard, E. W. Oldag, T. S. McShane, P. Bhattarai, Y. J. Sun, C. Dilks, S. Kabana, Y. P. Viyogi, and B. Haag

Subjects
Physics, Particle physics, Meson, 010308 nuclear & particles physics, 0103 physical sciences, General Physics and Astronomy, Heavy ion, Charm (quantum number), 010306 general physics, 01 natural sciences
Published
2018
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20. A Framework for Assumption-Free Assessment of Imperfect Geometry of a Linac C-Arms

Author

Radoslaw Antoni Kycia, D. Kabat, Zbigniew Latała, Monika Tulik, A. Woszczyna, and Zbisław Tabor

Subjects
Laboratory frame of reference, Angular displacement, Applied Mathematics, FOS: Physical sciences, Geometry, Radiation, Physics - Medical Physics, Linear particle accelerator, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, Geometric algebra, 0302 clinical medicine, 030220 oncology & carcinogenesis, Calibration, Medical Physics (physics.med-ph), Imperfect, Mathematics
Abstract

In the present paper a general setup for determination of imperfect geometry of radiotherapeutic devices has been proposed that base on geometric algebra framework. To account for this imperfect geometry, two methods of a calibration were presented, consisting of determining for each angular position of a gantry a correction shift which must be applied to the origin of a laboratory frame of reference to place it along a radiation axis for this angular position. Closed form solutions for these corrections are provided., 17 pages, 6 figures

Published
2018
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21. Relativistic Voigt profile for unstable particles in high energy physics

Author

Radoslaw Antoni Kycia and S. Jadach

Subjects
Voigt profile, High Energy Physics - Theory, Particle physics, 010308 nuclear & particles physics, Applied Mathematics, Nuclear Theory, FOS: Physical sciences, Function (mathematics), Mathematical Physics (math-ph), 01 natural sciences, Resonance (particle physics), 33E20, Distribution (mathematics), High Energy Physics - Theory (hep-th), Mathematics - Classical Analysis and ODEs, 0103 physical sciences, Classical Analysis and ODEs (math.CA), FOS: Mathematics, Relativistic Breit–Wigner distribution, Spectroscopy, 010303 astronomy & astrophysics, Analysis, Mathematical Physics, Mathematics
Abstract

The Voigt profile is one of the most used special function in optical spectroscopy. In particle physics a version of this profile which originates from relativistic Breit-Wigner resonance distribution often appears, however, in the literature there is no strict derivation of its properties. The purpose of this paper is to define properly relativistic Voigt profile and describe it along the same way as their standard nonrelativistic counterparts., 14 pages, 7 figures

Published
2017

22. A framework for alignment of on-board imagers of medical linear accelerators

Author

Monika Tulik, A. Woszczyna, Radoslaw Antoni Kycia, D. Kabat, Zbigniew Latała, and Zbisław Tabor

Subjects
Diagnostic Imaging, Computer science, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Biophysics, General Physics and Astronomy, Imaging phantom, Linear particle accelerator, 030218 nuclear medicine & medical imaging, law.invention, 03 medical and health sciences, 0302 clinical medicine, law, Medical imaging, Image Processing, Computer-Assisted, Radiology, Nuclear Medicine and imaging, Computer vision, Projection (set theory), Image-guided radiation therapy, business.industry, Collimator, General Medicine, 030220 oncology & carcinogenesis, Calibration, Artificial intelligence, Radiotherapy, Intensity-Modulated, Particle Accelerators, Fiducial marker, business, Algorithms, Reference frame
Abstract

Purpose To develop an assumption-free methodology for aligning the geometry of on-board imagers with the geometry of medical linear accelerators applied in image-guided radiotherapy (IGRT). Material Alignment of the on-board imaging (OBI) system with respect to the accelerator system is achieved using a multi-modular phantom described elsewhere (Tabor et al., 2017), enabling the geometry of the linear accelerator to be specified without any pre-assumptions. Methods The placement of two isocentres (of the on-board imager and of the therapeutic system) and of three frames of reference (those of the on-board imager, of the therapeutic system, and of the treatment table) is formulated as an optimization problem. It is solved by analysing the images of fiducial points positioned in 3D space in phantom modules attached to the treatment table and to the collimator of the accelerator. Fiducials are projected onto an imaging plane of unknown characteristics from a virtual source of unknown coordinates. Conclusions An analytical framework exploiting projection images of the proposed multi-modular phantom has been developed, enabling precise alignment of the reference frame related to the on-board imager with the reference frame related to the therapeutic system. Within the proposed framework, the necessary corrections of treatment table positioning prior to patient irradiation, are delivered in the treatment table coordinates.

Published
2017

23. Triple Regge exchange mechanisms of four-pion continuum production in the pp→ppπ+π−π+π− reaction

Author

Piotr Lebiedowicz, J. Turnau, Radoslaw Antoni Kycia, and Antoni Szczurek

Subjects
Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Sigma, 01 natural sciences, Formalism (philosophy of mathematics), Pion, Amplitude, Monte carlo code, Quantum mechanics, Phase space, 0103 physical sciences, Rapidity, Nuclear Experiment, 010306 general physics
Abstract

We consider exclusive multiperipheral production of four charged pions in proton-proton collisions at high energies with simultaneous exchange of three Pomerons/Reggeons. The amplitude(s) for the genuine $2\ensuremath{\rightarrow}6$ process are written in the Regge approach. The calculation is performed with the help of the GenEx Monte Carlo code. Some corrections at low invariant masses in the two-body subsystems are necessary for application of the Regge formalism. We estimate the corresponding cross section and present differential distributions in rapidity, transverse momenta and two- and four-pion invariant masses. The cross section and the distributions depend on the value of the cutoff parameter of a form factor correcting amplitudes for off-shellness of $t$-channel pions. A rather large cross section is found for the whole phase space ($\ensuremath{\sigma}\ensuremath{\sim}1--5\text{ }\text{ }\ensuremath{\mu}\mathrm{b}$, including absorption corrections). Relatively large four-pion invariant masses are populated in the considered diffractive mechanism compared to other mechanisms discussed so far in the context of four-pion production. We investigate whether the triple Regge exchange processes could be identified with the existing LHC detectors. We consider the case of ATLAS and ALICE cuts. The ATLAS (or CMS) has a better chance to identify the process in the region of large invariant masses ${M}_{4\ensuremath{\pi}}g10\text{ }\text{ }\mathrm{GeV}$. In the case of the ALICE experiment the considered mechanism competes with other mechanisms (production of $\ensuremath{\sigma}\ensuremath{\sigma}$, $\ensuremath{\rho}\ensuremath{\rho}$ pairs or single resonances) and cannot be unambiguously identified.

Published
2017
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24. Use of statistical approaches to improve the quality control of the dose delivery in radiotherapy

Author

Monika Tulik, Radoslaw Antoni Kycia, D. Kabat, Zbisław Tabor, and Mateusz Baran

Subjects
Quality Control, Computer science, medicine.medical_treatment, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Neoplasms, medicine, Humans, Radiology, Nuclear Medicine and imaging, Radiometry, Dose delivery, Models, Statistical, Radiological and Ultrasound Technology, Phantoms, Imaging, business.industry, Radiotherapy Planning, Computer-Assisted, Detector, Radiotherapy Dosage, Radiation therapy, Homogeneous, 030220 oncology & carcinogenesis, Calibration, Radiotherapy, Intensity-Modulated, business, Quality assurance, Algorithm
Abstract

The gamma index is a measure used routinely for the quality control of dose delivery in radiotherapy, implemented in commercial systems for the verification of treatment plans. It involves comparison of the difference between planned and delivered doses to a single reference. The same reference value is selected for all points in the plan that can potentially hide dose delivery errors, especially in medium and low dose areas. In this study, a receiver operating characteristic analysis is used to demonstrate the limits of the performance of the global gamma index as a method for detecting dose delivery errors. The performance of a global gamma index is compared with two approaches based on statistical tests for outlier detection. Two statistical approaches are considered: according to the first, the distribution of the delivered doses is estimated based on an appropriate calibration procedure. According to the second, the distribution of the delivered doses is estimated based on the detection of relatively homogeneous regions of a plan and analyzing the distributions of planned doses within these regions. The performance of the three approaches is compared based on analytical considerations and in simulations in which errors are intentionally introduced to the plan delivery and noise related to dose delivery is modeled. We have shown that a statistics-based approach to gamma analysis generally leads to better detection of true delivery errors. The results of analytical consideration coincide with the simulations. In simulations, we observe that both statistical approaches are better detectors of true delivery errors than the global method for the gamma-index passing rate in the range from 0.9-1.0. It is shown that the global gamma index is a weak detector of dose delivery errors, which in some circumstances behaves only slightly better than a purely random classifier.

Published
2019
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25. A framework for on-line calibration of LINAC devices

Author

Zbisław Tabor, A. Woszczyna, Zbigniew Latała, Monika Tulik, D. Kabat, and Radoslaw Antoni Kycia

Subjects
Calibration (statistics), Applied Mathematics, Physics::Medical Physics, FOS: Physical sciences, Image guided radiotherapy, Physics - Medical Physics, Linear particle accelerator, Projection (linear algebra), 030218 nuclear medicine & medical imaging, 03 medical and health sciences, Geometric algebra, 0302 clinical medicine, Position (vector), 030220 oncology & carcinogenesis, Line (geometry), Medical Physics (physics.med-ph), Algorithm, Image-guided radiation therapy, Mathematics
Abstract

General description of an on-line procedure of calibration for IGRT (Image Guided Radiotherapy) is given. The algorithm allows to improve targeting cancer by estimating its position in space and suggests appropriate correction of the position of the patient. The description is given in the Geometric Algebra language which significantly simplifies calculations and clarifies presentation., Comment: 13 pages, 7 figures

Published
2017
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26. Elastic Hadron Scattering in Various Pomeron Models

Author

P. Erland, Rafal Staszewski, Radoslaw Antoni Kycia, and Maciej Trzebinski

Subjects
010302 applied physics, Physics, Elastic scattering, Proton, Scattering, Hadron, Monte Carlo method, High Energy Physics::Phenomenology, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, 01 natural sciences, Nuclear physics, Scattering amplitude, High Energy Physics - Phenomenology, Pomeron, Cross section (physics), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, 010306 general physics, Nuclear Experiment
Abstract

In this work the process of elastic hadron scattering is discussed. In particular, scattering amplitudes for the various Pomeron models are compared. In addition, differential elastic cross section as a function of the scattered proton transverse momentum for unpolarised and polarised protons is presented. Finally, an implementation of the elastic scattering amplitudes into the GenEx Monte Carlo generator is discussed., Comment: Presented by P. Erland at XXIII Cracow Epiphany Conference

Published
2017
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27. The adaptive Monte Carlo toolbox for phase space integration and generation

Author

Janusz Chwastowski, Maciej Trzebinski, J. Turnau, Radoslaw Antoni Kycia, and Rafal Staszewski

Subjects
Adaptive sampling, Generator (computer programming), Modular structure, Physics and Astronomy (miscellaneous), Computer science, Monte Carlo method, Process (computing), FOS: Physical sciences, 01 natural sciences, Toolbox, Computational science, 010101 applied mathematics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Integrator, Phase space, 0101 mathematics
Abstract

An implementation of the Monte Carlo (MC) phase space generators coupled with adaptive MC integration/simulation program FOAM is presented. The first program is a modification of the classic phase space generator GENBOD interfaced with the adaptive sampling integrator/generator FOAM. On top of this tool the algorithm suitable for generation of the phase space for an reaction with two leading particles is presented (double-peripheral process with central production of particles). At the same time it serves as an instructive example of construction of a self-adaptive phase space generator/integrator with a modular structure for specialized particle physics calculations., Comment: 18 pages, 4 figures, 5 tables

Published
2017
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28. A generic multimodule phantom for testing geometry of a linac c-arm as a part of quality control in radiotherapy

Author

D. Kabat, Monika Tulik, Zbisław Tabor, Zbigniew Latała, and Radoslaw Antoni Kycia

Subjects
Quality Control, Optimization problem, Rotation, Phantoms, Imaging, Isocenter, Geometry, Collimator, General Medicine, Imaging phantom, Radiotherapy, Computer-Assisted, 030218 nuclear medicine & medical imaging, law.invention, 03 medical and health sciences, 0302 clinical medicine, Position (vector), law, 030220 oncology & carcinogenesis, Particle Accelerators, Projection (set theory), Fiducial marker, Rotation (mathematics), Mathematics
Abstract

Purpose To develop an assumption-free methodology for testing geometry of linacs. Methods The problem of projecting a fiducial positioned in a predefined point in a 3D space and attached rigidly to a treatment table of a radiotherapeutic device onto an imaging plane with unknown characteristics from a source with unknown coordinates is formulated. The problem of determining these unknowns is formulated as an optimization problem. The problem of determining the gantry/the collimator rotation axis and angle from projection of additional fiducials is also formulated and solved. Analytical methodology is developed for determining isocenter position and an error of estimating isocenter position. The developed methodology is tested in simulations. Results Very good agreement between preset and calculated values of quantities of interest was found in the simulations. In all cases the proposed schemes enabled determination of the geometric characteristics of a radiotherapeutic device with accuracy better than one hundredth of a millimeter and one hundredth of a degree. Conclusions A concept of a multi-module multi-fiducial phantom has been introduced. Analytical framework has been developed to extract geometric characteristics of radiotherapy devices from projection images of a phantom. The phantom design and the methodology developed have been tested in simulations. This article is protected by copyright. All rights reserved.

Published
2016

29. Feasibility studies of the diffractive bremsstrahlung measurement at the LHC

Author

J. Turnau, Rafal Staszewski, Janusz Chwastowski, Sabina Czekierda, Maciej Trzebinski, and Radoslaw Antoni Kycia

Subjects
Physics, Photon, Large Hadron Collider, Luminosity (scattering theory), Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Scattering, Nuclear Theory, Bremsstrahlung, Physics::Optics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Proton energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Physics::Accelerator Physics, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Energy (signal processing)
Abstract

Feasibility studies of an observation of the exclusive diffractive bremsstrahlung in proton-proton scattering at the LHC are reported. A simplified approach to the photon and the scattered proton energy reconstruction is used. The background influence is discussed., Comment: 15 pages, 6 figures

Published
2016

31. Centrality and Transverse Momentum Dependence of Elliptic Flow of Multistrange Hadrons andϕMeson inAu+AuCollisions atsNN=200 GeV

