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2,068 results on '"strangeness"'

12. Short-Lived Resonances as Probes of the Medium Produced in Heavy-Ion Collisions

Author

Victor Riabov

Subjects
Physics, short-lived hadronic resonances, hadronic phase, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, Phase (waves), Resonance, Strangeness production, heavy-ion collisions, Strangeness, 01 natural sciences, Nuclear physics, strangeness, Reaction dynamics, 0103 physical sciences, Computer Science::Programming Languages, lcsh:QC770-798, Heavy ion, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Nuclear Experiment, Event (particle physics)
Abstract

Hadronic resonances play an important role in the study of the physics of heavy-ion collisions. In these proceedings, we discuss how the resonances can probe the reaction dynamics, the strangeness production and the properties of the hadronic phase in heavy-ion collisions at center-of-mass energies of sNN = 4–11 GeV. The resonance properties predicted by the general-purpose event generators are found to be very sensitive to the properties and space-time evolution of the medium produced in heavy-ion collisions.

Published
2021

13. QCD phase transition studied by means of hadron production

Author

Michal Petran and Johann Rafelski

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, FOS: Physical sciences, Strangeness production, Strangeness, Hadronization, Nuclear physics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Quark–gluon plasma, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract

This is a brief review of our work describing the hadronization process of a QGP fireball formed in relativistic heavy-ion collisions. We introduce the SHARE method of analysis of hadron multiplicities. Using this tool we describe in consistent continuos manner the yield of all hadrons produced in the available range of reaction energies and centralities. The properties of the fireball final state can be understood by considering all primary hadronic particles. The dense hadron fireball created at SPS, RHIC, and LHC shows that the final state is differentiated solely by: i) volume changes; and ii) flavor (strangeness, charm) content. Conversely, emerging particles add up to create universal hadronization pressure $P = 80 \pm 3$ MeV/fm$^3$ for all considered collision systems. The relative strangeness to entropy content of a large fireball is found to be that of quark-gluon plasma degrees of freedom near the chemical QGP equilibrium. This 'Universal Hadronization' condition common to SPS, RHIC, and LHC agrees with the proposed reaction picture of a direct QGP fireball evaporation into free-streaming hadrons., 11 pages, many figures; Presented in Wroclaw at the February 2014 MB32-Symposium honoring Ludwik Turko

Published
2022

14. NICA: Theoretical Overview

Author

J. Cleymans

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Nuclotron, law, Phase space, Heavy ion, Strangeness, Nuclear Experiment, Collider, law.invention, Ion
Abstract

There are strong reasons to bleive that the energy region covered by the Nuclotron-based Ion Collider fAcility (NICA) is an extremely interesting one. We present an overview of theoretical proposals in relativistic heavy ion collisions and show where more and better measurements are needed. The theoretical understanding can be clarified by covering the energy region available to NICA. It would be helpful to determine the strangeness content by covering the full phase space ( $$4\pi $$ ) to determine the thermodynamic parameters.

Published
2021
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15. Hyperons from Bi + Bi Collisions at MPD-NICA: Preliminary Analysis of Production at Generation, Simulation and Reconstruction Level

Author

M. Rodríguez-Cahuantzi, Alejandro Ayala, Maria Elena Tejeda-Yeomans, Isabel Dominguez, Eleazar Cuautle, and Ivonne Maldonado

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Work (thermodynamics), Content (measure theory), Hyperon, Observable, Strangeness, Nuclear Experiment, Polarization (waves), Lambda, Bar (unit)
Abstract

An important observable to understand the properties of the matter produced in heavy-ion collisions is its strangeness content. Recent experimental results show that in semi-central collisions, the Λ and $$\bar {\Lambda }$$ global polarization show differences that increase at low energies. This behaviour has been described using a model where these particles may be produced from two distinct density zones in the collision region: the core and the corona where QGP processes and p + p like reactions, respectively, are mainly at work. Using this idea, the polarization can be influenced by the relative abundance of these particles coming from either regions. In this work we show how to test this model in the MPD experiment.

Published
2021
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19. STAR Results from Au+Au Fixed-Target Collisions at [formula omitted].

Author

Meehan, Kathryn

Subjects
*COLLISIONS (Physics), *HADRONS, *HEAVY ion collisions, *TARGET practice, *NUCLEAR physics
Abstract

We present results from STAR's first dedicated fixed-target run conducted in 2015 with Au + Au collisions at s NN = 4.5 GeV . Directed flow of protons and lambdas, elliptic flow of identified hadrons, HBT radii, as well as pion, K s 0 , and Λ spectra are compared with previous results from the AGS. These results demonstrate that STAR has good event reconstruction and particle identification capabilities in the fixed-target configuration. The implications of these results on future STAR fixed-target runs are discussed. [ABSTRACT FROM AUTHOR]

Published
2017
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20. Performance of the MPD Detector in the Study of the Strangeness to Entropy Ratio in Heavy-Ion Collisions at the NICA Accelerator Complex

Author

A.I. Zinchenko, A. Mudrokh, V. Kolesnikov, V. Kireyeu, and V. Vasendina

Subjects
Physics, Excitation function, Nuclear and High Energy Physics, Radiation, 010308 nuclear & particles physics, Detector, Strangeness production, Strangeness, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Baryon, 0103 physical sciences, Radiology, Nuclear Medicine and imaging, Heavy ion, Nuclear Experiment, 010306 general physics
Abstract

Strangeness production in heavy-ion collisions is one of the main goals of the scientific program at the NICA accelerator complex. The MPD detector is designed to study the properties of strongly interacting matter at extreme baryon densities. In this article, the MPD performance to measure the excitation function of the strangeness to entropy ratio in central Au + Au collisions is reported. The investigation has been performed at the Laboratory of High Energy Physics, JINR.