Author

Zongye Zhang, J. K. Adkins, Jorn Henning Putschke, I. G. Bordyuzhin, Mirko Planinic, R. Fatemi, L. He, K. Krueger, Xuan Zhang, D. G. Underwood, H. Qiu, M. Tokarev, Yang Yang, A. V. Brandin, K. Xin, Q. Yang, Zhiming Li, H. Z. Huang, S. Vokal, I. Kisel, R. S. Longacre, Xiangming Sun, Hanna Paulina Zbroszczyk, C-Q. Li, Vipul Bairathi, R. P. Scharenberg, Christina Markert, D. Smirnov, O. Rusnakova, Jaroslav Bielcik, H. S. Matis, L. K. Kosarzewski, J. Cheng, Xiaofeng Zhu, W. W. Jacobs, Xiaofeng Luo, A. Ogawa, J. Lauret, Radoslaw Antoni Kycia, T. D. S. Stanislaus, Y. Fisyak, R. Lednicky, L. Kochenda, T. Tarnowsky, L. C. De Silva, I. K. Yoo, M. Cherney, Lin Ma, Lokesh Kumar, Hua Pei, R. Witt, J. C. Webb, H. H. Wieman, K. Oh, E. C. Aschenauer, I. G. Alekseev, M. A. Lisa, Shangfeng Yang, J. H. Chen, Guo-Liang Ma, S. K. Tripathy, O. V. Rogachevskiy, H. J. Jang, R. Haque, S. Mioduszewski, Z. Chang, S. Margetis, G. Igo, J. Novak, J. W. Harris, X. Dong, D. A. Morozov, I. Sakrejda, Mukesh Sharma, K. Poniatowska, M. Zyzak, Donald M. McDonald, B. Sharma, J. Bouchet, Zebo Tang, G. Wang, W. Guryn, C. E. Flores, E. G. Judd, N. Yu, K. D. Landry, S. K. Gupta, Giacomo Contin, Kejun Kang, L. V. Nogach, Prithwish Tribedy, B. K. Srivastava, A. S. Hirsch, J. Engelage, J. Butterworth, Leo Clifford Greiner, A. M. Poskanzer, Z. Ye, G. Nigmatkulov, J. Fedorisin, Y. Guo, D. Kalinkin, Robert Vertesi, Anju Bhasin, M. Posik, B. J. Summa, Jongmin Lee, R. L. Ray, G. Eppley, Madan M. Aggarwal, Nihar Sahoo, X. C. Chen, Fuqiang Wang, P. Huck, M. R. Girard, M. A.C. Lamont, Z. J. Sun, P. Sorensen, Sumit R. Das, G. Van Nieuwenhuizen, X. Huang, A. Kechechyan, H. M. Spinka, R. Ma, P. Kravtsov, A. M. Schmah, J. M. Landgraf, Roli Esha, D. K. Mishra, X. Li, Jie Zhao, S. Horvat, T. Ljubicic, Anthony Robert Timmins, Adam Ryszard Kisiel, P. Yepes, J. Pluta, S. Y. Noh, J. C. Dunlop, L. Wen, Nilay Shah, A. H. Tang, Pradip Kumar Sahu, S. Fazio, A. Banerjee, J. Porter, M. Strikhanov, C. Perkins, A. Lebedev, A. Manion, H. Caines, Sudhir Raniwala, J. B. Zhang, D. D. Koetke, J. E. Draper, G. Agakishiev, D. S. Gunarathne, Michal Sumbera, S. Ramachandran, O. Eyser, A. Quintero, W. Li, H. J. Crawford, L. Didenko, I. Chakaberia, S. Heppelmann, Zubayer Ahammed, P. Seyboth, P. Bhattarai, Isaac Upsal, Sergey Voloshin, K. Yip, M. K. Mustafa, J. S. Wang, J. Sandweiss, A. Vossen, W. Zha, Nasim, M. M. Mondal, D. Cebra, Q. H. Xu, I. Bunzarov, Rene Bellwied, R. R. Debbe, Zhigang Xiao, Leszek Adamczyk, K. Jiang, Q. Y. Shou, M. Vandenbroucke, S. W. Wissink, R. Stock, Y. Li, S. Singha, Anik Gupta, E. P. Sichtermann, Y. Zhang, Yanjun Wu, D. Tlusty, R. E. Tribble, F. Videbæk, P. V. Shanmuganathan, M. A. Szelezniak, M. Calderon De La Barca Sanchez, Gerald W Hoffmann, A. I. Hamad, N. G. Minaev, G. Webb, A. Sarkar, Nikola Poljak, R. Pak, J. L. Drachenberg, S. Kabana, Sukalyan Chattopadhyay, P. Federic, Vitaly Okorokov, Frank Jm Geurts, G. Odyniec, Rashmi Raniwala, Y. Zoulkarneeva, C. Zhong, Bernd Surrow, W. J. Llope, L. E. Dunkelberger, Olga Evdokimov, Barbara Antonina Trzeciak, A. Roy, J. H. Thomas, N. Magdy, T. Ullrich, A. Peterson, Z. H. Khan, Haiyan Wang, Junjie Zhang, Y. J. Sun, C. Dilks, Bedangadas Mohanty, A. A. Derevschikov, J. Rusnak, Jay Roberts, L. P. Zhou, W. Christie, A. F. Kraishan, C. M. Du, K. Meehan, W. B. Schmidke, H. S. Xu, C. A. Gagliardi, B. Huang, L. Ruan, J. M. Campbell, Z. Feng, M. Lomnitz, Y. P. Viyogi, H. W. Ke, D. L. Olvitt, T. J. Humanic, T. G. Dedovich, B. Di Ruzza, Andrey Vasiliev, M. Stepanov, G. S. Averichev, N. Xu, P. Filip, Abdel Nasser Tawfik, M. Shao, Y. X. Pan, G. Van Buren, P. Pile, G. D. Westfall, K. Kauder, Jun Deng, R. Varma, S. S. Shi, B. S. Page, D. P. Kikola, B. Stringfellow, Y. G. Ma, Janet Elizabeth Seger, C. Yang, David Jonathan Hofman, H. Masui, T. Kollegger, S. B. Nurushev, F. Liu, Miroslav Simko, R. D. Majka, J. Schambach, Wei Xie, A. Aparin, Y. Pandit, N. Schmitz, D. Arkhipkin, A. Hamed, E. Shahaliev, Jana Bielcikova, J. L. Romero, B. Pawlik, A. Gibson, Y. F. Wu, Basanta Kumar Nandi, S. Zhang, P. Chaloupka, Z. J. Xu, S. Trentalange, O. D. Tsai, M. C. Cervantes, L. Yi, L. Song, W. Q. Shen, Xiang Sun, N. Svirida, I. Kulakov, D. Garand, H. G. Ritter, Rafal Sikora, Sevil Salur, Y. Wang, L. C. Bland, Y. F. Xu, A. K. Bhati, D. Keane, Nikolai Smirnov, L. G. Efimov, T. K. Nayak, Y. Panebratsev, M. J. Skoby, D. Grosnick, and L. Fulek

Subjects
Physics, Quark, Strange quark, Particle physics, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Nuclear Theory, Elliptic flow, General Physics and Astronomy, Constituent quark, 01 natural sciences, Nuclear physics, Strange matter, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, Vector meson, Nuclear Experiment, 010306 general physics
Abstract

We present high precision measurements of elliptic flow near midrapidity (|y

Published
2016
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32. Centrality dependence of identified particle elliptic flow in relativistic heavy ion collisions atsNN=7.7–62.4GeV

Author

A. Manion, A. Vossen, Bernd Surrow, W. B. Schmidke, C. A. Gagliardi, Jaroslav Bielcik, O. V. Rogachevskiy, H. J. Jang, R. S. Longacre, Junjie Zhang, Bedangadas Mohanty, Zebo Tang, Leo Clifford Greiner, P. V. Shanmuganathan, J. Novak, B. Sharma, J. Bouchet, J. Engelage, C. Perkins, G. Nigmatkulov, J. Butterworth, Sergey Voloshin, Mukesh Sharma, I. K. Yoo, J. M. Landgraf, A. A. Derevschikov, Zhiqing Zhang, Anik Gupta, R. Haque, M. Strikhanov, Zhiming Li, K. Jiang, Q. H. Xu, A. M. Poskanzer, Maksym Zyzak, Yanjun Wu, Z. J. Sun, Frank Jm Geurts, E. G. Judd, Z. Ye, N. Yu, Kejun Kang, L. V. Nogach, E. P. Sichtermann, P. Chaloupka, J. C. Webb, G. Igo, J. Sandweiss, Nasim, K. Poniatowska, X. Huang, A. Kechechyan, Z. J. Xu, Sumit R. Das, S. K. Gupta, P. Seyboth, Giacomo Contin, Michal Sumbera, A. Peterson, Pradip Kumar Sahu, G. Van Nieuwenhuizen, Leszek Adamczyk, Rashmi Raniwala, Nihar Sahoo, D. Tlusty, I. G. Bordyuzhin, Mirko Planinic, X. C. Chen, P. Federic, D. Brandenburg, O. Chisman, P. Huck, B. Pawlik, I. Kulakov, B. Huang, X. Li, Z. H. Khan, S. W. Wissink, Y. Zhang, A. Gibson, N. Xu, Jana Bielcikova, H. Qiu, T. Ullrich, R. Esha, P. Filip, M. K. Mustafa, Xiaofeng Luo, Anthony Robert Timmins, M. Tokarev, Adam Ryszard Kisiel, Robert Vertesi, Anju Bhasin, Basanta Kumar Nandi, J. C. Dunlop, Nikola Poljak, C-Q. Li, R. P. Scharenberg, Christina Markert, P. Pile, D. Smirnov, O. Rusnakova, G. D. Westfall, S. Zhang, P. Sorensen, C. M. Du, Y. Li, S. Singha, Guo-Liang Ma, H. J. Crawford, J. K. Adkins, T. Niida, H. S. Xu, H. S. Matis, J. E. Draper, L. K. Kosarzewski, Y. X. Pan, W. W. Jacobs, K. D. Landry, A. Lebedev, V. A. Okorokov, R. Fatemi, L. He, Zubayer Ahammed, Y. Fisyak, Y. Guo, J. M. Campbell, K. Krueger, T. D. S. Stanislaus, J. Lauret, Jongmin Lee, R. L. Ray, R. Ma, L. Didenko, I. Chakaberia, Lin Ma, K. Oh, H. H. Wieman, R. Lednicky, L. Kochenda, T. Tarnowsky, A. S. Hirsch, S. Trentalange, D. Arkhipkin, T. Ljubicic, T. G. Dedovich, A. Hamed, P. Kravtsov, A. M. Schmah, F. Liu, A. Roy, Niseem Magdy, H. Caines, Sudhir Raniwala, H. Z. Huang, M. Cherney, A. Quintero, J. Rusnak, Lokesh Kumar, A. F. Kraishan, Xiaofeng Zhu, G. Odyniec, R. D. Majka, Hua Pei, S. K. Tripathy, Y. Zoulkarneeva, C. Zhong, A. Ogawa, J. Schambach, F. Videbæk, A. I. Hamad, W. Christie, L. Ruan, G. Wang, G. Webb, Q. Y. Shou, Sukalyan Chattopadhyay, E. C. Aschenauer, Andrey Vasiliev, S. Margetis, K. Yip, J. S. Wang, X. Dong, M. A.C. Lamont, Z. Feng, M. Lomnitz, Janet Elizabeth Seger, R. R. Debbe, M. Vandenbroucke, S. Y. Noh, L. C. Bland, Jian Deng, D. L. Olvitt, G. Agakishiev, D. S. Gunarathne, R. Pak, Y. F. Xu, S. Kabana, Radoslaw Antoni Kycia, Xiangming Sun, J. W. Harris, S. Heppelmann, I. G. Alekseev, J. L. Drachenberg, M. A. Lisa, Olga Evdokimov, Barbara Antonina Trzeciak, A. K. Bhati, D. Keane, Zhigang Xiao, Nikolai Smirnov, R. Stock, X. Bai, K. Meehan, Jorn Henning Putschke, L. E. Dunkelberger, L. G. Efimov, P. Yepes, N. G. Minaev, A. V. Brandin, K. Xin, A. H. Tang, Z. Chang, N. K. Pruthi, Yu-Gang Ma, T. K. Nayak, G. Eppley, Vipul Bairathi, I. Bunzarov, J. Pluta, Xuan Zhang, W. Li, M. J. Skoby, Rene Bellwied, Jay Roberts, M. Posik, Y. Panebratsev, D. Grosnick, R. E. Tribble, L. Fulek, Gerald W Hoffmann, K. Kauder, H. M. Spinka, L. Yi, Hanna Paulina Zbroszczyk, N. Svirida, A. Banerjee, J. Porter, Y. Yang, H. W. Ke, H. G. Ritter, B. Di Ruzza, Ivan Kisel, W. Guryn, Rafal Sikora, Nilay Shah, J. Fedorisin, M. Calderon De La Barca Sanchez, A. Sarkar, Jie Zhao, S. Horvat, J. L. Romero, J. H. Thomas, M. Simko, W. J. Llope, M. C. Cervantes, L. Wen, W. Zha, L. Song, W. Q. Shen, L. P. Zhou, D. Cebra, Xiang Sun, R. Witt, D. G. Underwood, Q. Yang, D. Garand, S. Mioduszewski, M. Stepanov, G. S. Averichev, Sevil Salur, Y. Wang, J. Cheng, L. C. De Silva, Donald M. McDonald, Prithwish Tribedy, B. K. Srivastava, T. J. Humanic, Abdel Nasser Tawfik, R. Varma, B. S. Page, D. P. Kikola, B. Stringfellow, M. R. Girard, C. E. Flores, P. Bhattarai, Isaac Upsal, M. A. Szelezniak, Y. J. Sun, C. Dilks, Y. P. Viyogi, Thorsten Sven Kollegger, D. Kalinkin, B. J. Summa, J. B. Zhang, D. D. Koetke, S. Ramachandran, O. Eyser, M. M. Mondal, S. Vokal, Wei Xie, A. Aparin, Shangfeng Yang, J. H. Chen, Y. Pandit, D. A. Morozov, N. Schmitz, E. Shahaliev, Y. F. Wu, O. D. Tsai, S. Fazio, Haiyan Wang, J. Thäder, M. Shao, G. Van Buren, S. S. Shi, C. Yang, David Jonathan Hofman, H. Masui, S. B. Nurushev, Madan M. Aggarwal, Fuqiang Wang, and D. K. Mishra

Subjects
Quark, Physics, Antiparticle, Particle physics, 010308 nuclear & particles physics, Elliptic flow, 01 natural sciences, Nuclear physics, Flow (mathematics), 0103 physical sciences, Physics::Accelerator Physics, Particle, Impact parameter, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Scaling
Abstract

Elliptic flow (v2) values for identified particles at midrapidity in Au + Au collisions measured by the STAR experiment in the Beam Energy Scan at the

Published
2016
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33. Software for calculations of the Higgs boson lineshape in future lepton colliders

Author

Radoslaw Antoni Kycia and S. Jadach

Subjects
Quantum chromodynamics, Physics, Particle physics, business.industry, Monte Carlo method, FOS: Physical sciences, Beam broadening, High Energy Physics - Phenomenology, Software, High Energy Physics - Phenomenology (hep-ph), Integrator, Higgs boson, business, Beam energy, Lepton
Abstract

Simple software for Monte Carlo(MC) calculation of the Higgs boson lineshape and its beam broadening effect by the beam energy dispersion was described. The software bases on FOAM [4] adaptive MC integrator from ROOT library [2]. The software is intended for those who want to reproduce results from paper [3] and experiment with different parameters for the lineshapes and QCD correction factors. Parallel version of the software based on MPI [10] is also described., 11 pages, 4 figures

Published
2016

34. Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs inp↑+pats=200 GeV

Author

Nasim, Mukesh Sharma, G. Wang, Zebo Tang, J. W. Harris, E. P. Sichtermann, Leo Clifford Greiner, Rashmi Raniwala, Z. J. Sun, C. Perkins, G. Eppley, Jaroslav Bielcik, J. Pluta, P. V. Shanmuganathan, W. Li, Z. Chang, T. Ullrich, Rene Bellwied, Thorsten Sven Kollegger, D. Kalinkin, L. E. Dunkelberger, P. Yepes, A. H. Tang, R. E. Tribble, Gerald W Hoffmann, F. Videbæk, C. M. Du, H. S. Xu, Xiaofeng Zhu, W. Christie, Xiangming Sun, N. Magdy, N. K. Pruthi, M. Posik, S. Heppelmann, B. J. Summa, G. Webb, A. A. Derevschikov, O. V. Rogachevskiy, H. J. Jang, I. Bunzarov, Andrey Vasiliev, Z. H. Khan, Junjie Zhang, Bedangadas Mohanty, A. Roy, Sukalyan Chattopadhyay, Y. Wang, Y. Fisyak, Lin Ma, H. M. Spinka, A. Banerjee, Y. Guo, Anik Gupta, M. K. Mustafa, K. Oh, A. Ogawa, J. Rusnak, Jongmin Lee, R. L. Ray, J. B. Zhang, D. D. Koetke, Y. Li, Xuan Zhang, H. Qiu, M. Tokarev, Zhiming Li, Frank Jm Geurts, J. E. Draper, S. Ramachandran, Janet Elizabeth Seger, A. F. Kraishan, L. Ruan, Radoslaw Antoni Kycia, J. H. Thomas, T. Ljubicic, Z. Feng, M. Lomnitz, Anju Bhasin, Maksym Zyzak, H. Caines, Sudhir Raniwala, O. Eyser, M. M. Mondal, P. Seyboth, L. P. Zhou, I. G. Alekseev, Madan M. Aggarwal, Fuqiang Wang, Hanna Paulina Zbroszczyk, Zongye Zhang, A. Lebedev, D. Tlusty, I. G. Bordyuzhin, Mirko Planinic, K. Poniatowska, M. A. Lisa, K. Meehan, Jorn Henning Putschke, J. C. Webb, A. V. Brandin, J. Engelage, A. Quintero, J. Alford, Leszek Adamczyk, G. Nigmatkulov, Xiaofeng Luo, Guo-Liang Ma, X. Li, T. D. S. Stanislaus, A. Manion, P. Federic, S. K. Gupta, M. Stepanov, G. S. Averichev, Giacomo Contin, R. Witt, K. Kauder, H. Z. Huang, Michal Sumbera, W. Guryn, S. Vokal, I. Kulakov, J. Porter, K. Xin, A. Vossen, H. H. Wieman, J. M. Landgraf, Ivan Kisel, R. Vertesi, A. S. Hirsch, P. Kravtsov, A. M. Schmah, Nihar Sahoo, E. C. Aschenauer, S. Mioduszewski, M. Strikhanov, F. Liu, C-Q. Li, X. C. Chen, J. M. Campbell, J. L. Romero, Jian Deng, P. Huck, Shangfeng Yang, J. H. Chen, G. Agakishiev, D. S. Gunarathne, R. P. Scharenberg, Christina Markert, R. Ma, Vitaly Okorokov, S. W. Wissink, S. Margetis, Y. Zhang, D. Smirnov, O. Rusnakova, H. S. Matis, X. Dong, D. L. Olvitt, Bernd Surrow, J. Sandweiss, W. J. Llope, Donald M. McDonald, D. Cebra, L. K. Kosarzewski, J. Fedorisin, Prithwish Tribedy, B. K. Srivastava, Nikola Poljak, B. Pawlik, A. M. Poskanzer, Z. Ye, W. W. Jacobs, M. Shao, Y. X. Pan, G. Van Buren, Anthony Robert Timmins, Adam Ryszard Kisiel, K. Yip, J. S. Wang, R. D. Majka, J. Schambach, R. R. Debbe, M. Calderon De La Barca Sanchez, A. I. Hamad, T. G. Dedovich, D. A. Morozov, S. Kabana, J. Lauret, W. B. Schmidke, X. Huang, H. J. Crawford, M. Vandenbroucke, C. A. Gagliardi, J. K. Adkins, Roli Esha, R. Lednicky, L. Kochenda, T. Tarnowsky, Jana Bielcikova, Zhigang Xiao, P. Sorensen, A. Kechechyan, D. Arkhipkin, A. Hamed, R. Fatemi, Pradip Kumar Sahu, L. He, S. S. Shi, Jie Zhao, S. Horvat, K. Krueger, N. G. Minaev, J. L. Drachenberg, Olga Evdokimov, Barbara Antonina Trzeciak, I. Sakrejda, M. A.C. Lamont, S. Y. Noh, M. Simko, N. Yu, Kejun Kang, L. V. Nogach, I. K. Yoo, L. Yi, W. Zha, Sumit R. Das, G. Van Nieuwenhuizen, Kun Jiang, Jay Roberts, M. Cherney, Nilay Shah, A. Sarkar, Lokesh Kumar, L. Didenko, I. Chakaberia, Hua Pei, S. K. Tripathy, D. G. Underwood, R. Haque, Q. Yang, H. W. Ke, J. Cheng, N. Xu, B. Di Ruzza, Yang Yang, L. C. De Silva, J. C. Dunlop, L. Wen, Zubayer Ahammed, C. E. Flores, E. G. Judd, Q. Y. Shou, R. Pak, M. R. Girard, P. Filip, Sergey Voloshin, P. Pile, G. D. Westfall, Wei Xie, A. Aparin, Y. G. Ma, Y. Pandit, N. Schmitz, E. Shahaliev, C. Yang, David Jonathan Hofman, Y. F. Wu, H. Masui, T. J. Humanic, A. Gibson, S. B. Nurushev, S. Fazio, Basanta Kumar Nandi, Abdel Nasser Tawfik, S. Zhang, Haiyan Wang, R. Varma, B. S. Page, D. P. Kikola, T. P. Burton, B. Stringfellow, P. Bhattarai, Isaac Upsal, P. Chaloupka, M. A. Szelezniak, Z. J. Xu, S. Trentalange, N. Svirida, H. G. Ritter, Rafal Sikora, Y. J. Sun, C. Dilks, L. C. Bland, Y. F. Xu, Y. P. Viyogi, M. J. Skoby, Y. Panebratsev, D. Grosnick, L. Fulek, A. K. Bhati, D. Keane, Nikolai Smirnov, R. Stock, L. G. Efimov, T. K. Nayak, O. D. Tsai, M. C. Cervantes, L. Song, W. Q. Shen, Xiang Sun, D. Garand, Sevil Salur, Q. H. Xu, A. Peterson, B. Huang, R. S. Longacre, G. Igo, J. Novak, B. Sharma, J. Bouchet, K. D. Landry, J. Butterworth, G. Odyniec, Y. Zoulkarneeva, and C. Zhong

Subjects
Physics, Quark, Quantum chromodynamics, Particle physics, Meson, Nuclear Theory, Hadron, General Physics and Astronomy, Nuclear physics, Pion, Pair production, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, Nucleon
Abstract

We report the observation of transverse polarization-dependent azimuthal correlations in charged pion pair production with the STAR experiment in p↑+p collisions at RHIC. These correlations directly probe quark transversity distributions. We measure signals in excess of 5 standard deviations at high transverse momenta, at high pseudorapidities η>0.5, and for pair masses around the mass of the ρ meson. This is the first direct transversity measurement in p+p collisions.

Published
2015
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35. Azimuthal Anisotropy inU+UandAu+AuCollisions at RHIC

Author

N. Xu, P. Filip, O. D. Tsai, H. Qiu, M. Tokarev, Yang Yang, M. K. Mustafa, M. C. Cervantes, L. Song, P. Pile, G. D. Westfall, K. Poniatowska, D. Kalinkin, Anju Bhasin, Y. Li, Jun Deng, F. Videbæk, W. Q. Shen, Xiang Sun, T. D. S. Stanislaus, S. K. Gupta, Giacomo Contin, A. Roy, J. Rusnak, J. L. Zhang, M. Calderon De La Barca Sanchez, A. I. Hamad, A. F. Kraishan, Wei Xie, B. J. Summa, G. Webb, L. Ruan, J. C. Dunlop, L. Wen, H. H. Wieman, A. Aparin, R. P. Scharenberg, Christina Markert, R. Ma, I. Kulakov, D. Smirnov, O. Rusnakova, H. S. Matis, D. Garand, Xiang Li, A. Lebedev, Nihar Sahoo, G. Eppley, Zhigang Xiao, Zubayer Ahammed, Y. Pandit, X. C. Chen, Zebo Tang, Zhiming Li, Sevil Salur, Y. Wang, P. Huck, N. G. Minaev, J. B. Zhang, D. D. Koetke, J. E. Draper, P. Federic, L. K. Kosarzewski, W. W. Jacobs, Leo Clifford Greiner, Sergey Voloshin, J. Lauret, N. Schmitz, E. Shahaliev, S. Ramachandran, O. Eyser, R. Lednicky, J. Pluta, J. Alford, J. C. Webb, Y. Guo, Z. Feng, A. M. Poskanzer, Z. Ye, T. Tarnowsky, W. Guryn, Jongmin Lee, Q. Y. Shou, T. P. Burton, M. M. Mondal, M. Lomnitz, Anthony Robert Timmins, Adam Ryszard Kisiel, W. Li, Y. F. Wu, R. L. Ray, Thomas Humanic, A. Kechechyan, A. K. Bhati, C. Perkins, Zongye Zhang, Abdel Nasser Tawfik, D. Keane, I. G. Bordyuzhin, Mirko Planinic, W. J. Llope, Xiaofeng Luo, Z. Chang, P. Seyboth, Pradip Kumar Sahu, Nikolai Smirnov, J. Fedorisin, Cheng Li, B. Pawlik, R. Pak, Guo-Liang Ma, K. Yip, J. S. Wang, H. J. Crawford, L. G. Efimov, H. Z. Huang, R. Varma, S. Vokal, T. K. Nayak, J. Engelage, Roli Esha, T. Ljubicic, J. K. Adkins, B. S. Page, Rene Bellwied, Jie Zhao, S. Horvat, R. Witt, T. Kollegger, D. P. Kikola, A. S. Hirsch, Anik Gupta, Robert Vertesi, G. Nigmatkulov, R. Fatemi, Y. Panebratsev, L. He, Niseem Magdy, R. R. Debbe, H. Caines, Sudhir Raniwala, Leszek Adamczyk, B. Stringfellow, P. Sorensen, S. Mioduszewski, Jaroslav Bielcik, P. Kravtsov, A. M. Schmah, Jana Bielcikova, P. Bhattarai, Isaac Upsal, F. Liu, Miroslav Simko, Shangfeng Yang, J. H. Chen, K. Krueger, A. Quintero, J. L. Romero, W. Zha, G. Agakishiev, D. S. Gunarathne, Donald M. McDonald, D. Grosnick, M. Vandenbroucke, M. Posik, R. E. Tribble, Frank Jm Geurts, P. Chaloupka, D. A. Morozov, Prithwish Tribedy, Xiaofeng Zhu, M. A. Szelezniak, L. Didenko, I. Chakaberia, Z. J. Xu, D. Cebra, B. K. Srivastava, D. G. Underwood, I. Kisel, H. M. Spinka, A. Ogawa, Q. Yang, J. Y. Zhang, D. L. Olvitt, S. Trentalange, Gerald W Hoffmann, J. M. Landgraf, P. V. Shanmuganathan, Y. J. Sun, Subhasis Chattopadhyay, K. Meehan, C. Dilks, S. Kabana, K. Kauder, Lokesh Kumar, A. Banerjee, L. E. Dunkelberger, J. Cheng, R. D. Majka, G. Odyniec, M. Cherney, N. Yu, Y. Zoulkarneeva, L. C. De Silva, E. C. Aschenauer, C. Zhong, J. L. Drachenberg, O. V. Rogachevskiy, Olga Evdokimov, Barbara Antonina Trzeciak, Kejun Kang, L. V. Nogach, Y. P. Viyogi, Hua Pei, S. K. Tripathy, J. Porter, A. Gibson, J. Schambach, S. Margetis, H. J. Jang, Xiangming Sun, M. Strikhanov, A. A. Derevschikov, Basanta Kumar Nandi, Y. Fisyak, Sumit R. Das, S. Zhang, X. Dong, Lin Ma, K. Oh, I. Sakrejda, W. Christie, G. Van Nieuwenhuizen, M. Zyzak, V. A. Okorokov, Kun Jiang, J. Sandweiss, M. A.C. Lamont, S. Y. Noh, Nasim, M. R. Girard, Mukesh Sharma, R. Stock, G. Wang, E. P. Sichtermann, Jay Roberts, N. K. Pruthi, D. Tlusty, D. Arkhipkin, A. Hamed, Rashmi Raniwala, Xin-Yuan Huang, Z. J. Sun, L. Yi, A. Sarkar, Andrey Vasiliev, J. M. Campbell, Nilay Shah, H. W. Ke, Jorn Henning Putschke, T. Ullrich, S. Heppelmann, Radoslaw Antoni Kycia, A. V. Brandin, K. Xin, Z. H. Khan, I. G. Alekseev, J. H. Thomas, C. M. Du, B. Di Ruzza, H. S. Xu, M. A. Lisa, Janet Elizabeth Seger, T. G. Dedovich, L. P. Zhou, Yu-Gang Ma, Madan M. Aggarwal, Fuqiang Wang, Xuan Zhang, J. W. Harris, A. Manion, Hanna Paulina Zbroszczyk, A. Vossen, M. Stepanov, G. S. Averichev, F. Zhao, P. Yepes, A. H. Tang, I. Bunzarov, Bernd Surrow, W. B. Schmidke, C. A. Gagliardi, Michal Sumbera, S. W. Wissink, Y. Zhang, Nikola Poljak, Q. H. Xu, Bedangadas Mohanty, A. Peterson, I. K. Yoo, R. Haque, B. Huang, C. E. Flores, E. G. Judd, R. S. Longacre, G. Igo, J. Novak, B. Sharma, J. Bouchet, K. D. Landry, J. Butterworth, H. G. Ritter, Rafal Sikora, L. C. Bland, Y. F. Xu, D. N. Svirida, M. J. Skoby, L. Fulek, C. Yang, David Jonathan Hofman, H. Masui, S. B. Nurushev, S. Fazio, Haiyan Wang, M. Shao, Y. X. Pan, G. Van Buren, S. S. Shi, and L. Kotchenda

Subjects
Quark, Quantum chromodynamics, Physics, Particle physics, Nuclear Theory, Hadron, Elliptic flow, General Physics and Astronomy, Gluon, Nuclear physics, Quark–gluon plasma, Multiplicity (chemistry), Nuclear Experiment, Relativistic Heavy Ion Collider
Abstract

Collisions between prolate uranium nuclei are used to study how particle production and azimuthal anisotropies depend on initial geometry in heavy-ion collisions. We report the two- and four-particle cumulants, v(2){2} and v(2){4}, for charged hadrons from U + U collisions at root s(NN) = 193 GeV and Au + Au collisions at root s(NN) = 200 GeV. Nearly fully overlapping collisions are selected based on the energy deposited by spectators in zero degree calorimeters (ZDCs). Within this sample, the observed dependence of v(2){2} on multiplicity demonstrates that ZDC information combined with multiplicity can preferentially select different overlap configurations in U + U collisions. We also show that v(2) vs multiplicity can be better described by models, such as gluon saturation or quark participant models, that eliminate the dependence of the multiplicity on the number of binary nucleon-nucleon collisions.

Published
2015
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36. Feasibility studies of the exclusive diffractive bremsstrahlung measurement at RHIC energies

Author

J. Turnau, Janusz Chwastowski, B. Pawlik, Radoslaw Antoni Kycia, Rafal Sikora, Łukasz Fulek, and Antoni Cyz

Subjects
Nuclear physics, Physics, Photon, Proton, Bremsstrahlung, Nuclear Experiment
Abstract

In this paper feasibility studies of the exclusive diffractive bremsstrahlung at RHIC energies are presented. The analysis exploits a simplified approach of the radiated photon and the scattered proton measurement. A brief discussion of possible backgrounds is given.

Published
2015
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37. Precision Measurement of the Longitudinal Double-Spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions ats=200 GeV

Author

Z. P. Zhang, A. S. Hirsch, P. Kravtsov, A. M. Schmah, B. Haag, J. L. Drachenberg, Olga Evdokimov, Barbara Antonina Trzeciak, A. Roy, F. Videbæk, G. Webb, Xiangyuan Cui, W. Christie, P. R. Pujahari, Sukalyan Chattopadhyay, I. Sakrejda, J. K. Adkins, E. P. Sichtermann, M. A.C. Lamont, M. Lomnitz, D. L. Olvitt, Zebo Tang, Janusz Chwastowski, X. Li, Andrey Vasiliev, Q. H. Xu, L-X. Han, S. Y. Noh, R. Fatemi, Jay Roberts, J. Rusnak, Rashmi Raniwala, Nasim, J. Xu, Leo Clifford Greiner, K. Krueger, J. A. Vanfossen, T. Ullrich, Janet Elizabeth Seger, J. H. Thomas, S. Dhamija, L. Yi, Nilay Shah, L. Kotchenda, C. Perkins, A. F. Kraishan, L. Ruan, R. Vertesi, A. K. Bhati, D. Keane, Nikolai Smirnov, R. Stock, J. M. Campbell, J. Turnau, Xiaofeng Zhu, L. C. Bland, A. M. Poskanzer, Z. Ye, M. Cherney, L. G. Efimov, C. M. Du, F. Liu, Mariusz Przybycien, K. S. Engle, R. N. Singaraju, X. Huang, C. K. Riley, A. Ogawa, D. G. Underwood, Hua Pei, H. S. Xu, Jian Deng, T. K. Nayak, H. F. Chen, K. Yip, J. S. Wang, B. Pawlik, S. G. Brovko, R. R. Debbe, Y. Guo, T. G. Dedovich, A. Kechechyan, J. Cheng, I. K. Yoo, Pradip Kumar Sahu, Anik Gupta, F. Ding, Jongmin Lee, R. L. Ray, H. W. Ke, B. Di Ruzza, D. M.M.D. Madagodagettige Don, D. R. Gangadharan, K. Poniatowska, R. D. Majka, M. Vandenbroucke, A. Gibson, T. J. M. Symons, Y. Zawisza, Y. Panebratsev, D. N. Svirida, S. K. Gupta, Giacomo Contin, W. Borowski, R. Haque, D. Grosnick, G. Agakishiev, D. S. Gunarathne, J. Schambach, Frank Jm Geurts, C-Q. Li, Yang Yang, L. C. De Silva, Z. H. Khan, Y. Fisyak, Basanta Kumar Nandi, Nihar Sahoo, G. Eppley, Anju Bhasin, T. Ljubicic, H. Qiu, R. P. Scharenberg, Christina Markert, D. Smirnov, M. Tokarev, O. Rusnakova, P. Huck, H. S. Matis, K. Oh, M. K. Mustafa, J. C. Dunlop, S. Zhang, Yu-Gang Ma, D. Cebra, H. Caines, Sudhir Raniwala, Wenbin Yan, Anthony Robert Timmins, Adam Ryszard Kisiel, G. S. Averichev, J. Alford, L. K. Kosarzewski, A. Lebedev, J. Engelage, A. Quintero, Y. Li, H. J. Crawford, C. E. Flores, E. G. Judd, R. S. Longacre, J. Pluta, W. Guryn, G. Nigmatkulov, V. A. Okorokov, Zhigang Xiao, T. D. S. Stanislaus, Zubayer Ahammed, W. W. Jacobs, J. Lauret, T. P. Burton, C. D. Anson, Xuan Zhang, M. J. LeVine, D. P. Mahapatra, H. H. Wieman, W. Li, Madan M. Aggarwal, H. Bichsel, G. Wang, Jorn Henning Putschke, Fuqiang Wang, J. M. Landgraf, G. Odyniec, R. Lednicky, T. Tarnowsky, G. Igo, P. Djawotho, J. Fedorisin, N. G. Minaev, Y. Zoulkarneeva, C. Zhong, Z. Chang, Li-Yi Chen, Bedangadas Mohanty, B. Huang, J. Novak, I. Koralt, A. V. Brandin, B. Sharma, X. L. Wang, E. C. Aschenauer, D. Solanki, M. Strikhanov, N. Xu, P. Filip, Z. J. Sun, Hanna Paulina Zbroszczyk, J. Bouchet, K. D. Landry, K. Kauder, A. Vossen, J. F. Ross, S. Margetis, Q. Y. Shou, J. Butterworth, Rene Bellwied, K. Xin, N. Yu, Kejun Kang, L. V. Nogach, X. Dong, Y. H. Zhu, Jie Zhao, O. D. Tsai, J. Konzer, P. Pile, D. R. Beavis, G. D. Westfall, P. Seyboth, S. Horvat, D. Tlusty, I. G. Bordyuzhin, Mirko Planinic, S. K. Pal, Justin Stevens, R. E. Tribble, Sumit R. Das, Y. Xu, M. C. Cervantes, P. Chaloupka, Leszek Adamczyk, G. Van Nieuwenhuizen, R. Derradi de Souza, M. J. Skoby, Bernd Surrow, M. Wada, T. Pawlak, Z. J. Xu, H. M. Spinka, J. L. Zhang, W. Q. Shen, J. Sandweiss, R. Witt, F. Zhao, A. Kesich, W. Zha, Gerald W Hoffmann, I. Kulakov, A. Banerjee, Xiang Sun, A. B. Cudd, A. Sarkar, W. B. Schmidke, S. Mioduszewski, J. Porter, S. Trentalange, C. A. Gagliardi, R. Cendejas, Ivan Kisel, Donald M. McDonald, M. Pachr, Stephen V. Gliske, Prithwish Tribedy, B. K. Srivastava, D. Garand, A. Chikanian, Lokesh Kumar, W. J. Llope, Jaroslav Bielcik, Michal Sumbera, Sevil Salur, Y. Wang, Xiangming Sun, H. G. Ritter, O. V. Rogachevskiy, H. J. Jang, S. Bültmann, A. Ohlson, S. W. Wissink, J. W. Harris, Radoslaw Antoni Kycia, Y. Zhang, E. Sangaline, D. Arkhipkin, A. Hamed, Nikola Poljak, I. G. Alekseev, P. Yepes, A. Davila Leyva, A. H. Tang, M. A. Lisa, N. K. Pruthi, I. Bunzarov, M. Calderon De La Barca Sanchez, Y. F. Wu, Wei Xie, J. G. Cramer, A. Aparin, G. M.S. Vasconcelos, Y. Pandit, N. Schmitz, E. Shahaliev, M. R. Girard, J. L. Romero, E. Finch, E. W. Oldag, T. J. Humanic, H. Z. Huang, S. Vokal, R. Varma, B. S. Page, D. P. Kikola, B. Stringfellow, T. S. McShane, J. H. Chen, S. S. Shi, P. Bhattarai, M. A. Szelezniak, D. A. Morozov, Thorsten Sven Kollegger, Y. J. Sun, D. Kalinkin, C. Dilks, S. Heppelmann, S. Kabana, Y. P. Viyogi, L. Eun, J. B. Zhang, D. D. Koetke, J. E. Draper, S. Ramachandran, O. Eyser, M. M. Mondal, M. Shao, Y. X. Pan, G. Van Buren, J. M. Nelson, W. Peryt, C. Yang, David Jonathan Hofman, M. J.M. Codrington, H. Masui, J. Takahashi, S. B. Nurushev, S. Fazio, Haiyan Wang, P. V. Shanmuganathan, L. E. Dunkelberger, A. A. Derevschikov, Jana Bielcikova, P. Sorensen, L. Didenko, Zhiming Li, Maksym Zyzak, J. C. Webb, Xiaofeng Luo, and Guo-Liang Ma

Subjects
Physics, Particle physics, Scattering, media_common.quotation_subject, General Physics and Astronomy, Parton, Polarization (waves), Asymmetry, Gluon, Nuclear physics, Distribution function, High Energy Physics::Experiment, Nuclear Experiment, Relativistic Heavy Ion Collider, media_common
Abstract

We report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, A_{LL}, in polarized pp collisions at center-of-mass energy sqrt[s]=200 GeV. The STAR data place stringent constraints on polarized parton distribution functions extracted at next-to-leading order from global analyses of inclusive deep-inelastic scattering (DIS), semi-inclusive DIS, and RHIC pp data. The measured asymmetries provide evidence at the 3σ level for positive gluon polarization in the Bjorken-x region x>0.05.