Published
2020
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21. Medium effects in proton-induced strangeness production.

Author

Lapidus, K.

Subjects
*PROTON spectra, *NUCLEAR reactions, *NUCLEAR physics, *KAONS, *NUCLEAR matter
Abstract

We discuss recent advances of the HADES collaboration in the sector of in-medium strangeness physics, in particular the measurement of neutral kaons produced in proton-niobium reactions at 3.5 GeV. [ABSTRACT FROM AUTHOR]

Published
2015
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23. Transport Model Approach to Λ and Λ¯ Polarization in Heavy-Ion Collisions

Author

O. V. Vitiuk, Evgeny Zabrodin, Kyrill A. Bugaev, and Larissa Bravina

Subjects
Physics, Physics and Astronomy (miscellaneous), General Mathematics, Hadron, Nuclear Theory, MathematicsofComputing_GENERAL, Hyperon, transport models, Vorticity, Strangeness, Nuclear matter, Polarization (waves), Ion, Nuclear physics, TheoryofComputation_MATHEMATICALLOGICANDFORMALLANGUAGES, Chemistry (miscellaneous), QA1-939, Computer Science (miscellaneous), polarization of hyperons, thermal vorticity, Symmetry breaking, Nuclear Experiment, Mathematics, relativistic heavy-ion collisions
Abstract

This paper investigates the symmetry breaking between the polarizations of Λ and Λ¯ hyperons in relativistic collisions of heavy ions at intermediate and low energies. The microscopic transport model UrQMD is employed to study the thermal vorticity of hot and dense nuclear matter formed in non-central Au + Au collisions at center-of-mass energies 7.7≤sNN≤62.4 GeV. The whole volume of an expanding fireball is subdivided into small cubic cells. Then, we trace the final Λ and Λ¯ hyperons back to their last interaction point within a certain cell. Extracting the bulk parameters, such as energy density, net baryon density, and net strangeness of the hot and dense medium in the cell, one can obtain the cell temperature and the chemical potentials at the time of the hyperon emission. To do this, the extracted characteristics have to be fitted to the statistical model (SM) of ideal hadron gas. After that, the vorticity of nuclear matter and polarization of both hyperons are calculated. We found that the polarization of both Λ and Λ¯ increases with decreasing energy of heavy-ion collisions. The stronger polarization of Λ¯ is explained by (i) the slightly different freeze-out conditions of both hyperons and (ii) the different space–time distributions of Λ and Λ¯.

Published
2021
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24. Double strangeness Ξ− production as a probe of nuclear equation of state at high densities

Author

Gao-Chan Yong, Yuan Gao, Zi-Wei Lin, and Zhigang Xiao

Subjects
Physics, Nuclear and High Energy Physics, Equation of state, Phase boundary, Nuclear Theory, QC1-999, Hadron, Strangeness, Nuclear matter, Deconfinement, Nuclear physics, Cascade, Nucleon, Nuclear Experiment
Abstract

Double strangeness $\Xi^{-}$ production in Au+Au collisions at 2, 4, and 6 GeV/nucleon incident beam energies is studied with the pure hadron cascade version of a multi-phase transport model. It is found that due to larger nuclear compression, the model with the soft equation of state (EoS) gives larger yields of both single strangeness ($K^{+}$ and $\Lambda+\Sigma^{0}$) and double strangeness $\Xi^{-}$. The sensitivity of the double strangeness $\Xi^{-}$ to the EoS is evidently larger than that of $K^{+}$ or $\Lambda+\Sigma^{0}$ since the phase-space distribution of produced $\Xi^{-}$ is more compact compared to those of the single strangeness. The larger sensitivity of the yields ratio of $\Xi^{-}$ to the EoS from heavy and light systems is kept compared to that of the single strangeness. The study of $\Xi^{-}$ production in relativistic heavy-ion collisions provides an alternative for the ongoing heavy-ion collision program at facilities worldwide for identifying the EoS at high densities, which is relevant to the investigation of the phase boundary and onset of deconfinement of dense nuclear matter., Comment: 5 pages, 5 figures, PLB, in production

Published
2021

25. Status and Perspectives of J-PARC

Author

Tomofumi Nagae

Subjects
Physics, Nuclear physics, Beamline, Nuclear Theory, Hadron, J-PARC, Strangeness, Nuclear Experiment, Atomic and Molecular Physics, and Optics
Abstract

In the Hadron Experimental Hall of J-PARC, several experiments on strangeness nuclear physics are in progress with producing new results. Construction of a new high-momentum beam line was completed in June, 2020. A new production target system was also installed, in the end of 2020, to improve the intensity of the $$K^-$$ beams delivered in the hall. It will be effective to conduct the strangeness-2 physics program. Some recent topics are introduced together with the status of on-going experiments. The hadron hall extension program in the future is also discussed briefly.