Published
2015
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38. Measurements of dielectron production in Au + Au collisions atsNN=200GeV from the STAR experiment

Author

Zhigang Xiao, S. Fazio, Jorn Henning Putschke, A. V. Brandin, Bernd Surrow, J. C. Dunlop, L. Wen, Nasim, K. Xin, Z. H. Khan, N. G. Minaev, J. W. Harris, J. Engelage, Xiangming Sun, P. Bhattarai, Isaac Upsal, Zubayer Ahammed, W. B. Schmidke, J. Porter, T. P. Burton, G. Nigmatkulov, C. A. Gagliardi, N. Yu, J. M. Landgraf, M. Strikhanov, J. Sandweiss, Q. H. Xu, Kejun Kang, L. V. Nogach, Haiyan Wang, Michal Sumbera, J. K. Adkins, Ivan Kisel, Jaroslav Bielcik, Zhiming Li, Sumit R. Das, M. A. Szelezniak, R. Fatemi, L. He, G. Van Nieuwenhuizen, Zongye Zhang, J. L. Romero, Anik Gupta, P. Yepes, D. Tlusty, I. G. Bordyuzhin, Mirko Planinic, K. Krueger, D. L. Olvitt, Maksym Zyzak, N. Xu, Frank Jm Geurts, P. Seyboth, O. V. Rogachevskiy, H. J. Jang, P. Chaloupka, P. Filip, P. Pile, G. D. Westfall, S. W. Wissink, A. H. Tang, Q. Y. Shou, Yi-Fei Xu, J. C. Webb, Y. J. Sun, C. Dilks, A. M. Poskanzer, Z. Ye, I. Bunzarov, N. K. Pruthi, M. J. Skoby, L. Fulek, Madan M. Aggarwal, Fuqiang Wang, X. Li, Z. J. Xu, Leszek Adamczyk, S. Trentalange, M. K. Mustafa, Nikola Poljak, K. Yip, A. Roy, J. S. Wang, K. Meehan, R. Pak, J. L. Drachenberg, Olga Evdokimov, Barbara Antonina Trzeciak, M. Cherney, X. Huang, A. Kechechyan, P. Federic, A. Manion, Pradip Kumar Sahu, Y. P. Viyogi, T. J. Humanic, L. C. Bland, R. R. Debbe, C-Q. Li, Y. F. Wu, S. H. Zhang, A. Vossen, Lokesh Kumar, G. Eppley, I. Kulakov, Y. Li, M. Calderon De La Barca Sanchez, A. I. Hamad, A. Peterson, M. Vandenbroucke, Hua Pei, S. K. Tripathy, R. P. Scharenberg, Christina Markert, Z. Chang, J. Rusnak, Abdel Nasser Tawfik, A. F. Kraishan, J. Pluta, D. Smirnov, B. Pawlik, H. Qiu, O. Rusnakova, L. Ruan, Jay Roberts, J. M. Campbell, I. K. Yoo, H. S. Matis, M. Tokarev, W. Li, A. Gibson, K. Poniatowska, Zebo Tang, Jana Bielcikova, B. Huang, S. K. Gupta, R. Varma, Giacomo Contin, R. Haque, Radoslaw Antoni Kycia, Leo Clifford Greiner, B. S. Page, Rene Bellwied, Basanta Kumar Nandi, T. D. S. Stanislaus, R. S. Longacre, M. Posik, H. W. Ke, T. G. Dedovich, I. G. Alekseev, L. K. Kosarzewski, D. P. Kikola, R. E. Tribble, C. E. Flores, Nihar Sahoo, Y. Wang, H. H. Wieman, Y. Fisyak, H. M. Spinka, B. Stringfellow, Sergey Voloshin, P. Sorensen, E. G. Judd, X. C. Chen, W. W. Jacobs, Wei Xie, V. A. Okorokov, Gerald W Hoffmann, P. Huck, Lin Ma, M. A. Lisa, C. Perkins, K. Oh, B. Di Ruzza, I. Sakrejda, J. Lauret, A. Banerjee, A. Aparin, Junjie Zhang, O. D. Tsai, Bedangadas Mohanty, Xiaofeng Luo, K. Jiang, G. Igo, G. Odyniec, Y. Pandit, Anthony Robert Timmins, J. Novak, Adam Ryszard Kisiel, Y. Zoulkarneeva, N. Svirida, Mukesh Sharma, G. Wang, B. Sharma, J. Bouchet, N. Schmitz, H. J. Crawford, L. Didenko, I. Chakaberia, R. Lednicky, L. Kochenda, T. Tarnowsky, Anju Bhasin, Guo-Liang Ma, L. Yi, E. Shahaliev, J. H. Thomas, K. D. Landry, J. Butterworth, D. Arkhipkin, A. Hamed, H. G. Ritter, R. Witt, M. C. Cervantes, Z. J. Sun, A. Lebedev, Nilay Shah, Rafal Sikora, P. V. Shanmuganathan, L. P. Zhou, M. R. Girard, S. Mioduszewski, L. Song, L. E. Dunkelberger, Donald M. McDonald, Prithwish Tribedy, Jian Deng, A. S. Hirsch, B. K. Srivastava, W. Q. Shen, R. Vertesi, G. Agakishiev, D. S. Gunarathne, A. A. Derevschikov, P. Kravtsov, A. M. Schmah, D. Cebra, F. Liu, Xiaofeng Zhu, S. Kabana, Xiang Sun, A. Ogawa, R. D. Majka, J. Schambach, F. Videbæk, G. Webb, W. Christie, Sukalyan Chattopadhyay, Andrey Vasiliev, Janet Elizabeth Seger, Yifei Zhang, Z. Feng, M. Lomnitz, M. Stepanov, G. S. Averichev, K. Kauder, D. Garand, Sevil Salur, Y. Panebratsev, D. Grosnick, A. K. Bhati, D. Keane, Nikolai Smirnov, R. Stock, L. G. Efimov, T. K. Nayak, M. Shao, Y. X. Pan, G. Van Buren, S. S. Shi, C. Yang, David Jonathan Hofman, H. Masui, S. B. Nurushev, M. A.C. Lamont, S. Y. Noh, Roli Esha, Yu-Gang Ma, Jie Zhao, S. Horvat, Xuan Zhang, Hanna Paulina Zbroszczyk, M. Simko, W. Zha, Kurt Jung, A. Sarkar, W. J. Llope, J. Alford, W. Guryn, J. Fedorisin, H. Z. Huang, S. Vokal, D. G. Underwood, Q. Yang, J. Cheng, Yang Yang, L. C. De Silva, Shangfeng Yang, J. H. Chen, D. A. Morozov, Thorsten Sven Kollegger, D. Kalinkin, S. Heppelmann, B. J. Summa, J. B. Zhang, D. D. Koetke, J. E. Draper, S. Ramachandran, O. Eyser, M. M. Mondal, C. Zhong, E. C. Aschenauer, S. Margetis, X. Dong, Y. Guo, Jongmin Lee, R. L. Ray, R. Ma, T. Ljubicic, Niseem Magdy, H. Caines, Sudhir Raniwala, A. Quintero, E. P. Sichtermann, Rashmi Raniwala, T. Ullrich, C. M. Du, and H. S. Xu

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Hadron, Phi meson, Super Proton Synchrotron, Nuclear physics, Quark–gluon plasma, High Energy Physics::Experiment, Multiplicity (chemistry), Nuclear Experiment, Nucleon, Relativistic Heavy Ion Collider, STAR detector
Abstract

We report on measurements of dielectron (e(+) e(-)) production in Au + Au collisions at a center-of-mass energy of 200 GeV per nucleon-nucleon pair using the STAR detector at BNL Relativistic Heavy Ion Collider. Systematic measurements of the dielectron yield as a function of transverse momentum (p(T)) and collision centrality show an enhancement compared to a cocktail simulation of hadronic sources in the low invariant-mass region (M-ee < 1 GeV / c(2)). This enhancement cannot be reproduced by the rho-meson vacuum spectral function. In minimum-bias collisions, in the invariant-mass range of 0.30-0.76 GeV / c(2), integrated over the full pT acceptance, the enhancement factor is 1.76 +/- 0.06 (stat.) +/- 0.26 (sys.) +/- 0.29 (cocktail). The enhancement factor exhibits weak centrality and pT dependence in STAR's accessible kinematic regions, while the excess yield in this invariant-mass region as a function of the number of participating nucleons follows a power-law shape with a power of 1.44 +/- 0.10. Models that assume an in-medium broadening of the rho-meson spectral function consistently describe the observed excess in these measurements. Additionally, we report on measurements of omega-and phi-meson production through their e+ e(-) decay channel. These measurements show good agreement with Tsallis blast-wave model predictions, as well as, in the case of the phi meson, results through its K+ K- decay channel. In the intermediate invariant-mass region (1.1 < Mee < 3 GeV / c(2)), we investigate the spectral shapes from different collision centralities. Physics implications for possible in-medium modification of charmed hadron production and other physics sources are discussed.

Published
2015
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39. Energy dependence ofKπ,pπ, andKpfluctuations in Au + Au collisions fromsNN=7.7to 200 GeV

Author

J. W. Harris, H. Qiu, Vitaly Okorokov, M. Tokarev, E. P. Sichtermann, Bernd Surrow, Mukesh Sharma, G. Wang, T. D. S. Stanislaus, K. Poniatowska, S. K. Gupta, Rashmi Raniwala, H. H. Wieman, Giacomo Contin, I. K. Yoo, R. Haque, Q. H. Xu, E. G. Judd, J. Porter, Nihar Sahoo, W. B. Schmidke, Michal Sumbera, C. A. Gagliardi, Z. J. Sun, T. Ullrich, S. W. Wissink, Y. Zhang, Nikola Poljak, P. Yepes, Ivan Kisel, X. C. Chen, J. C. Dunlop, L. Wen, A. H. Tang, P. Huck, Nasim, Jaroslav Bielcik, L. Kotchenda, J. E. Draper, N. Magdy, Bedangadas Mohanty, C. M. Du, Xiaofeng Luo, I. Bunzarov, Zhigang Xiao, A. Peterson, Anthony Robert Timmins, Adam Ryszard Kisiel, O. V. Rogachevskiy, Zubayer Ahammed, Guo-Liang Ma, H. S. Xu, H. J. Jang, A. M. Poskanzer, Z. Ye, Xuan Zhang, A. I. Hamad, D. Solanki, Q. Y. Shou, B. Huang, H. J. Crawford, R. S. Longacre, J. H. Thomas, M. Calder On De La Barca S'Anchez, M. J. Skoby, L. Fulek, X. Huang, A. Kechechyan, N. G. Minaev, J. L. Drachenberg, Olga Evdokimov, Barbara Antonina Trzeciak, M. K. Mustafa, Zebo Tang, Leo Clifford Greiner, Hanna Paulina Zbroszczyk, W. Christie, Pradip Kumar Sahu, B. Pawlik, A. Gibson, Jian Deng, G. Eppley, L. C. Bland, Y. Wang, Y. Fisyak, Lin Ma, P. Bhattarai, C. Perkins, G. Igo, J. Novak, B. Sharma, Y. Li, A. S. Hirsch, P. Kravtsov, A. M. Schmah, I. Sakrejda, K. Oh, Basanta Kumar Nandi, Y. F. Xu, S. Zhang, A. Sandacz, J. Bouchet, Madan M. Aggarwal, Fuqiang Wang, X. Li, Sergey Voloshin, Jay Roberts, N. Xu, P. Filip, G. Agakishiev, D. S. Gunarathne, G. S. Averichev, K. D. Landry, K. Kauder, J. Butterworth, P. Pile, G. D. Westfall, A. Manion, H. W. Ke, A. Vossen, Anik Gupta, P. Seyboth, D. N. Svirida, Isaac Upsal, Thorsten Sven Kollegger, Andrey Vasiliev, B. Di Ruzza, Z. Chang, J. Pluta, Zongye Zhang, D. Tlusty, I. G. Bordyuzhin, W. Li, Y. F. Wu, Leszek Adamczyk, T. P. Burton, D. Kalinkin, P. Federic, Z. H. Khan, Frank Jm Geurts, H. M. Spinka, H. G. Ritter, R. Witt, F. Videbæk, I. Kulakov, F. Zhao, Mirko Planinic, G. Webb, Rafal Sikora, A. Banerjee, Jifa Tian, J. L. Zhang, L. Yi, S. Mioduszewski, S. Kabana, Sukalyan Chattopadhyay, G. Odyniec, J. Y. Zhang, Rene Bellwied, J. Engelage, G. Nigmatkulov, A. Roy, N. Yu, S. Heppelmann, Y. Zoulkarneeva, C. Zhong, Kejun Kang, L. V. Nogach, Nilay Shah, K. Meehan, Donald M. McDonald, J. M. Landgraf, Sumit R. Das, J. Rusnak, R. E. Tribble, B. J. Summa, P. Chaloupka, Jorn Henning Putschke, A. F. Kraishan, W. J. Llope, G. Van Nieuwenhuizen, Prithwish Tribedy, B. K. Srivastava, A. V. Brandin, M. Strikhanov, L. Ruan, Z. J. Xu, S. Trentalange, K. Xin, J. M. Campbell, Gerald W Hoffmann, Janet Elizabeth Seger, J. Sandweiss, M. Lomnitz, T. G. Dedovich, M. A. Szelezniak, D. Arkhipkin, A. Hamed, D. L. Olvitt, M. A.C. Lamont, S. Y. Noh, Xiangming Sun, K. Yip, J. S. Wang, R. R. Debbe, M. Vandenbroucke, C. Yang, David Jonathan Hofman, M. J.M. Codrington, H. Masui, R. Vertesi, N. K. Pruthi, Y. J. Sun, Wei Xie, J. B. Zhang, D. D. Koetke, J. Takahashi, A. Aparin, S. B. Nurushev, C. Dilks, C-Q. Li, S. Ramachandran, F. Liu, Y. Pandit, N. Schmitz, O. Eyser, Radoslaw Antoni Kycia, E. Shahaliev, M. Shao, Y. X. Pan, G. Van Buren, M. M. Mondal, R. P. Scharenberg, Christina Markert, D. Smirnov, O. Rusnakova, H. Z. Huang, S. Vokal, H. S. Matis, I. G. Alekseev, M. A. Lisa, Y. P. Viyogi, Shangfeng Yang, L. K. Kosarzewski, J. H. Chen, S. S. Shi, R. D. Majka, W. W. Jacobs, D. A. Morozov, T. J. Humanic, J. Schambach, J. Lauret, Anju Bhasin, A. Lebedev, Y. G. Ma, R. Lednicky, T. Tarnowsky, S. Fazio, Abdel Nasser Tawfik, Xiaofeng Zhu, A. Ogawa, R. Varma, B. S. Page, D. P. Kikola, B. Stringfellow, Haiyan Wang, M. R. Girard, C. E. Flores, Y. Guo, Jongmin Lee, R. L. Ray, R. Ma, T. Ljubicic, H. Caines, Sudhir Raniwala, A. Quintero, E. C. Aschenauer, J. K. Adkins, R. Fatemi, L. He, S. Margetis, K. Krueger, X. Dong, M. Cherney, Lokesh Kumar, Hua Pei, S. K. Tripathy, P. V. Shanmuganathan, S. R. Klein, L. E. Dunkelberger, A. A. Derevschikov, Zhiming Li, Maksym Zyzak, J. C. Webb, Jana Bielcikova, P. Sorensen, L. Didenko, I. Chakaberia, D. G. Underwood, Q. Yang, J. Cheng, Yang Yang, L. C. De Silva, Y. Panebratsev, D. Grosnick, Feng, J. Alford, W. Guryn, J. Fedorisin, Roli Esha, Jie Zhao, S. Horvat, O. D. Tsai, J. L. Romero, M. Simko, T. Pawlak, M. C. Cervantes, W. Zha, L. Song, W. Q. Shen, D. Cebra, A. Sarkar, Xiang Sun, D. Garand, Sevil Salur, A. K. Bhati, D. Keane, Nikolai Smirnov, R. Stock, L. G. Efimov, and T. K. Nayak

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Observable, Collision, 01 natural sciences, 7. Clean energy, Particle identification, Nuclear physics, Critical point (thermodynamics), 0103 physical sciences, Quark–gluon plasma, Heavy ion, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

© 2015 American Physical Society. ©2015 American Physical Society. A search for the quantum chromodynamics (QCD) critical point was performed by the STAR experiment at the BNL Relativistic Heavy Ion Collider, using dynamical fluctuations of unlike particle pairs. Heavy ion collisions were studied over a large range of collision energies with homogeneous acceptance and excellent particle identification, covering a significant range in the QCD phase diagram where a critical point may be located. Dynamical Kπ, pπ, and Kp fluctuations as measured by the STAR experiment in central 0-5% Au + Au collisions from center-of-mass collision energies sNN=7.7 to 200 GeV are presented. The observable νdyn was used to quantify the magnitude of the dynamical fluctuations in event-by-event measurements of the Kπ, pπ, and Kp pairs. The energy dependences of these fluctuations from central 0-5% Au + Au collisions all demonstrate a smooth evolution with collision energy.

Published
2015
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40. Charged-to-neutral correlation at forward rapidity in Au + Au collisions atsNN=200GeV

Author

Y. Zoulkarneeva, C. Zhong, Y. Guo, Guo-Liang Ma, Zhigang Xiao, R. L. Ray, I-K. Yoo, Li Yi, T. Ljubicic, N. G. Minaev, R. Varma, A. S. Hirsch, B. S. Page, D. P. Kikola, T. Kollegger, W. J. Llope, P. Kravtsov, A. M. Schmah, Dmitry Smirnov, H. Caines, Sudhir Raniwala, J. C. Webb, S. Ramachandran, A. Quintero, B. Stringfellow, F. Liu, Stephen V. Gliske, Miroslav Simko, Mariusz Przybycien, Hao Qiu, H. G. Ritter, P. Filip, L. C. De Silva, Vitaly Okorokov, Michal Sumbera, E. P. Sichtermann, L. C. Bland, N. Xu, P. Pile, G. D. Westfall, S. Bültmann, J. Porter, Y. F. Xu, Bernd Surrow, J. Putschke, Rashmi Raniwala, Nasim, R. D. Majka, J. G. Cramer, S. W. Wissink, Y. Zhang, J. L. Drachenberg, A. Sandacz, John Nelson, Y.X. Pan, A. Gupta, Ivan Kisel, D. N. Svirida, Alice Elisabeth Ohlson, W. Borowski, J. Schambach, Nikola Poljak, M. R. Girard, D. Solanki, M. Tokarev, J. E. Draper, A. Ogawa, Jian Deng, T. Ullrich, Xuan Zhang, H. F. Chen, D. G. Underwood, D. L. Olvitt, C. A. Gagliardi, C. Yang, G. Agakishiev, D. S. Gunarathne, H. W. Ke, Jun-jie Zhang, C. M. Du, H. S. Xu, L. Eun, S. K. Das, E. W. Oldag, T. S. McShane, L. Kotchenda, P. Bhattarai, D. Tlusty, B. Pawlik, B. Huang, Lisa, M. J.M. Codrington, D. J. Hofman, F. Ding, Xiangyuan Cui, W. Christie, Hanna Paulina Zbroszczyk, D. R. Beavis, C-Q. Li, Madan M. Aggarwal, Fuqiang Wang, J. Rusnak, Basanta Kumar Nandi, A. F. Kraishan, P. Djawotho, R. P. Scharenberg, Christina Markert, O. Rusnakova, H. S. Matis, X. L. Wang, M. M. Mondal, J. Cheng, T. J. M. Symons, Andrey Vasiliev, J. Takahashi, T. D. S. Stanislaus, M. A. C. Lamont, S. B. Nurushev, S.Y. Noh, A. Roy, C. E. Flores, E. G. Judd, A. Kechechyan, N.R. Sahoo, X.G. Li, S. Zhang, H. H. Wieman, Szelezniak, E. C. Aschenauer, L. K. Kosarzewski, S. Margetis, R. Witt, L. Ruan, C. D. Anson, J. Novak, A. Vossen, F. Videbæk, Z. Chang, Li-Yi Chen, N. K. Pruthi, G. Eppley, P. Sorensen, W. W. Jacobs, J.H. Lee, F. Zhao, J. M. Campbell, J. Turnau, J. Lauret, K. Xin, Y. J. Sun, A. M. Poskanzer, X. Dong, G. Webb, Z. H. Khan, C. Dilks, Bedangadas Mohanty, Sukalyan Chattopadhyay, Justin Stevens, B. Di Ruzza, Jie Zhao, S. Horvat, M. Shao, G. Van Buren, A. Chikanian, Anju Bhasin, J. W. Harris, S. S. Shi, S. Kabana, Y. P. Viyogi, Z.P. Zhang, J. Pluta, M. Zyzak, W. Li, Jana Bielcikova, K. Kang, R. Lednicky, J.M. Landgraf, M. K. Mustafa, J. F. Ross, Robert Vertesi, Radoslaw Antoni Kycia, J. Engelage, Z.M. Li, Jaroslav Bielcik, Z. Ye, A. Lebedev, A. Banerjee, W. Zha, M. Wada, W.B. Schmidke, T. J. Humanic, G. Nigmatkulov, T. G. Dedovich, X. Huang, Rene Bellwied, Wei Xie, Y. Li, E. Sangaline, D. Arkhipkin, Prithwish Tribedy, L-X. Han, J. L. Zhang, B. K. Srivastava, M. Lomnitz, J. H. Thomas, A. Hamed, P. Yepes, S.G. Brovko, A. Davila Leyva, S. Mioduszewski, X. G. Luo, Pradip Kumar Sahu, O. V. Rogachevskiy, H. J. Jang, R.E. Tribble, J. Alford, D. P. Mahapatra, S. Fazio, I. G. Bordyuzhin, X. Zhu, Y. H. Zhu, Y. Wang, Mirko Planinic, W. Guryn, I. G. Alekseev, A. H. Tang, A. Aparin, D. D. Koetke, G. M.S. Vasconcelos, L. Didenko, M. Strikhanov, J. Konzer, Haiyan Wang, G. S. Averichev, J. Fedorisin, D.R. Gangadharan, T. P. Burton, H. Masui, Gerald W Hoffmann, K.S. Engle, M. Calderon De La Barca Sanchez, Yu-Gang Ma, P. V. Shanmuganathan, I. Bunzarov, Y. Pandit, G. Odyniec, J. Sandweiss, X. M. Sun, N. Schmitz, J. C. Dunlop, E. Shahaliev, T. Tarnowsky, M.J. Skoby, L. E. Dunkelberger, Zubayer Ahammed, I. Koralt, N. Yu, L. V. Nogach, D. McDonald, A. A. Derevschikov, W. Yan, T. Pawlak, P. Chaloupka, Amal Sarkar, Q. Y. Shou, S. Trentalange, H.M. Spinka, Olga Evdokimov, Barbara Antonina Trzeciak, Y. F. Wu, Jay Roberts, K. Krueger, B. Haag, Zebo Tang, Janusz Chwastowski, Leo Clifford Greiner, C. Perkins, Frank Jm Geurts, K. Poniatowska, P. Seyboth, S. K. Gupta, Giacomo Contin, Leszek Adamczyk, R. Derradi de Souza, P. Huck, Anthony Robert Timmins, Adam Ryszard Kisiel, H. J. Crawford, J. K. Adkins, I. Kulakov, R. Fatemi, J. A. Vanfossen, M. Cherney, Lokesh Kumar, A. V. Brandin, Hua Pei, J. Seger, Y. Panebratsev, D. Grosnick, G. Wang, Z. Z. Xu, J.L. Romero, A. Kesich, R. Cendejas, Nikita Smirnov, Z. J. Sun, A. K. Bhati, D. Keane, R. Stock, Xu Sun, K. Yip, J. S. Wang, R. R. Debbe, C. K. Riley, Rihan Haque, H. Z. Huang, L. G. Efimov, T. K. Nayak, O. D. Tsai, S. Vokal, M. C. Cervantes, Q. H. Xu, W. Q. Shen, G. J. van Nieuwenhuizen, D. Cebra, D. Garand, Y. Fisyak, Maxence Vandenbroucke, Sevil Salur, K. Oh, J. Xu, I. Sakrejda, Y. Yang, Nilay Shah, J. H. Chen, D. A. Morozov, D. Kalinkin, R. S. Longacre, S. Heppelmann, O. Eyser, G. Igo, B. Sharma, J. Bouchet, K. D. Landry, K. Kauder, J. Butterworth, H. Bichsel, and A. Gibson

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, 01 natural sciences, Charged particle, Nuclear physics, Particle decay, Pion, Isospin, 0103 physical sciences, Quark–gluon plasma, Rapidity, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

Event-by-event fluctuations of the multiplicities of inclusive charged particles and photons at forward rapidity in Au + Au collisions at root s(NN) = 200 GeV have been studied. The dominant contribution to such fluctuations is expected to come from correlated production of charged and neutral pions. We search for evidence of dynamical fluctuations of different physical origins. Observables constructed out of moments of multiplicities are used as measures of fluctuations. Mixed events and model calculations are used as base lines. Results are compared to the dynamical net-charge fluctuations measured in the same acceptance. A nonzero statistically significant signal of dynamical fluctuations is observed in excess to the model prediction when charged particles and photons are measured in the same acceptance. We find that, unlike dynamical net-charge fluctuation, charge-neutral fluctuation is not dominated by correlation owing to particle decay. Results are compared to the expectations based on the generic production mechanism of pions owing to isospin symmetry, for which no significant (

Published
2015
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41. ΛΛCorrelation Function inAu+AuCollisions atsNN=200 GeV

Author

J. G. Cramer, Rashmi Raniwala, Michal Sumbera, L. Kotchenda, M. R. Girard, S. Bültmann, D. L. Olvitt, Amal Sarkar, T. Ullrich, S. W. Wissink, E. W. Oldag, Y. Zhang, Nikola Poljak, C. M. Du, H. S. Xu, L. Eun, J. E. Draper, M. K. Mustafa, P. V. Shanmuganathan, B. Haag, T. Tarnowsky, L. E. Dunkelberger, Y. Guo, Jongmin Lee, Y. Li, A. K. Bhati, D. Keane, Haiyan Wang, J. Rusnak, Z. Ye, H. W. Ke, A. F. Kraishan, S. Fazio, Olga Evdokimov, Barbara Antonina Trzeciak, R. Stock, Jay Roberts, K. Krueger, L. G. Efimov, D. P. Mahapatra, L. Ruan, X. Huang, Zebo Tang, Janusz Chwastowski, Q. H. Xu, A. Kechechyan, I. G. Bordyuzhin, Mirko Planinic, T. Ljubicic, A. A. Derevschikov, T. K. Nayak, D. G. Underwood, F. Videbæk, G. Eppley, X. M. Sun, C. D. Anson, O. D. Tsai, H. Caines, Sudhir Raniwala, Pradip Kumar Sahu, J. Xu, G. Webb, Leo Clifford Greiner, J. M. Campbell, J. Turnau, P. Sorensen, Sukalyan Chattopadhyay, A. Quintero, R. Cendejas, M. C. Cervantes, Stephen V. Gliske, Rihan Haque, M. Shao, Y. X. Pan, G. Van Buren, J. W. Harris, Bedangadas Mohanty, W. Q. Shen, R. Varma, B. S. Page, P. Seyboth, D. P. Kikola, S. S. Shi, Robert Vertesi, T. G. Dedovich, H. Z. Huang, S. Vokal, H. G. Ritter, D. Garand, B. Stringfellow, T. S. McShane, C. Perkins, J. Pluta, Madan M. Aggarwal, D. Solanki, M. Zyzak, P. Bhattarai, Fuqiang Wang, J. H. Thomas, Wenbin Yan, J. Engelage, Zhigang Xiao, Sevil Salur, Leszek Adamczyk, R. Derradi de Souza, J. M. Nelson, G. Nigmatkulov, M. Tokarev, W. Li, F. Ding, R. S. Longacre, Y. Panebratsev, Y. Wang, N. G. Minaev, D. Grosnick, Y. J. Sun, H. Masui, J. H. Chen, Anju Bhasin, C. Dilks, Rajarshi Ray, L. Didenko, P. Yepes, A. Davila Leyva, Y. F. Xu, X. G. Luo, S. Kabana, J. Cheng, Zhiming Li, I. Koralt, M. Wada, Y. G. Ma, C. Yang, Rene Bellwied, Y. H. Zhu, T. D. S. Stanislaus, X. L. Wang, I. Kulakov, M. J. M. Codrington, E. C. Aschenauer, S. Margetis, S. G. Brovko, Jian Deng, Y. P. Viyogi, N. Xu, P. Filip, X. Dong, M. Lomnitz, G. Igo, J. Novak, B. Sharma, J. Bouchet, K. D. Landry, R. E. Tribble, Jize Zhao, H. H. Wieman, K. Kauder, Gerald W Hoffmann, N. Yu, L. V. Nogach, D. A. Morozov, Alice Elisabeth Ohlson, M. J. Skoby, Frank Jm Geurts, A. H. Tang, Z. Z. Xu, Nikita Smirnov, I. Bunzarov, K. Kang, A. Lebedev, J. M. Landgraf, P. Pile, G. D. Westfall, S. Das, A. Gupta, Justin Stevens, D. J. Hofman, D. Kalinkin, G. Agakishiev, D. S. Gunarathne, G. Wang, T. J. M. Symons, L. C. De Silva, M. Strikhanov, A. Vossen, S. Heppelmann, J. Konzer, Guo-Liang Ma, D. N. Svirida, G. S. Averichev, J. Takahashi, M. A. C. Lamont, J. Porter, I. K. Yoo, G. Odyniec, J. Sandweiss, D. Cebra, P. Djawotho, S. Ramachandran, O. Eyser, Li Yi, S. B. Nurushev, B. Huang, Aditi Banerjee, Ivan Kisel, Z. J. Sun, Z. P. Zhang, A. S. Hirsch, M. M. Mondal, D. Tlusty, T. Kollegger, C. E. Flores, E. G. Judd, P. Kravtsov, A. M. Schmah, Dmitry Smirnov, F. Liu, Miroslav Simko, Mariusz Przybycien, L. C. Bland, C. K. Riley, D. R. Gangadharan, Niladribihari Sahoo, N. K. Pruthi, Radoslaw Antoni Kycia, Jaroslav Bielcik, Z. H. Khan, Jie Zhang, G. J. van Nieuwenhuizen, M. A. Szelezniak, I. G. Alekseev, M. A. Lisa, Md. Nasim, M. Calderon De La Barca Sanchez, Y. Fisyak, R. D. Majka, J. L. Drachenberg, A. Roy, K. Oh, O. V. Rogachevskiy, H. J. Jang, W. Borowski, Z. Chang, J. Schambach, Xiangyuan Cui, W. Christie, H. Bichsel, A. Gibson, Y. Zoulkarneeva, C. Zhong, D. D. Koetke, Andrey Vasiliev, Li-Zhu Chen, X.G. Li, Vitaly Okorokov, J. C. Dunlop, Bernd Surrow, Zubayer Ahammed, Janet Elizabeth Seger, H. M. Spinka, Q. Y. Shou, J. M. Butterworth, W. B. Schmidke, R. Witt, J. C. Webb, S. Mioduszewski, Donald M. McDonald, C. A. Gagliardi, Prithwish Tribedy, B. K. Srivastava, Wei Xie, A. Aparin, G. M.S. Vasconcelos, Hao Qiu, Y. Pandit, N. Schmitz, E. Shahaliev, Jana Bielcikova, J. L. Romero, Y. F. Wu, J. Putschke, Xiaofeng Zhu, A. Ogawa, H. F. Chen, C-Q. Li, I. Sakrejda, R. P. Scharenberg, Christina Markert, J. Alford, O. Rusnakova, W. Guryn, H. S. Matis, J. Fedorisin, L. K. Kosarzewski, B. Di Ruzza, S. Horvat, T. Pawlak, W. Zha, W. W. Jacobs, J. Lauret, R. Lednicky, J. F. Ross, Y. Yang, Nilay Shah, K. Yip, J. S. Wang, R. R. Debbe, K. Poniatowska, Maxence Vandenbroucke, S. K. Gupta, Giacomo Contin, P. Huck, A. V. Brandin, Anthony Robert Timmins, K. Xin, Adam Ryszard Kisiel, H. J. Crawford, J. K. Adkins, R. Fatemi, J. A. Vanfossen, A. Kesich, M. Cherney, Xiangming Sun, K. S. Engle, Lokesh Kumar, Hua Pei, B. Pawlik, Basanta Kumar Nandi, S. Zhang, A. M. Poskanzer, T. P. Burton, P. Chaloupka, S. Trentalange, A. Chikanian, T. J. Humanic, E. Sangaline, D. Arkhipkin, A. Hamed, L-X. Han, S. Y. Noh, J. L. Zhang, W. J. Llope, Xuan Zhang, Hanna Paulina Zbroszczyk, D. R. Beavis, F. Zhao, and E. P. Sichtermann

Subjects
Physics, Particle physics, General Physics and Astronomy, Production (computer science), Function (mathematics), Correlation function (quantum field theory), Nuclear Experiment, Lambda
Abstract

A high statistics measurement of the $\mathrm{\ensuremath{\Lambda}}\phantom{\rule{0}{0ex}}\mathrm{\ensuremath{\Lambda}}$ correlation function in heavy-ion collisions at RHIC suggests that the strength of the interaction is weak and provides a new limit on H-dibaryon production.