Published
2021
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26. Hyperon Dynamics in Heavy-ion Collisions near threshold energy

Author

Hui-Gan Cheng, Zhao-Qing Feng, and Ding-Chang Zhang

Subjects
Physics, Nuclear Theory, High Energy Physics::Phenomenology, Hyperon, FOS: Physical sciences, General Physics and Astronomy, Strangeness, Threshold energy, Kinetic energy, Nuclear Theory (nucl-th), Nuclear physics, Momentum, Isospin, Effective field theory, Nuclear Experiment, Energy (signal processing)
Abstract

Within the framework of quantum molecular dynamics transport model, the isospin and in-medium effects on the hyperon production in the reaction of $^{197}$Au + $^{197}$Au are investigated thoroughly. A repulsive hyperon-nucleon potential from the chiral effective field theory is implemented into the model, which is related to the hyperon momentum and baryon density. The correction on threshold energy of the elementary hyperon cross section is taken into account. It is found that the $\Sigma$ yields are suppressed in the domain of midrapidity and kinetic energy spectra with the potential. The hyperons are emitted in the reaction plane because of the strangeness exchange reaction and reabsorption process in nuclear medium. The $\Sigma^{-}/\Sigma^{+}$ ratio depends on the stiffness of nuclear symmetry energy, in particular in the high-energy region (above 500 MeV)., Comment: 5 pages, 4 figures

Published
2021

27. Superheavy nuclei and hypernuclei: extending the limits of the nuclear chart

Author

Chhanda Samanta

Subjects
Physics, Periodic system, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, Transactinide element, Strangeness, 010403 inorganic & nuclear chemistry, 01 natural sciences, Pollution, 0104 chemical sciences, Analytical Chemistry, Nuclear physics, Nuclear Energy and Engineering, Chart, Radiology, Nuclear Medicine and imaging, Dimension (data warehouse), Row, Spectroscopy, Transuranium element
Abstract

Emergence of superheavy nuclei and hypernuclei, two fields of intense research in nuclear physics, has made a big impact on the nuclear chart; while the discovery of the superheavy oganesson has completed the seven full rows of the periodic table, discovery of several exotic hypernuclei have added a third dimension, called strangeness, to the existing nuclear chart. Highlights of some recent developments in these two fields are presented

Published
2019
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28. Measurement of Bs0 meson production in pp and PbPb collisions at sNN=5.02 TeV