Published
2015
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42. On the Singularities of the Emden–Fowler Type Equations

Author

Galina Filipuk and Radoslaw Antoni Kycia

Subjects
Physics, Nonlinear Sciences::Exactly Solvable and Integrable Systems, Mathematics::Operator Algebras, Mathematics::Analysis of PDEs, Structure (category theory), Gravitational singularity, Type (model theory), Mathematical physics
Abstract

We study the Emden–Fowler type equations and their analytic solutions at the origin. We explain the structure of movable singularities of these solutions and visualize them numerically.

Published
2015
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43. Dielectron azimuthal anisotropy at mid-rapidity in Au + Au collisions atsNN=200GeV

Author

T. P. Burton, M. K. Mustafa, Y. Li, D. P. Mahapatra, Y. Xu, P. Chaloupka, Z. J. Xu, H. Z. Huang, S. Vokal, S. Trentalange, H. Qiu, J. H. Chen, S. S. Shi, M. Tokarev, J. Turnau, J. K. Adkins, R. Fatemi, T. D. S. Stanislaus, K. Krueger, T. G. Dedovich, H. H. Wieman, J. A. Vanfossen, D. A. Morozov, M. Cherney, A. M. Poskanzer, Z. Ye, K. S. Engle, Hua Pei, X. Huang, A. Kechechyan, Pradip Kumar Sahu, J. L. Romero, S. K. Gupta, Giacomo Contin, Nihar Sahoo, P. Huck, Anthony Robert Timmins, Adam Ryszard Kisiel, E. Finch, Xiangyuan Cui, W. Christie, H. J. Crawford, Andrey Vasiliev, Xuan Zhang, D. G. Underwood, S. Fazio, R. S. Longacre, Hanna Paulina Zbroszczyk, Janet Elizabeth Seger, D. R. Beavis, Wei Xie, J. W. Harris, R. Vertesi, A. Aparin, G. M.S. Vasconcelos, Haiyan Wang, F. Zhao, F. Liu, Thorsten Sven Kollegger, Mariusz Przybycien, Y. Pandit, G. Igo, J. Novak, C. K. Riley, D. Kalinkin, J. Cheng, T. J. M. Symons, S. Heppelmann, M. A.C. Lamont, L-X. Han, S. Y. Noh, N. Schmitz, B. Sharma, J. G. Cramer, E. Shahaliev, C. Yang, David Jonathan Hofman, I. Koralt, M. J.M. Codrington, H. Masui, N. Yu, J. Bouchet, Kejun Kang, L. V. Nogach, L. Eun, K. D. Landry, J. B. Zhang, D. D. Koetke, L. C. De Silva, J. E. Draper, K. Kauder, J. Butterworth, Sumit R. Das, G. Van Nieuwenhuizen, S. Ramachandran, P. Yepes, A. Davila Leyva, O. Eyser, M. R. Girard, M. M. Mondal, X. L. Wang, R. D. Majka, A. H. Tang, J. Takahashi, S. B. Nurushev, E. C. Aschenauer, W. Borowski, H. Bichsel, G. Odyniec, Yu-Gang Ma, Y. Zoulkarneeva, C. Zhong, Y. Fisyak, J. Alford, M. Shao, Y. X. Pan, G. Van Buren, S. Margetis, J. Schambach, W. J. Llope, I. Bunzarov, W. Guryn, Anju Bhasin, K. Oh, E. W. Oldag, X. Dong, Q. H. Xu, Bernd Surrow, J. M. Nelson, J. Xu, J. C. Dunlop, A. Lebedev, S. K. Pal, Justin Stevens, T. J. Humanic, W. Peryt, A. Ohlson, R. N. Singaraju, Y. F. Wu, Zubayer Ahammed, M. J. LeVine, J. Fedorisin, W. B. Schmidke, E. P. Sichtermann, G. Wang, C. A. Gagliardi, R. Varma, M. Pachr, B. S. Page, P. V. Shanmuganathan, D. P. Kikola, Lokesh Kumar, Rashmi Raniwala, Jie Zhao, B. Stringfellow, T. S. McShane, P. Bhattarai, Q. Y. Shou, S. Horvat, Z. J. Sun, L. E. Dunkelberger, M. A. Szelezniak, T. Ullrich, J. L. Drachenberg, Olga Evdokimov, Barbara Antonina Trzeciak, T. Pawlak, Y. J. Sun, W. Zha, P. Seyboth, C. Dilks, S. Kabana, C. M. Du, Leszek Adamczyk, R. Derradi de Souza, A. Sarkar, Jian Deng, Y. P. Viyogi, H. S. Xu, M. Calderon De La Barca Sanchez, A. A. Derevschikov, Jay Roberts, G. Agakishiev, D. S. Gunarathne, Y. Guo, I. Kulakov, Jongmin Lee, R. L. Ray, D. Cebra, J. Porter, Zhiming Li, H. W. Ke, O. D. Tsai, B. Di Ruzza, Ivan Kisel, T. Ljubicic, M. C. Cervantes, Maksym Zyzak, H. Caines, Sudhir Raniwala, W. Q. Shen, A. Quintero, J. H. Thomas, R. Witt, Xiang Sun, Anik Gupta, S. Mioduszewski, D. Garand, J. C. Webb, Radoslaw Antoni Kycia, Y. Zawisza, Frank Jm Geurts, Donald M. McDonald, Sevil Salur, Y. Wang, Prithwish Tribedy, B. K. Srivastava, G. S. Averichev, I. G. Alekseev, M. A. Lisa, Michal Sumbera, F. Ding, Z. Chang, Li-Yi Chen, Y. Panebratsev, D. Grosnick, P. R. Pujahari, S. Bültmann, S. W. Wissink, Jana Bielcikova, D. L. Olvitt, B. Haag, A. Chikanian, H. M. Spinka, E. Sangaline, D. Arkhipkin, A. Hamed, P. Sorensen, A. Banerjee, Nikola Poljak, B. Pawlik, A. Gibson, Basanta Kumar Nandi, S. Zhang, Zebo Tang, V. A. Okorokov, Janusz Chwastowski, L. Didenko, Leo Clifford Greiner, A. K. Bhati, D. Keane, S. Dhamija, I. K. Yoo, Nikolai Smirnov, R. Stock, C. Perkins, Xiaofeng Luo, Guo-Liang Ma, L. G. Efimov, T. K. Nayak, R. Haque, Z. P. Zhang, C. E. Flores, E. G. Judd, A. S. Hirsch, P. Kravtsov, A. M. Schmah, C. D. Anson, Bedangadas Mohanty, M. Wada, F. Videbæk, G. Webb, Sukalyan Chattopadhyay, Yifei Zhang, M. Lomnitz, N. Xu, P. Filip, Stephen V. Gliske, G. Eppley, P. Pile, G. D. Westfall, Xiaofeng Zhu, J. Pluta, J. L. Zhang, A. Ogawa, H. F. Chen, W. Li, H. G. Ritter, Wenbin Yan, C-Q. Li, Zhigang Xiao, B. Huang, R. P. Scharenberg, Christina Markert, D. Smirnov, O. Rusnakova, N. G. Minaev, H. S. Matis, Rene Bellwied, A. Roy, X. Li, I. Sakrejda, Y. H. Zhu, R. E. Tribble, W. W. Jacobs, J. Rusnak, A. F. Kraishan, Jaroslav Bielcik, J. Lauret, L. Ruan, Gerald W Hoffmann, R. Lednicky, T. Tarnowsky, P. Djawotho, J. F. Ross, D. Tlusty, I. G. Bordyuzhin, Mirko Planinic, Y. Yang, O. V. Rogachevskiy, L. Yi, H. J. Jang, Nilay Shah, Jorn Henning Putschke, A. V. Brandin, L. C. Bland, J. Engelage, K. Xin, G. Nigmatkulov, S. G. Brovko, D. N. Svirida, J. M. Landgraf, Madan M. Aggarwal, Fuqiang Wang, M. Strikhanov, J. Konzer, A. Kesich, D. Solanki, Xiangming Sun, R. Cendejas, J. Sandweiss, M. J. Skoby, Nasim, K. Yip, A. Vossen, J. S. Wang, R. R. Debbe, M. Vandenbroucke, D. M.M.D. Madagodagettige Don, D. R. Gangadharan, N. K. Pruthi, Z. H. Khan, and L. Kotchenda

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 7. Clean energy, Particle identification, Nuclear physics, Azimuth, Transverse momentum, Quark–gluon plasma, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, Anisotropy, Relativistic Heavy Ion Collider, STAR detector
Abstract

We report on the first measurement of the azimuthal anisotropy (v2) of dielectrons (e+e− pairs) at mid-rapidity from √sNN=200 GeV Au + Au collisions with the STAR detector at the Relativistic Heavy Ion Collider (RHIC), presented as a function of transverse momentum (pT) for different invariant-mass regions. In the mass region Mee

Published
2014
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44. Observation ofD0Meson Nuclear Modifications inAu+AuCollisions atsNN=200 GeV

Author

P. Bhattarai, M. Shao, Y. X. Pan, G. Van Buren, G. Eppley, C. D. Anson, L. Kotchenda, D. L. Olvitt, J. M. Nelson, J. Pluta, P. R. Pujahari, H. Qiu, W. Peryt, W. Li, J. Turnau, M. K. Mustafa, Thorsten Sven Kollegger, Y. J. Sun, C. Dilks, B. Huang, Rene Bellwied, D. Kalinkin, Bedangadas Mohanty, T. G. Dedovich, M. Tokarev, Madan M. Aggarwal, Xuan Zhang, Hanna Paulina Zbroszczyk, D. R. Beavis, Y. Li, N. Xu, P. Filip, Fuqiang Wang, S. Kabana, Y. P. Viyogi, Y. H. Zhu, C. Yang, S. Heppelmann, R. E. Tribble, F. Zhao, David Jonathan Hofman, M. J.M. Codrington, H. Masui, Radoslaw Antoni Kycia, M. A.C. Lamont, L-X. Han, S. Y. Noh, Gerald W Hoffmann, P. Pile, G. D. Westfall, P. V. Shanmuganathan, D. P. Mahapatra, Yu-Gang Ma, T. D. S. Stanislaus, Anju Bhasin, X. L. Wang, C. Zhong, E. C. Aschenauer, L. Eun, W. J. Llope, L. E. Dunkelberger, I. G. Alekseev, M. A. Lisa, J. K. Adkins, M. Wada, S. Margetis, A. Vossen, H. H. Wieman, I. Sakrejda, J. Takahashi, T. P. Burton, A. Ohlson, X. Dong, Anik Gupta, S. K. Pal, Justin Stevens, R. Fatemi, Y. Zawisza, K. Krueger, J. B. Zhang, D. D. Koetke, J. E. Draper, S. Ramachandran, R. S. Longacre, Xiangming Sun, A. A. Derevschikov, J. G. Cramer, F. Videbæk, G. Webb, S. B. Nurushev, Zhiming Li, L. C. Bland, A. Lebedev, Frank Jm Geurts, G. Wang, Jie Zhao, S. Horvat, J. A. Vanfossen, O. Eyser, X. Li, M. R. Girard, M. M. Mondal, Michal Sumbera, Jaroslav Bielcik, S. Fazio, J. Rusnak, Maksym Zyzak, M. Cherney, Xiaofeng Zhu, A. F. Kraishan, S. Bültmann, Y. Yang, L. Yi, J. L. Zhang, S. W. Wissink, I. Koralt, G. Igo, Sukalyan Chattopadhyay, J. C. Webb, A. K. Bhati, O. V. Rogachevskiy, H. J. Jang, D. Keane, K. S. Engle, J. Novak, L. Ruan, Hua Pei, N. Yu, E. W. Oldag, Kejun Kang, L. V. Nogach, A. M. Poskanzer, Y. Zhang, Nilay Shah, Nikola Poljak, B. Sharma, J. Bouchet, Z. J. Sun, Amitava Roy, A. Ogawa, H. Z. Huang, K. D. Landry, K. Kauder, Sumit R. Das, J. H. Thomas, Nikolai Smirnov, Jian Deng, R. Stock, N. K. Pruthi, T. J. Humanic, Y. Guo, S. Vokal, G. Van Nieuwenhuizen, S. K. Gupta, Giacomo Contin, Z. Ye, Jorn Henning Putschke, H. F. Chen, S. H. Zhang, A. V. Brandin, J. Butterworth, Jongmin Lee, Haiyan Wang, L. G. Efimov, C-Q. Li, G. Agakishiev, D. S. Gunarathne, R. P. Scharenberg, Christina Markert, Nihar Sahoo, X. Huang, A. Kechechyan, B. Haag, K. Xin, T. Pawlak, C. K. Riley, D. Smirnov, Jana Bielcikova, O. Rusnakova, Bernd Surrow, R. L. Ray, P. Huck, H. S. Matis, D. Cebra, Pradip Kumar Sahu, I. K. Yoo, Wenbin Yan, T. K. Nayak, Zebo Tang, Q. H. Xu, R. Varma, O. D. Tsai, S. G. Brovko, Zhigang Xiao, J. H. Chen, S. S. Shi, Anthony Robert Timmins, W. Zha, P. Sorensen, W. W. Jacobs, Adam Ryszard Kisiel, Y. Xu, Janusz Chwastowski, R. Haque, J. Lauret, Leo Clifford Greiner, M. Lomnitz, A. Kesich, W. B. Schmidke, B. S. Page, Y. Fisyak, A. Sarkar, R. Lednicky, C. A. Gagliardi, H. J. Crawford, D. P. Kikola, J. Xu, P. Chaloupka, M. C. Cervantes, R. Cendejas, N. G. Minaev, C. E. Flores, E. G. Judd, T. Ljubicic, Wei Xie, T. Tarnowsky, P. Djawotho, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, M. Pachr, B. Stringfellow, K. Oh, L. Didenko, Z. J. Xu, D. A. Morozov, J. F. Ross, D. N. Svirida, S. Dhamija, G. S. Averichev, C. Perkins, W. Q. Shen, R. N. Singaraju, K. Yip, D. Tlusty, I. G. Bordyuzhin, Mirko Planinic, H. Caines, Sudhir Raniwala, A. Quintero, A. Aparin, Xiang Sun, P. Seyboth, J. S. Wang, R. R. Debbe, J. Alford, Z. Chang, Li-Yi Chen, D. Garand, W. Guryn, M. Vandenbroucke, S. Trentalange, G. M.S. Vasconcelos, Leszek Adamczyk, R. Derradi de Souza, Xiaofeng Luo, Guo-Liang Ma, A. Chikanian, Sevil Salur, Y. Wang, E. P. Sichtermann, J. Fedorisin, I. Kulakov, F. Ding, Z. P. Zhang, A. S. Hirsch, Y. Pandit, M. A. Szelezniak, Y. Panebratsev, D. Grosnick, H. M. Spinka, P. Kravtsov, A. M. Schmah, D. G. Underwood, Rashmi Raniwala, E. Sangaline, N. Schmitz, D. Arkhipkin, A. Hamed, E. Shahaliev, A. Banerjee, J. Cheng, T. J. M. Symons, L. C. De Silva, J. Porter, Ivan Kisel, Stephen V. Gliske, T. Ullrich, Y. F. Wu, Xiangyuan Cui, W. Christie, C. M. Du, B. Pawlik, H. S. Xu, A. Gibson, Basanta Kumar Nandi, J. L. Romero, E. Finch, Andrey Vasiliev, V. A. Okorokov, H. G. Ritter, Janet Elizabeth Seger, R. Vertesi, D. Solanki, F. Liu, Mariusz Przybycien, M. J. Skoby, R. D. Majka, W. Borowski, J. Schambach, M. Calderon De La Barca Sanchez, J. C. Dunlop, Zubayer Ahammed, M. J. LeVine, J. W. Harris, Q. Y. Shou, J. L. Drachenberg, Olga Evdokimov, Barbara Antonina Trzeciak, P. Yepes, A. Davila Leyva, A. H. Tang, Jay Roberts, I. Bunzarov, H. W. Ke, B. Di Ruzza, Lokesh Kumar, Nasim, R. Witt, S. Mioduszewski, Donald M. McDonald, Prithwish Tribedy, B. K. Srivastava, D. M.M.D. Madagodagettige Don, D. R. Gangadharan, Z. H. Khan, J. Engelage, G. Nigmatkulov, J. M. Landgraf, M. Strikhanov, J. Konzer, J. Sandweiss, and T. S. McShane

Subjects
Quark, Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, 01 natural sciences, Hadronization, Charm quark, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, QCD matter, Boson
Abstract

We report the first measurement of charmed-hadron (D-0) production via the hadronic decay channel (D-0 -> K- + pi(+)) in Au + Au collisions at root(NN)-N-s = 200 GeV with the STAR experiment. The charm production cross section per nucleon- nucleon collision at midrapidity scales with the number of binary collisions, N-bin, from p + p to central Au + Au collisions. The D-0 meson yields in central Au + Au collisions are strongly suppressed compared to those in p + p scaled by N-bin, for transverse momenta p(T) > 3 GeV/c, demonstrating significant energy loss of charm quarks in the hot and dense medium. An enhancement at intermediate p(T) is also observed. Model calculations including strong charm-medium interactions and coalescence hadronization describe our measurements.

Published
2014
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45. Beam Energy Dependence of Moments of the Net-Charge Multiplicity Distributions inAu+AuCollisions at RHIC

Author

Xiangyuan Cui, W. Christie, D. G. Underwood, J. H. Thomas, U. G. Desouza, Andrey Vasiliev, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, Janet Elizabeth Seger, C. Zhong, Xiaofeng Luo, J. Cheng, T. J. M. Symons, C. D. Anson, L. C. De Silva, Guo-Liang Ma, G. S. Averichev, N. R. Sahoo, Z. P. Zhang, A. S. Hirsch, Bedangadas Mohanty, G. Wang, P. Kravtsov, A. M. Schmah, J. Turnau, Wenbin Yan, W. J. Llope, Thorsten Sven Kollegger, J. G. Cramer, Z. Chang, Li-Yi Chen, J. Alford, Zhigang Xiao, David Jonathan Hofman, T. G. Dedovich, Z. J. Sun, M. J.M. Codrington, H. Masui, D. Kalinkin, W. Guryn, A. V. Brandin, T. P. Burton, M. Wada, Nasim, A. K. Bhati, S. Heppelmann, N. G. Minaev, B. Haag, G. Eppley, D. Keane, Anik Gupta, Y. Zawisza, Zebo Tang, Janusz Chwastowski, S. Dhamija, C. Perkins, Frank Jm Geurts, A. Ohlson, Nikolai Smirnov, H. M. Spinka, R. S. Longacre, K. Xin, J. Fedorisin, Marcelo Gameiro Munhoz, Radoslaw Antoni Kycia, L. G. Efimov, L. Eun, A. Banerjee, J. Takahashi, S. B. Nurushev, L. Kotchenda, R. A.N. Oliveira, T. K. Nayak, C. K. Riley, R. Vertesi, J. B. Zhang, D. D. Koetke, J. Pluta, I. G. Alekseev, Donika Plyku, M. A. Lisa, O. D. Tsai, J. E. Draper, W. Li, F. Videbæk, A. Roy, X. Li, B. Huang, I. K. Yoo, F. Liu, G. Webb, J. Porter, Bernd Surrow, Ivan Kisel, Mariusz Przybycien, S. Ramachandran, G. Igo, J. Novak, A. Kesich, R. Cendejas, R. Haque, Y. Guo, D. Tlusty, Y. Fisyak, M. C. Cervantes, J. Rusnak, L. Ruan, M. M. Mondal, Lokesh Kumar, B. Sharma, J. Bouchet, K. Oh, W. Q. Shen, C. E. Flores, E. G. Judd, I. G. Bordyuzhin, Mirko Planinic, K. D. Landry, K. Kauder, J. Butterworth, Jongmin Lee, R. L. Ray, Jie Zhao, S. Horvat, Xiang Sun, A. M. Poskanzer, Z. Ye, D. Garand, Rene Bellwied, Y. H. Zhu, L. M. Lima, R. E. Tribble, Gerald W Hoffmann, Sukalyan Chattopadhyay, P. Seyboth, R. Corliss, D. M.M.D. Madagodagettige Don, D. R. Gangadharan, A. Szanto de Toledo, T. Pawlak, M. Shao, Y. X. Pan, G. Van Buren, M. K. Mustafa, Xuan Zhang, Hanna Paulina Zbroszczyk, H. Z. Huang, S. Vokal, N. Xu, P. Filip, I. Koralt, Kejun Kang, L. V. Nogach, P. Pile, G. D. Westfall, Sumit R. Das, G. Van Nieuwenhuizen, Jun Deng, Y. Li, Alexandre Alarcon Do Passo Suaide, D. P. Mahapatra, D. R. Beavis, F. Zhao, A. Kechechyan, Pradip Kumar Sahu, Leszek Adamczyk, R. Derradi de Souza, J. M. Nelson, Jing-Han Chen, I. Kulakov, S. Fazio, W. Peryt, R. D. Majka, W. Borowski, J. Schambach, R. N. Singaraju, Anju Bhasin, A. Peterson, A. Lebedev, O. Hajkova, Sevil Salur, Y. Wang, Wolfgang Korsch, Xiaofeng Zhu, A. Ogawa, Y. Xu, P. Chaloupka, S. S. Shi, D. A. Morozov, Z. H. Khan, J. W. Harris, P. Yepes, A. Davila Leyva, A. H. Tang, Z. Barnovska, W. B. Schmidke, C. A. Gagliardi, Michal Sumbera, M. Pachr, S. Bültmann, Jaroslav Bielcik, S. W. Wissink, G. Agakishiev, D. Cebra, W. Zha, A. Sarkar, S. Trentalange, Xiangming Sun, B. Pawlik, A. Gibson, O. V. Rogachevskiy, H. J. Jang, N. K. Pruthi, D. Solanki, M. J. Skoby, T. Ljubicic, H. Caines, Sudhir Raniwala, A. Quintero, M. A.C. Lamont, L-X. Han, S. Y. Noh, Haiyan Wang, F. Ding, Basanta Kumar Nandi, I. Bunzarov, V. A. Okorokov, H. Qiu, M. Tokarev, Y. Zhang, J. Engelage, Nikola Poljak, P. R. Pujahari, H. F. Chen, L. C. Bland, X. L. Wang, Y. Panebratsev, Madan M. Aggarwal, D. Grosnick, Fuqiang Wang, A. Chikanian, C-Q. Li, R. Stock, R. P. Scharenberg, Christina Markert, J. C. Dunlop, A. Sandacz, S. Margetis, J. M. Landgraf, Yu-Gang Ma, T. D. S. Stanislaus, D. Smirnov, H. S. Matis, A. Vossen, X. Dong, S. K. Pal, E. Sangaline, D. Arkhipkin, A. Hamed, S. G. Brovko, Chi Yang, Justin Stevens, M. Strikhanov, H. H. Wieman, W. W. Jacobs, E. P. Sichtermann, J. Lauret, J. Konzer, D. N. Svirida, Zubayer Ahammed, R. Lednicky, M. J. LeVine, J. Balewski, T. Tarnowsky, Rashmi Raniwala, J. Sandweiss, P. Djawotho, J. F. Ross, T. Ullrich, Stephen V. Gliske, C. M. Du, H. S. Xu, H. G. Ritter, Shaobo Zhang, K. Yip, J. S. Wang, R. R. Debbe, Q. Y. Shou, I. Sakrejda, Y. Yang, L. Yi, Nilay Shah, R. Witt, J. K. Adkins, R. Fatemi, K. Krueger, S. Mioduszewski, Jana Bielcikova, J. A. Vanfossen, P. Sorensen, Donald M. McDonald, M. Cherney, K. S. Engle, Prithwish Tribedy, B. K. Srivastava, Hua Pei, L. Didenko, J. L. Drachenberg, S. K. Gupta, Olga Evdokimov, Barbara Antonina Trzeciak, P. Huck, Anthony Robert Timmins, Jay Roberts, Adam Ryszard Kisiel, E. C. Aschenauer, H. J. Crawford, William Axel Leight, P. V. Shanmuganathan, H. W. Ke, B. Di Ruzza, L. E. Dunkelberger, A. A. Derevschikov, Zhiming Li, Qinghua Xu, Maksym Zyzak, N. Schmitz, J. C. Webb, M. R. Girard, Wei Xie, E. W. Oldag, T. S. McShane, P. Bhattarai, A. Aparin, G. M.S. Vasconcelos, Matthew Walker, Y. J. Sun, C. Dilks, S. Kabana, Y. P. Viyogi, Y. Pandit, T. J. Humanic, R. Varma, E. Shahaliev, James Prewitt Hays-Wehle, B. S. Page, D. P. Kikola, B. Stringfellow, Y. F. Wu, Zhongbin Xu, J. L. Romero, E. Finch, and M. Calderon De La Barca Sanchez

Subjects
Physics, Quantum chromodynamics, Particle physics, Negative binomial distribution, General Physics and Astronomy, Sigma, Multiplicity (mathematics), Poisson distribution, Nuclear physics, symbols.namesake, Critical point (thermodynamics), Quark–gluon plasma, symbols, Kurtosis, Nuclear Experiment
Abstract

We report the first measurements of the moments-mean (M), variance (sigma(2)), skewness (S), and kurtosis (kappa)-of the net-charge multiplicity distributions at midrapidity in Au + Au collisions at seven energies, ranging from root s(NN) = 7.7 to 200 GeV, as a part of the Beam Energy Scan program at RHIC. The moments are related to the thermodynamic susceptibilities of net charge, and are sensitive to the location of the QCD critical point. We compare the products of the moments, sigma(2)/M, S sigma, and kappa sigma(2), with the expectations from Poisson and negative binomial distributions (NBDs). The S sigma values deviate from the Poisson baseline and are close to the NBD baseline, while the kappa sigma(2) values tend to lie between the two. Within the present uncertainties, our data do not show nonmonotonic behavior as a function of collision energy. These measurements provide a valuable tool to extract the freeze-out parameters in heavy-ion collisions by comparing with theoretical models.

Published
2014
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46. J/ψproduction at lowpTin Au + Au and Cu + Cu collisions atsNN=200GeV with the STAR detector

Author

B. Pawlik, C. D. Anson, J. W. Harris, A. Gibson, J. L. Drachenberg, Olga Evdokimov, Barbara Antonina Trzeciak, Radoslaw Antoni Kycia, Thorsten Sven Kollegger, D. Kalinkin, D. L. Olvitt, Basanta Kumar Nandi, T. P. Burton, P. Yepes, A. Davila Leyva, Y. Xu, P. Chaloupka, Z. J. Xu, S. Trentalange, S. Heppelmann, Jongmin Lee, I. G. Alekseev, R. L. Ray, Bedangadas Mohanty, A. Chikanian, T. S. McShane, P. Bhattarai, Madan M. Aggarwal, A. H. Tang, R. Vertesi, M. A. Lisa, Chen Yang, Y. F. Wu, L. Eun, R. S. Longacre, E. Sangaline, D. Arkhipkin, A. Hamed, Jay Roberts, Fuqiang Wang, Z. Chang, Xiangming Sun, F. Liu, Miroslav Simko, C. K. Riley, Li-Yi Chen, T. Ljubicic, Mariusz Przybycien, J. B. Zhang, D. D. Koetke, J. E. Draper, J. Engelage, I. Bunzarov, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, J. Novak, C. B. Powell, H. W. Ke, K. Poniatowska, M. Wada, M. Shao, Y. X. Pan, G. Van Buren, B. Haag, H. Caines, Sudhir Raniwala, S. Ramachandran, A. Quintero, G. Nigmatkulov, O. Eyser, J. Alford, W. Guryn, A. Vossen, N. Xu, S. K. Gupta, M. M. Mondal, P. Filip, I. Sakrejda, B. Di Ruzza, J. M. Landgraf, M. A.C. Lamont, L-X. Han, Y. Fisyak, S. Y. Noh, P. Pile, H. M. Spinka, G. D. Westfall, R. D. Majka, G. Igo, B. Sharma, Zebo Tang, L. Kotchenda, Y. J. Sun, H. Z. Huang, S. Vokal, J. Bouchet, F. Videbæk, G. Webb, Giacomo Contin, Nihar Sahoo, J. Fedorisin, Janusz Chwastowski, Michal Sumbera, W. Borowski, M. A. Szelezniak, K. Oh, Stephen V. Gliske, E. P. Sichtermann, N. K. Pruthi, J. L. Romero, J. Schambach, A. Banerjee, P. Huck, Lokesh Kumar, K. D. Landry, K. Kauder, H. Qiu, Leo Clifford Greiner, Vitaly Okorokov, R. Witt, Xiangyuan Cui, W. Christie, S. Mioduszewski, C. Dilks, M. Strikhanov, J. Konzer, Rashmi Raniwala, Jie Zhao, S. Horvat, Sukalyan Chattopadhyay, J. Butterworth, G. Eppley, M. Tokarev, Yang Yang, Anthony Robert Timmins, S. Kabana, Bernd Surrow, A. K. Bhati, D. Keane, Y. P. Viyogi, P. V. Shanmuganathan, Xin-Yuan Huang, Nikolai Smirnov, J. H. Thomas, Adam Ryszard Kisiel, S. Bültmann, Andrey Vasiliev, J. Sandweiss, P. Seyboth, Nasim, J. H. Chen, S. S. Shi, T. Pawlak, L. E. Dunkelberger, Donald M. McDonald, R. Stock, H. J. Crawford, C. Perkins, J. Pluta, M. K. Mustafa, Prithwish Tribedy, B. K. Srivastava, W. Zha, J. M. Nelson, Wei Xie, T. Ullrich, J. K. Adkins, L. G. Efimov, W. Li, Y. Li, A. A. Derevschikov, R. Fatemi, A. Aparin, G. M.S. Vasconcelos, S. W. Wissink, Q. H. Xu, A. Sarkar, J. G. Cramer, M. Calderon De La Barca Sanchez, D. A. Morozov, Leszek Adamczyk, L. Yi, H. G. Ritter, B. Huang, K. Krueger, Zhiming Li, Y. Zhang, Y. Pandit, D. P. Mahapatra, R. Derradi de Souza, T. K. Nayak, J. Xu, Rene Bellwied, J. A. Vanfossen, I. Koralt, N. Schmitz, Maksym Zyzak, N. Yu, W. B. Schmidke, S. Fazio, Kejun Kang, L. V. Nogach, Janet Elizabeth Seger, Yinina Ma, M. Lomnitz, E. Shahaliev, Y. H. Zhu, Nikola Poljak, T. D. S. Stanislaus, M. R. Girard, Wenbin Yan, C. A. Gagliardi, R. E. Tribble, Jian Deng, I. Kulakov, Anik Gupta, D. G. Underwood, J. C. Dunlop, Nilay Shah, Sumit R. Das, C. M. Du, Xuan Zhang, J. C. Webb, G. Van Nieuwenhuizen, Anju Bhasin, F. Ding, Zhigang Xiao, Yicheng Guo, G. Agakishiev, D. S. Gunarathne, Xiaofeng Luo, M. Cherney, H. S. Xu, K. S. Engle, Y. Panebratsev, Jorn Henning Putschke, Gerald W Hoffmann, D. R. Gangadharan, Zubayer Ahammed, Guo-Liang Ma, Xiaofeng Zhu, Hua Pei, E. W. Oldag, D. Grosnick, A. V. Brandin, Frank Jm Geurts, A. Lebedev, H. H. Wieman, T. J. Humanic, Jaroslav Bielcik, N. G. Minaev, Z. H. Khan, D. Cebra, K. Xin, Z. P. Zhang, Haiyan Wang, X. Li, Q. Y. Shou, G. Wang, A. S. Hirsch, P. Kravtsov, Jana Bielcikova, A. M. Schmah, Hanna Paulina Zbroszczyk, J. L. Zhang, R. Varma, J. Cheng, X. L. Wang, I. K. Yoo, B. S. Page, J. Rusnak, D. P. Kikola, A. F. Kraishan, T. J. M. Symons, C. Zhong, E. C. Aschenauer, S. Margetis, P. Sorensen, A. Kesich, B. Stringfellow, G. S. Averichev, O. V. Rogachevskiy, H. J. Jang, L. Ruan, A. Ogawa, L. C. De Silva, H. F. Chen, S. H. Zhang, R. Cendejas, R. Haque, X. Dong, Z. J. Sun, David Jonathan Hofman, D. R. Beavis, J. M. Campbell, J. Turnau, M. J.M. Codrington, H. Masui, O. D. Tsai, Amitava Roy, Justin Stevens, J. Porter, C. E. Flores, E. G. Judd, K. Yip, M. C. Cervantes, Ivan Kisel, J. S. Wang, D. Tlusty, I. G. Bordyuzhin, W. Q. Shen, L. Didenko, D. Solanki, R. R. Debbe, M. Vandenbroucke, A. M. Poskanzer, Z. Ye, T. G. Dedovich, Xiang Sun, J. Takahashi, Mirko Planinic, F. Zhao, S. B. Nurushev, D. Garand, W. J. Llope, Sevil Salur, Y. Wang, A. Kechechyan, M. J. Skoby, Pradip Kumar Sahu, A. Ohlson, L. C. Bland, C-Q. Li, R. P. Scharenberg, Christina Markert, S. G. Brovko, D. Smirnov, O. Rusnakova, H. S. Matis, D. N. Svirida, L. K. Kosarzewski, W. W. Jacobs, J. Lauret, R. Lednicky, T. Tarnowsky, P. Djawotho, and J. F. Ross

Subjects
Physics, Nuclear and High Energy Physics, chemistry.chemical_element, Modification factor, 7. Clean energy, Copper, Particle identification, Nuclear physics, chemistry, Transverse momentum, Quark–gluon plasma, Atomic physics, Relativistic Heavy Ion Collider, Hydrodynamic flow, STAR detector
Abstract

The J/ψ pT spectrum and nuclear modification factor (RAA) are reported for pT

Published
2014
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47. Dielectron Mass Spectra fromAu+AuCollisions atsNN=200 GeV