Author

Fan Xia, Dietrich Liko, Mykhailo Dalchenko, Boris Grynyov, Shengquan Tuo, Abhigyan Dasgupta, Nikolai Skatchkov, Louis Antonelli, Jingyu Luo, S. Choi, Stephen Sanders, Mia Tosi, L. Romero, Prashant Shukla, Ayman Al-bataineh, Prafulla Kumar Behera, Riccardo Andrea Manzoni, Christian Veelken, Yu. Andreev, Markus Klute, David Petyt, A. Escalante Del Valle, Joosep Pata, Colin Bernet, Ugur Kiminsu, André Rosowsky, Andrew Ivanov, W. Van Doninck, Hans Rykaczewski, Y. J. Mao, Chiara Mariotti, Hamed Bakhshiansohi, Stephan Linn, Marguerite Tonjes, Joel Goldstein, Luciano Ristori, Milena Misheva, Luigi Calligaris, Kevin Pedro, Silvano Tosi, Ryan Heller, Martti Raidal, Pamela Klabbers, S. Sarkar, Marco Monteno, Alexey Volkov, Burin Asavapibhop, P. E. Karchin, David Yu, Alessio Boletti, Jie Zhang, Francesca Romana Cavallo, Viktor Savrin, Mitchell Wayne, Karol Bunkowski, David Mark Raymond, Olivier Bondu, E. O. Olaiya, Christophe Delaere, Jose Monroy, Alex Kamenev, Victor Kim, Willem Verbeke, Armando Lanaro, Daniel Bloch, Maxime Guilbaud, Daniel Treille, Kelvin Mei, S. R. Dugad, D. De Jesus Damiao, Jeremy Mans, Vivek Sharma, Markus Stoye, C. Wissing, A. Castaneda Hernandez, Robert Hirosky, I. D. Sandoval Gonzalez, Xunwu Zuo, Matthew Nguyen, V. Rodríguez Bouza, P. D. Dauncey, A. Castro, Tanvi Wamorkar, German Martinez, Zainol Abidin Ibrahim, Vladimir Chekhovsky, Pedro G Mercadante, Anupam Sharma, Andrzej Pyskir, Giorgio Maggi, Sadia Khalil, C. Fernandez Bedoya, Fabio Cossutti, Igor Katkov, Stefan Grünendahl, Joachim Mnich, Robert Schöfbeck, D. E. Pellett, Konstantinos Theofilatos, T. Susa, Giannis Flouris, Cristina Botta, Georg Sieber, Viesturs Veckalns, Gregor Kasieczka, Fotios Ptochos, Alain Hervé, Yuri Skovpen, A. Di Mattia, Giuseppe Benedetto Cerati, Stavros Mallios, Johannes Wittmann, James D. Olsen, N. V. Krasnikov, Aobo Zhang, M. G. Albrow, Sandor Czellar, P. Kontaxakis, Manuel Giffels, Pavel Bunin, Guo-Ming Chen, Menglei Sun, Arabella Martelli, Muhammad Ahmad, Suman Bala Beri, Helena Bialkowska, Y. Chao, Lesya Shchutska, Hans-Christian Kaestli, Guido Tonelli, G. L. Pinna Angioni, Philip Harris, Ivan Vila, S. Carrillo Moreno, Riccardo Bellan, J. S. H. Lee, D. Matos Figueiredo, Noemi Beni, Shawn Zaleski, Rishi Patel, Y. D. Oh, K. S. Lee, David J. Smith, Fabrizio Palla, William John Womersley, Vivian O'Dell, Andrea Massironi, Raffaella Radogna, Piotr Traczyk, Suresh C Tonwar, Sylvie Braibant-Giacomelli, Jeffrey Roskes, Tariq Aziz, M. A. B. Ali, Dave M Newbold, M. Della Negra, J. Seixas, Dario Bisello, Pascal Paganini, R. Walsh, Markéta Jansová, Francesco Navarria, Merve Ince, Maria Isabel Josa, Zeljko Antunovic, Christoph Paus, Piergiulio Lenzi, Claudio Grandi, Andrey Demiyanov, Jonas Rembser, S. Zhang, J. S. Lange, Mario Maggi, M. Tadel, Ernesto Migliore, Hans-Jürgen Simonis, Marko Dragicevic, F. De Guio, Pierluigi Paolucci, Sébastien Gadrat, Mayda Velasco, M. Melo De Almeida, Dimitri Bourilkov, S. W. Cho, Andrew Whitbeck, Viktor Veszpremi, Abdulla Abdulsalam, Michael Seidel, I. Gonzalez Caballero, Shabnam Jabeen, T. Aushev, Christopher George Tully, Kevin Mcdermott, Dmytro Kovalskyi, T. Weiler, Todd Adams, Andrew Wightman, V. Kutzner, Lieselotte Moreels, George Karathanasis, Shalhout Shalhout, Y. Choi, Brandon Allen, Gyorgy Vesztergombi, Ali Harb, Frank Jm Geurts, Smarajit Karmakar, Arnaud Steen, Boaz Klima, Pavel Parygin, J. S. Kim, Michael Tytgat, Samila Muthumuni, Maciej Misiura, Hongfang Liu, David Lange, Gilvan Alves, M. Pelliccioni, Robin Erbacher, Vladimir Korotkikh, Wit Busza, Mikhail Danilov, Pieter David, Olga Evdokimov, Junghwan Goh, Livio Fanò, Senta Greene, Jongjeong Kim, M. A. Mahmoud, Jingzhou Zhao, Etiennette Auffray, Alexey Baskakov, Georg Auzinger, M. Aldaya Martin, Harvey B Newman, Jeffrey Berryhill, J. D. Tapia Takaki, Melike Akbiyik, Maurizio Biasini, A. Yagil, Sinan Sagir, A. Kayis Topaksu, H. A. Salazar Ibarguen, Marta Felcini, Y. Mohammed, Cameron Bravo, A. Moraes, Tomas Lindén, N. Van Remortel, Alice Florent, G. P. Van Onsem, Zaixing Mao, O. Gonzalez Lopez, Pedro Silva, J. Mejia Guisao, Hui Li, Eva Halkiadakis, Frank Glege, Iurii Antropov, Alexander Belyaev, Claudio Campagnari, Nikitas Loukas, Emine Gurpinar, Sabino Meola, Roberto Covarelli, Sergio Cittolin, Jared Sturdy, Kaya Tatar, A. Bornheim, Anna Teresa Meneguzzo, Teppo Mäenpää, Peisen Ma, Stephanie Brandt, K. Wong, Yen-Jie Lee, Sandra S. Padula, Yiwen Wen, Paolo Vitulo, Maximilian Knut Kiesel, William J Spalding, Jay Roberts, Doga Gulhan, Louis Lyons, R. Mankel, Stefano Bianco, Jaana Kristiina Heikkilä, Hugues Lattaud, Wolfgang Lohmann, H. S. Chen, Yury Ivanov, Andre Sznajder, Mani Tripathi, Rachel Bartek, Marco Peruzzi, Usama Hussain, Owen Rosser Long, Warren Clarida, Dana Z. Anderson, Cesare Calabria, M. Csanad, Daniel Pitzl, Nicola Amapane, Joaquin Emilo Siado, Matteo Sani, Andreas Nowack, Mauro Donegà, Igor Bayshev, H. Keller, Filip Moortgat, Konstantinos Kousouris, Arne Reimers, Joshua Bendavid, Nicanor Colino, Serdal Damarseckin, Iuri Bagaturia, A. P. Singh, Yuri Gershtein, Emmanuelle Perez, G. G. Da Silveira, Cristina Riccardi, Daniele Vadruccio, Francois Lagarde, A. Romero, Weinan Si, Robert M Harris, G. Correia Silva, Elliot Hughes, Andrew Buccilli, Charles C. Richardson, James Bowen, Daniele Spiga, Maksat Haytmyradov, Paolo Montagna, Andrew Ackert, Koushik Mandal, Mikhail Kirsanov, R. Cousins, Junquan Tao, O. Kukral, Abhisek Datta, O. Hlushchenko, Tiziano Rovelli, J. Alexander, G. M. Bilei, David Jonathan Hofman, Othmane Bouhali, Carlos Erice, H. Zhang, David Mason, Anton Babaev, Kirika Uchida, P. Van Mechelen, A. Apyan, L. V. Kardapoltsev, Amitabh Lath, Simon Kudella, Alberto Benvenuti, Angela Mehta, Andrey Marinov, Candan Isik, Zukhaimira Zolkapli, Shubham Pandey, Wei Shi, O. Rieger, Thomas Klijnsma, Mikhail Gavrilenko, W. S. Hou, Nadezda Chernyavskaya, Maria Agnese Ciocci, Maria Florencia Canelli, Fabrizio Ferro, Thomas Ferbel, Marta Ruspa, Stepan Obraztsov, Andrew Beretvas, Otto Hindrichs, S. Mitra, Aashaq Shah, Lukas Bäni, T. Tabarelli de Fatis, C. Martinez Rivero, Giorgio Apollinari, Ulf Behrens, Luigi Moroni, Luca Lista, L. R. Sulak, M. A. Segura Delgado, M. A. Shah, Ketino Kaadze, Anshul Kapoor, Juska Pekkanen, M. Franco Sevilla, Andrew Hart, Demetrios Loukas, Erik Butz, Jan Kieseler, Giulia Negro, Charles Mueller, Benjamin Mesic, F. Pandolfi, Teruki Kamon, Dmitry Elumakhov, James Buchanan, Maxim Pieters, A. Di Francesco, Ulrich Heintz, M. Kovac, Arun Kumar, Christian Contreras-Campana, E. W. Vaandering, Alexander Titterton, Gabriella Pugliese, I. Van Parijs, Kevin Lannon, G. Della Ricca, Samandeep Sharma, Jesus Marco, David Krofcheck, J. P. Fernández Ramos, Anirban Saha, Andrew Evans, Ekaterina Avdeeva, Roberto Leonardi, Alexander Barnyakov, Vyacheslav Valuev, Ren-Yuan Zhu, Pascal Vanlaer, Luciano Barone, Richard Breedon, L. S. Durkin, Souvik Das, Giacomo Bruno, Tomas Hreus, Damir Devetak, Michele Bianco, Erhan Gülmez, Kaori Maeshima, W. E. Johns, Mariana Shopova, Martin Erdmann, Giuseppe Fasanella, Sung Keun Park, Andrew Wisecarver, Patricia McBride, Krzysztof Doroba, Dylan Rankin, Andrew Brinkerhoff, Thomas Ferguson, Guenakh Mitselmakher, S. Orfanelli, Gianni Masetti, Márton Bartók, Bugra Bilin, Kati Lassila-Perini, V. Re, Markus Merschmeyer, Eduardo Coelho, Ozlem Kaya, André Holzner, Natalia Lychkovskaya, Sevil Salur, Y. Wang, Jim Hanlon, D. Soldi, Jordan Damgov, D. Di Croce, Francesca Cenna, Alberto Ruiz-Jimeno, Peter Hansen, Timo Peltola, Michael Schmitt, Carlo Rovelli, Andris Skuja, Sébastien Brochet, Ivica