Author

Z. Barnovska, Nasim, Michal Sumbera, S. Bültmann, Wenbin Yan, S. W. Wissink, I. Sakrejda, Stephen V. Gliske, Zhigang Xiao, Jie Zhao, S. Horvat, A. Szanto de Toledo, Nikola Poljak, J. G. Cramer, H. Qiu, M. Tokarev, N. G. Minaev, I. Koralt, T. Pawlak, M. R. Girard, B. Pawlik, Wolfgang Korsch, Y. Yang, L. Yi, W. Zha, D. M.M.D. Madagodagettige Don, C. D. Anson, H. G. Ritter, D. R. Gangadharan, A. Sarkar, T. D. S. Stanislaus, J. L. Drachenberg, A. Gibson, Anju Bhasin, Kejun Kang, L. V. Nogach, Sumit R. Das, I. K. Yoo, R. Haque, Xiaofeng Zhu, E. W. Oldag, C. E. Flores, E. G. Judd, Nilay Shah, H. H. Wieman, Bedangadas Mohanty, N. Xu, P. Filip, Olga Evdokimov, Barbara Antonina Trzeciak, Basanta Kumar Nandi, A. Lebedev, David Jonathan Hofman, M. J.M. Codrington, H. Masui, G. Van Nieuwenhuizen, S. K. Gupta, B. Haag, R. S. Longacre, A. Ogawa, H. F. Chen, Xiaofeng Luo, X. L. Wang, C. Zhong, E. C. Aschenauer, S. Margetis, V. A. Okorokov, P. Huck, F. Ding, Y. Panebratsev, Zebo Tang, Janusz Chwastowski, K. Yip, Z. H. Khan, M. Wada, L. C. Bland, P. Pile, G. D. Westfall, Jay Roberts, T. J. Humanic, A. M. Poskanzer, Z. Ye, J. W. Harris, Guo-Liang Ma, D. G. Underwood, Z. P. Zhang, Xiangming Sun, R. A.N. Oliveira, X. Huang, S. Dhamija, J. S. Wang, R. R. Debbe, C. Perkins, Y. F. Wu, A. Chikanian, A. Sandacz, S. G. Brovko, Chi Yang, Anthony Robert Timmins, A. S. Hirsch, A. Kechechyan, P. Kravtsov, A. M. Schmah, D. Grosnick, X. Dong, S. K. Pal, Justin Stevens, C. K. Riley, Adam Ryszard Kisiel, H. W. Ke, J. Takahashi, R. Varma, S. B. Nurushev, Pradip Kumar Sahu, G. Igo, J. Novak, B. Sharma, L. Kotchenda, B. Di Ruzza, J. L. Zhang, H. J. Crawford, D. N. Svirida, A. Roy, X. Li, E. Sangaline, D. Arkhipkin, B. S. Page, D. P. Kikola, S. Fazio, J. Cheng, J. Engelage, T. J. M. Symons, L. C. De Silva, J. Bouchet, Anik Gupta, K. D. Landry, K. Kauder, Y. Zawisza, F. Videbæk, A. V. Brandin, A. Hamed, J. Rusnak, G. Webb, B. Stringfellow, T. S. McShane, P. Bhattarai, Sukalyan Chattopadhyay, Y. Guo, J. K. Adkins, Jongmin Lee, R. L. Ray, J. Butterworth, K. Xin, Frank Jm Geurts, R. Fatemi, Y. Fisyak, T. P. Burton, L. Ruan, R. Witt, K. Krueger, Xiangyuan Cui, W. Christie, P. Yepes, A. Davila Leyva, Jian Deng, J. Alford, S. Mioduszewski, J. M. Landgraf, K. Oh, P. R. Pujahari, P. V. Shanmuganathan, A. Kesich, Yifei Zhang, R. Cendejas, N. K. Pruthi, D. Tlusty, T. Ljubicic, I. G. Bordyuzhin, Mirko Planinic, Haiyan Wang, J. A. Vanfossen, Z. Chang, A. H. Tang, Donald M. McDonald, Y. J. Sun, W. Guryn, H. Caines, Sudhir Raniwala, Andrey Vasiliev, J. Turnau, Prithwish Tribedy, B. K. Srivastava, M. Strikhanov, S. H. Zhang, M. K. Mustafa, G. Agakishiev, Y. Xu, D. Solanki, C. Dilks, P. Chaloupka, A. Quintero, Li-Yi Chen, G. Eppley, S. Kabana, Y. P. Viyogi, J. Fedorisin, J. Konzer, D. Cebra, T. G. Dedovich, R. N. Singaraju, Janet Elizabeth Seger, L. E. Dunkelberger, Y. Li, G. Wang, S. Trentalange, I. Bunzarov, M. Cherney, K. S. Engle, Hua Pei, M. Shao, Y. X. Pan, G. Van Buren, J. C. Dunlop, Zubayer Ahammed, J. Pluta, J. Sandweiss, Alexandre Alarcon Do Passo Suaide, R. Vertesi, M. J. Skoby, W. Li, O. Hajkova, E. P. Sichtermann, Bernd Surrow, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, M. J. LeVine, F. Liu, B. Huang, Mariusz Przybycien, D. P. Mahapatra, Z. J. Sun, Rene Bellwied, Rashmi Raniwala, J. M. Nelson, Q. Y. Shou, Y. H. Zhu, Zhongbin Xu, L. M. Lima, R. E. Tribble, W. Peryt, A. A. Derevschikov, T. Ullrich, R. D. Majka, P. Seyboth, C-Q. Li, Gerald W Hoffmann, J. L. Romero, R. P. Scharenberg, Christina Markert, W. Borowski, C. M. Du, J. Schambach, N. R. Sahoo, Leszek Adamczyk, R. Derradi de Souza, H. S. Xu, Jana Bielcikova, I. Kulakov, E. Finch, P. Sorensen, A. K. Bhati, D. Keane, D. Smirnov, H. S. Matis, Lokesh Kumar, Wei Xie, A. Aparin, G. M.S. Vasconcelos, Y. Pandit, N. Schmitz, L. Didenko, E. Shahaliev, Zhiming Li, Qinghua Xu, Maksym Zyzak, Nikolai Smirnov, R. Stock, Marcelo Gameiro Munhoz, J. C. Webb, Radoslaw Antoni Kycia, W. W. Jacobs, J. Lauret, I. G. Alekseev, L. G. Efimov, T. K. Nayak, Donika Plyku, R. Lednicky, M. Calderon De La Barca Sanchez, M. A. Lisa, T. Tarnowsky, P. Djawotho, J. F. Ross, O. D. Tsai, W. B. Schmidke, M. C. Cervantes, W. Q. Shen, Xiang Sun, D. Garand, C. A. Gagliardi, Sevil Salur, Y. Wang, H. M. Spinka, A. Banerjee, M. Pachr, J. H. Thomas, H. Z. Huang, S. Vokal, U. G. Desouza, Jaroslav Bielcik, O. V. Rogachevskiy, H. J. Jang, Madan M. Aggarwal, Fuqiang Wang, J. H. Chen, S. S. Shi, G. S. Averichev, A. Vossen, J. Porter, Ivan Kisel, D. A. Morozov, Thorsten Sven Kollegger, D. Kalinkin, S. Heppelmann, L. Eun, J. B. Zhang, D. D. Koetke, J. E. Draper, S. Ramachandran, M. M. Mondal, W. J. Llope, A. Ohlson, Xuan Zhang, Hanna Paulina Zbroszczyk, D. R. Beavis, F. Zhao, M. A.C. Lamont, L-X. Han, S. Y. Noh, and Yu-Gang Ma

Subjects
Quantum chromodynamics, Physics, Particle physics, Meson, Hadron, General Physics and Astronomy, Super Proton Synchrotron, Nuclear physics, Yield (chemistry), Quark–gluon plasma, Mass spectrum, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment
Abstract

We report the STAR measurements of dielectron (e(+)e(-)) production at midrapidity (|y(ee)

Published
2014
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48. GenEx: A simple generator structure for exclusive processes in high energy collisions

Author

Janusz Chwastowski, Rafal Staszewski, J. Turnau, and Radoslaw Antoni Kycia

Subjects
Physics, Particle physics, Generator (computer programming), Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, Monte Carlo method, Structure (category theory), FOS: Physical sciences, 01 natural sciences, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Simple (abstract algebra), Phase space, 0103 physical sciences, Production (computer science), 010306 general physics, Nuclear Experiment, Event generator
Abstract

A simple C++ class structure for construction of a Monte Carlo event generators which can produce unweighted events within relativistic phase space is presented. The generator is self-adapting to the provided matrix element and acceptance cuts. The program is designed specially for exclusive processes and includes, as an example of such an application, implementation of the model for exclusive production of meson pairs $pp \rightarrow p M^+M^- p $ in high energy proton-proton collisions., Comment: 28 pages, 6 figures

Published
2014
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49. Fluctuations of charge separation perpendicular to the event plane and local parity violation insNN=200GeV Au + Au collisions at the BNL Relativistic Heavy Ion Collider

Author

P. Seyboth, H. Bichsel, Leszek Adamczyk, R. Derradi de Souza, G. Odyniec, R. A.N. Oliveira, C. K. Riley, Y. Fisyak, K. Oh, T. S. McShane, Y. Zoulkarneeva, P. Bhattarai, Sergey Voloshin, Z. J. Sun, Amitava Roy, Y. F. Wu, X. L. Wang, C. Zhong, Q. Wang, E. C. Aschenauer, N. R. Sahoo, T. R. Schuster, O. D. Tsai, T. P. Burton, H. Z. Huang, S. Vokal, S. Margetis, M. Elnimr, M. C. Cervantes, W. Q. Shen, K. Yip, X. Dong, C. D. Anson, L. Kotchenda, Matthew Walker, Madan M. Aggarwal, J. Engelage, J. Porter, S. K. Pal, Justin Stevens, J. W. Harris, Anik Gupta, W. J. Llope, L. C. Bland, J. S. Wang, P. R. Pujahari, C. B. Powell, Jongmin Lee, D. Garand, A. Dion, Y. J. Sun, Sevil Salur, Y. Wang, R. L. Ray, J. Alford, R. Vertesi, J. L. Romero, R. R. Debbe, Y. Zawisza, Fuqiang Wang, Frank Jm Geurts, Jian Deng, D. Tlusty, C. Dilks, Y. Xu, J. Kiryluk, J. H. Chen, Xiaofeng Luo, P. Chaloupka, L. H. Tarini, Z. J. Xu, G. Agakishiev, T. Ljubicic, I. Koralt, Bedangadas Mohanty, R. S. Longacre, I. G. Bordyuzhin, Mirko Planinic, G. Eppley, W. Guryn, D. Cebra, A. Sandacz, H. Caines, Sudhir Raniwala, E. Finch, S. Trentalange, J. K. Adkins, S. Kabana, A. K. Bhati, D. Keane, Y. P. Viyogi, N. Xu, P. Filip, A. Ohlson, F. Liu, Nikolai Smirnov, R. Fatemi, Michael Joseph Betancourt, R. Stock, A. Chikanian, R. Haque, J. M. Landgraf, Guo-Liang Ma, E. P. Sichtermann, Kejun Kang, L. V. Nogach, Mariusz Przybycien, Sumit R. Das, O. G. Grebenyuk, L. G. Efimov, S. G. Brovko, Chi Yang, A. M. Poskanzer, J. Balewski, Rashmi Raniwala, T. K. Nayak, Claude Andre Pruneau, P. Yepes, A. Davila Leyva, M. Strikhanov, Thorsten Sven Kollegger, F. Ding, J. Konzer, G. Van Nieuwenhuizen, J. Fedorisin, K. Krueger, P. Chung, E. Sangaline, D. Arkhipkin, A. Hamed, J. G. Cramer, M. C. Suarez, P. Pile, G. D. Westfall, Y. Panebratsev, D. Grosnick, O. Hajkova, D. N. Svirida, T. Ullrich, S. Heppelmann, A. Kechechyan, Marcelo Gameiro Munhoz, R. G. Fersch, M. A.C. Lamont, J. Pluta, Wei Xie, S. H. Zhang, Z. P. Zhang, L-X. Han, B. Haag, M. K. Mustafa, Y. Li, J. A. Vanfossen, Pradip Kumar Sahu, L. Eun, A. S. Hirsch, A. H. Tang, J. Sandweiss, R. D. Majka, P. Kravtsov, A. Aparin, C. M. Du, H. S. Xu, Radoslaw Antoni Kycia, Alexandre Alarcon Do Passo Suaide, W. Li, Nasim, D. P. Mahapatra, I. G. Alekseev, Donika Plyku, M. A. Lisa, M. Wada, I. Bunzarov, G. M.S. Vasconcelos, C-Q. Li, Y. Pandit, Jana Bielcikova, Z. Chang, Li-Yi Chen, G. Igo, J. Novak, B. Sharma, B. Pawlik, J. Bouchet, J. B. Zhang, B. Huang, A. M. Schmah, Jie Zhao, Yu-Gang Ma, S. Horvat, A. Szanto de Toledo, N. Schmitz, D. Solanki, Zebo Tang, Janusz Chwastowski, K. D. Landry, A. Vossen, K. Kauder, H. Qiu, M. Tokarev, D. D. Koetke, J. E. Draper, S. Ramachandran, E. W. Oldag, J. Y. Chen, W. Borowski, J. Schambach, M. M. Mondal, David Jonathan Hofman, E. Shahaliev, P. Sorensen, B. Schmidke, J. Butterworth, Rene Bellwied, M. J.M. Codrington, H. Masui, R. P. Scharenberg, Christina Markert, D. Smirnov, H. S. Matis, M. Naglis, A. Gibson, Anju Bhasin, Xuan Zhang, I. Sakrejda, D. M.M.D. Madagodagettige Don, D. R. Gangadharan, Basanta Kumar Nandi, M. Cherney, K. S. Engle, Lokesh Kumar, Hua Pei, Y. Yang, S. Dhamija, L. Yi, M. K. Mitrovski, Z. Barnovska, C. Perkins, S. LaPointe, T. Pawlak, H. M. Spinka, Y. H. Zhu, I. Kisel, M. J. Skoby, T. J. Humanic, Hanna Paulina Zbroszczyk, L. M. Lima, R. E. Tribble, Y. Mohammed, W. W. Jacobs, A. Banerjee, Michal Sumbera, D. R. Beavis, Nilay Shah, J. Turnau, W. Zha, T. D. S. Stanislaus, Jorn Henning Putschke, Q. H. Xu, A. Sarkar, J. H. Thomas, V. A. Okorokov, H. H. Wieman, S. Bültmann, U. G. Desouza, J. Lauret, A. V. Brandin, Russell Richard Betts, T. G. Dedovich, Zhigang Xiao, Yicheng Guo, R. Varma, M. Sharma, F. Zhao, Jaroslav Bielcik, James Prewitt Hays-Wehle, B. S. Page, D. G. Underwood, S. K. Gupta, Gerald W Hoffmann, A. Lebedev, S. W. Wissink, L. Didenko, Y. Zhang, K. Xin, R. Lednicky, D. P. Kikola, Nikola Poljak, J. Cheng, T. J. M. Symons, B. Stringfellow, L. C. De Silva, Elena Bruna, J. Takahashi, X. Li, Zhiming Li, T. Tarnowsky, P. Djawotho, R. N. Singaraju, J. Rusnak, G. S. Averichev, O. V. Rogachevskiy, P. Huck, M. Calderon De La Barca Sanchez, A. Kesich, F. Videbæk, L. Ruan, G. Webb, J. F. Ross, R. Cendejas, I. K. Yoo, Xiangming Sun, R. Corliss, W. Yan, Sukalyan Chattopadhyay, M. Shao, Y. X. Pan, G. Van Buren, Anthony Robert Timmins, J. C. Webb, Adam Ryszard Kisiel, C. E. Flores, E. G. Judd, S. S. Shi, Chitrasen Jena, H. J. Crawford, W. Xu, M. Zyzak, Bernd Surrow, Wolfgang Korsch, J. M. Nelson, Xiaofeng Zhu, W. Peryt, S. Fazio, A. Ogawa, H. F. Chen, C. A. Gagliardi, I. Kulakov, M. Pachr, N. K. Pruthi, William Axel Leight, Haiyan Wang, L. E. Dunkelberger, D. L. Olson, Xiangyuan Cui, W. Christie, Janet Elizabeth Seger, Stephen V. Gliske, H. G. Ritter, J. L. Drachenberg, Olga Evdokimov, Barbara Antonina Trzeciak, Jay Roberts, H. W. Ke, B. Di Ruzza, R. Witt, S. Mioduszewski, Donald M. McDonald, Prithwish Tribedy, B. K. Srivastava, J. C. Dunlop, Zubayer Ahammed, M. J. LeVine, Q. Y. Shou, and G. Wang

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Charge separation, Collective motion, Parity (physics), 01 natural sciences, Nuclear physics, 0103 physical sciences, Perpendicular, Momentum conservation, 010306 general physics, Relativistic Heavy Ion Collider, STAR detector
Abstract

Previous experimental results based on data (∼15×106 events) collected by the STAR detector at the BNL Relativistic Heavy Ion Collider suggest event-by-event charge-separation fluctuations perpendicular to the event plane in noncentral heavy-ion collisions. Here we present the correlator previously used split into its two component parts to reveal correlations parallel and perpendicular to the event plane. The results are from a high-statistics 200-GeV Au + Au collisions data set (57×106 events) collected by the STAR experiment. We explicitly count units of charge separation from which we find clear evidence for more charge-separation fluctuations perpendicular than parallel to the event plane. We also employ a modified correlator to study the possible P-even background in same- and opposite-charge correlations, and find that the P-even background may largely be explained by momentum conservation and collective motion. © 2013 American Physical Society.

Published
2013
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50. Feasibility Studies of Exclusive Diffractive Bremsstrahlung Measurement at RHIC Energies

Author

Janusz Chwastowski, Radoslaw Antoni Kycia, B. Pawlik, A. Cyz, J. Turnau, Rafal Sikora, and Ł. Fulek

Subjects
Physics, Nuclear physics, High Energy Physics - Experiment (hep-ex), Astrophysics::High Energy Astrophysical Phenomena, Bremsstrahlung, FOS: Physical sciences, General Physics and Astronomy, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract

Feasibility studies of an observation of the exclusive diffractive bremsstrahlung at RHIC at $\sqrt{s} = 200$~GeV and at $\sqrt{s} = 500$~GeV are reported. A simplified approach to the photon and the scattered proton energy reconstruction is used. Influence of possible backgrounds is discussed., Comment: 15 pages, 9 figures

Published
2015
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