Puljak, Hans Reithler, Kisung Lee, Ben Bylsma, Roberto Tenchini, Meng Xiao, Silvio Donato, Ezio Torassa, Stephane Perries, Carsten Heidemann, Costas Foudas, Eric Christian Chabert, Devdatta Majumder, Dominique Gigi, Jose Flix, Gabriel Ramirez-Sanchez, Olivér Surányi, Olena Karacheban, A. Khan, Gouranga Kole, Bruno Galinhas, Jose Chinellato, Richard Cavanaugh, Regina Demina, Reyer Band, Sourabh Dube, Sean Flowers, Sandeep Bhowmik, Matthew Walker, Korbinian Schweiger, Anna Kropivnitskaya, P. de Barbaro, Salvatore My, T. A. Gómez Espinosa, James Dolen, Harry Cheung, Andrew Johnson, Freya Blekman, Peter Schleper, Pushpalatha C Bhat, Jian Sun, Artur Kalinowski, Marco Alexander Harrendorf, Dmitry Philippov, Fábio Lúcio Alves, Efe Yazgan, Deborah Duchardt, G. B. Yu, Peter Robmann, Andrey Popov, Tiziano Camporesi, Basile Vermassen, Jay Mathew Lawhorn, Claude Amsler, Brent Yates, Petra Merkel, Didier Contardo, Y. Chen, De Hua Zhu, Laurent Favart, Jorge Chaves, A. De Cosa, Hannes Sakulin, Alice Magnani, Tilman Rohe, Jing Wang, Sara Nabili, M. Bluj, Si Xie, Jacobo Konigsberg, G. P. Siroli, Zhen Hu, Keith Ulmer, Zoltan Laszlo Trocsanyi, J. Conway, D. Del Re, Andrea Triossi, Christoph Schwick, J. Vaitkus, Robert Stone, Cristian Pena, Vincent Lemaitre, K. Wichmann, P. Kyberd, Anton Taurok, Ivan Pozdnyakov, Ruchi Chudasama, Thomas Reis, Martin Lipinski, Viatcheslav Stolin, L. J. Gutay, David Curry, Marco Rovere, Kristian Harder, Stefan Wayand, D. Cutts, Michael Benjamin Andrews, Simone Paoletti, Suchandra Dutta, J. A. Murillo Quijada, Giulio Mandorli, Anne-Marie Magnan, Wagner Carvalho, Marco Toliman Lucchini, Mauricio Thiel, Paul Baillon, Artur Apresyan, V. Andreev, Rostyslav Shevchenko, M. Weber, Francesco Fienga, Aruna Nayak, Dustin Burns, L. J. Sanchez Rosas, Urs Langenegger, Martino Dall'Osso, Hallie Trauger, Adrian Byszuk, Frank Würthwein, Michael Plagge, Crisostomo Sciacca, Maxim Goncharov, Manas Maity, K. Ehataht, Marco Pieri, Zuhal Seyma Demiroglu, Thomas Strebler, Marc Osherson, Vladimir Cherepanov, Gervasio Gomez, Marc Besancon, Dinyar Rabady, Wolfram Dietrich Zeuner, Alexi Mestvirishvili, Hasan Ogul, R. Taus, Ulrich Goerlach, Roy Montalvo, Joze Zobec, Santeri Laurila, Sergey Rusakov, Ilya Gorbunov, Andreas Güth, Peter Timothy Cox, Massimo Casarsa, Steve Nahn, Marco Meschini, Malgorzata Kazana, R. Sharma, Michael Mulhearn, Paolo Capiluppi, James Rohlf, Carlos Avila, Sergei Bitioukov, A. Delgado Peris, Rishika Bhardwaj, János Karancsi, Daniel Salerno, John Perry Cumalat, Swagata Mukherjee, Raúl Iraq Rabadán-Trejo, Alexander Schmidt, A. Starodumov, Ravi Janjam, Siddharth Narayanan, Anton Karneyeu, Leonard Apanasevich, M. Vander Donckt, Jochen Schieck, R. Wilkinson, Luciano Orsini, Luca Pacher, Nadir Daci, David Sheffield, Claire Shepherd-Themistocleous, Antonis Agapitos, Thi Hien Doan, Daniel Denegri, Hartmut Stadie, Natascha Krammer, Rohan Bhandari, Vinay Hegde, David Zou, James Zabel, Louise Skinnari, Vito Palladino, Nural Akchurin, Hannu Siikonen, Frank Jensen, Laura Dodd, Andrew Levin, Anton Stepennov, Andrey Gribushin, Ashley Parker, D. H. Miller, Y. Musienko, M. C. Fouz, Samuel Boren, Ricardo Eusebi, Christopher Mcginn, Terhi Jarvinen, Greg Landsberg, Cécile Caillol, Daniel Robert Marlow, Manjit Kaur, Anna Colaleo, Francesco Fiori, Yildiray Komurcu, Philippe Busson, J. L. Dulemba, Benoit Courbon, Raffaello D'Alessandro, Andrei Sobol, Gabriella Pasztor, Andrey Korytov, Martina Malberti, Hannes Mildner, Sridhara Dasu, Emilio Meschi, P. Chang, Eduardo De Moraes Gregores, A. Vorobyev, E. E. Boos, Ruslan Chistov, Kadri Ozdemir, Heriberto Castilla-Valdez, Giuseppe Zito, Ilse Krätschmer, David Michael Morse, Juan Garcia-Ferrero, Alexei Raspereza, G. Hamel de Monchenault, Aditee Rane, Ettore Focardi, Vallary Bhopatkar, John Rander, C. Neu, Thong Nguyen, David Overton, Thea Klaeboe Aarrestad, Haiyan Wang, Filippo Errico, Deepak Kumar Sahoo, V. Myronenko, Simone Gennai, Bibhuprasad Mahakud, G. Gomez Ceballos, Nikos Varelas, Helen F Heath, Giuliana Galati, Giuseppe Barbagli, Suneel Dutt, Quan Wang, Ashfaq Ahmad, Ilya Kravchenko, Jeroen Hegeman, Maria Teresa Grippo, Anatoli Zarubin, Sang Il Pak, Roberto Sacchi, S. Baur, Yves Sirois, Mehmet Oglakci, Li Li, O. Zenaiev, James Wetzel, Th. Müller, Alberto Santoro, H. S. Kim, Monika Grothe, Grigory Safronov, Emanuele Usai, Tejinder Virdee, Nicolò Tosi, M. Jones, Camilla Galloni, Charalambos Nicolaou, Niki Saoulidou, Sercan Sen, D. P. Stickland, Y. H. Chang, Zhenyu Chen, Geoffrey Smith, Jan Krolikowski, Luiz Mundim, Alexandre Zabi, S. 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Kellogg, Borislav Pavlov, Vladimir Karjavine, Csaba Hajdu, Emyr Clement, C. Fallon, Mario Masciovecchio, Huilin Qu, James Letts, L. Viliani, Troy Mulholland, James Castle, Seungkyu Ha, F. L. Fabbri, Daniele Fasanella, D. Green, Sema Zahid, Sergei Gleyzer, Ana Ovcharova, Andrea Venturi, M. Khakzad, Rino Castaldi, Brian Dorney, Mariarosaria D'Alfonso, Mario Galanti, Zoltan Szillasi, F. Rezaei Hosseinabadi, Andrey Uzunian, Christopher Palmer, Annika Vanhoefer, Alice Bean, Balazs Ujvari, Shervin Nourbakhsh, S. Belforte, Marius Teroerde, Nabarun Dev, Johan Borg, L. F. Chaparro Sierra, A. Bermúdez Martínez, Vipin Bhatnagar, T. Liu, Min-Hye Kim, Georgia Karapostoli, Ece Aşılar, K. F. Chen, Lei Feng, L. Malgeri, Kamuran Dilsiz, Steven Wasserbaech, Seema Bahinipati, Paolo Rumerio, Lorenzo Uplegger, D. A. Sanz Becerra, J. A. Nash, Elisabetta Gallo, Vincenzo Ciriolo, Christian Autermann, Tomasz Frueboes, G. Grenier, Nathan Kellams, Can You, Kenneth Bloom, Robin Aggleton, Ferhat Ozok, Thomas Perry, Prasanna Siddireddy, M. De Mattia, G. Quast, T. Geralis, Jaehyeok Yoo, Mateusz Zarucki, Hannsjoerg Artur Weber, Gordon H. Hanson, Antoni Shtipliyski, Erich Schmitz, Lutz Feld, Shahram Rahatlou, S. Tkaczyk, David Stuart, Alice Mignerey, A. Benecke, Evgenii Tarkovskii, Stefanos Leontsinis, Chayanit Asawatangtrakuldee, Vladimir Epshteyn, Raffaele Gerosa, Alexander Ledovskoy, Vincent J Smith, Ioanna Papavergou, David Sperka, Gaelle Boudoul, Wolfgang Waltenberger, Alexis Kalogeropoulos, F. Vazzoler, Lovedeep Kaur Saini, Xin Chen, Teresa Rodrigo, Jian-Guo Bian, Andrey Pozdnyakov, H. Van Haevermaet, R. D. Field, Sam Harper, Shuichi Kunori, Teresa Lenz, Laurent Mirabito, C. Beirão Da Cruz E Silva, Steven Lowette, M. A. Bhat, C. S. Moon, Brian L Winer, Mehmet Özgür Sahin, Donato Creanza, Marc Dobson, Heiner Tholen, Umberto Dosselli, M. Gola, Giacomo Ortona, J. Taylor, T. Boccali, Maurizio Pierini, David Cussans, Josef Hrubec, E. A. De Wolf, Salim Cerci, Yuta Takahashi, C. Oropeza Barrera, Sioni Summers, Sumit Keshri, D. Horvath, Mohsen Naseri, S. Di Guida, Giorgia Rauco, Nancy Marinelli, Bajrang Sutar, Plamen Iaydjiev, E. Ayala, Jasper Lauwers, Wajid Ali Khan, A. G. Stahl Leiton, Inna Kucher, Ping Tan, Tuure Tuuva, Elizabeth Kennedy, Margaret Zientek, Unki Yang, Ozgun Kara, Daniel Gastler, Alain Givernaud, Seth Moortgat, P. Sphicas, Anindya Roy, Muhammad Waqas, Izaak Neutelings, Predrag Milenovic, Peter R Hobson, Kin Ho Lo, E. Eskandari Tadavani, Sudarshan Paramesvaran, Victor Daniel Elvira, Bilal Kiani, Alexander Snigirev, F. Hartmann, Stephane Cooperstein, S. Ragazzi, John Strologas, J. Fernandez Menendez, Charles Maguire, J. R. González Fernández, Clemens Wöhrmann, Yeonju Go, A. Vagnerini, Christophe Ochando, Francesco Santanastasio, Stoyan Stoynev, A. Sanchez-Hernandez, Tongguang Cheng, Sergo Jindariani, J. Schwandt, Caleb Smith, Florian Michael Pitters, John Bradmiller-Feld, John Hakala, Alexander Bylinkin, D. Kim, Daniel Teyssier, T. Lenzi, Victor Perelygin, Manisha Lohan, Alessandra Fanfani, J. Duarte Campderros, Frixos A Triantis, Andrew Askew, R. L. Lander, Gurpreet Singh, M. Olmedo Negrete, Miao Hu, Karl Gill, Yacine Haddad, S. Sanchez Cruz, Mauro Menichelli, Tamás Álmos Vámi, A. Da Rold, Luca Perniè, Roland Horisberger, Georgios Mavromanolakis, Michele Arneodo, Elisa Manoni, S. Luo, Brieuc Francois, Thomas Madlener, G. F. Chen, Christopher Rogan, A. Pérez-Calero Yzquierdo, Nicolas Chanon, Helena Malbouisson, Alex J. Barker, S. Lo Meo, Camelia Mironov, Benedikt Vormwald, Ilknur Hos, J. N. Butler, Genius Walia, Paolo Lariccia, Dmitry Sosnov, Chad Freer, Stefan Piperov, Alexander Dierlamm, Caleb Fangmeier, D. R. Mendis, Igor Vorobiev, Martin Delcourt, Francesco Fallavollita, Michal Szleper, Roberto Chierici, Chia-Ming Kuo, P. Major, Nadia Pastrone, Julie Managan Hogan, Panos A Razis, Steven R. Simon, John Gabriel Acosta, Candan Dozen, C. Diez Pardos, Michael Wayne Arenton, Sean Kalafut, Shalini Thakur, James John Brooke, Cédric Prieels, Laura Borrello, Paul Lujan, Martina Ressegotti, P. Schütze, Oleksii Turkot, Michele Selvaggi, O. Behnke, Gulsen Onengut, Viktor Matveev, H. Lee, Carlo Civinini, Clemens Lange, K. Sandeep, Santiago Folgueras, George Alverson, X. Y. Gao, Roman Kogler, Satoshi Hasegawa, Benjamin Kreis, A. Bodek, Oleksii Toldaiev, Nadja Strobbe, Mark Pesaresi, Jean-Laurent Agram, G. Paspalaki, Claudia Ciocca, S. Shmatov, F. Torres Da Silva De Araujo, Anthony Moeller, Vineet Kumar, Gregor Mittag, Jennifer Chu, J. H. Kim, Viktor Khristenko, Gaël Perrin, I. Dremin, Umesh Joshi, P. De Castro Manzano, Irina Vardanyan, Aristotelis Kyriakis, Achim Geiser, Alexander Morton, Javier Cuevas, Claus Kleinwort, Marcello Abbrescia, Sanjay Kumar, Ali Celik, Danila Tlisov, Ferenc Sikler, Mauro Verzetti, Mario Kadastik, Alexander Dermenev, V. M. Ghete, Andres Tiko, Milena Quittnat, A. M. Rossi, Andrés G Delannoy, Christopher Hill, Paul Sheldon, Yuichi Kubota, Andreas Albert, Philipp Pigard, Dong Ho Moon, Adam Elwood, R. Loveless, Alessio Magitteri, Byung-Sik Hong, Michael Hildreth, M. S. Meyer, Matthew Joyce, Sami Lehti, Adish Vartak, Anastasia Karavdina, David Bertsche, Valentina Mariani, Ivan Shvetsov, Igor Golutvin, Mircho Rodozov, T. W. Wang, Bożena Boimska, Kerem Cankocak, Harrison Prosper, Marta Baselga, Stephen Robert Wagner, Young Ho Shin, Sourav Dey, P. Priyanka, Jennifer Ngadiuba, Nicola Bacchetta, Attila Racz, Roberta Arcidiacono, Christian Schnaible, Jonathan Fulcher, Anatoli Pashenkov, Avto Kharchilava, Mikhail Ignatenko, Jelena Luetic, Tapio Lampén, Claudia Cecchi, Norraphat Srimanobhas, Dermot Moran, Seth Cooper, S. Williamson, Semra Turkcapar, Linda Finco, Mingshui Chen, Matthias Komm, Arnab Purohit, Simona Cometti, Scott Thomas, S. W. Lee, J. D. Richman, Predrag Cirkovic, Viola Sordini, Erika Garutti, Giancarlo Mantovani, Carlo Battilana, Sezen Sekmen, Charles Ferraioli, Z. Liu, Pooja Saxena, Maximilian Heindl, Alexander Savin, M. Finger, Julie Malcles, Fengwangdong Zhang, and B. McMaster

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Perturbative QCD, Parton, Strangeness, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, B meson, Rapidity, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The production cross sections of Bs0 mesons and charge conjugates are measured in proton-proton (pp) and PbPb collisions via the exclusive decay channel Bs0→J/ψϕ→μ+μ−K+K− at a center-of-mass energy of 5.02 TeV per nucleon pair and within the rapidity range |y

Published
2019
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29. Study of Pion Transverse Momentum Distributions in Ultra-Relativistic Heavy Ion Collisions: A USTFM Approach

Author

R. Ahmad, Rameez Ahmad Parra, Saeed Uddin, Inam-ul Bashir, Hamid Nanda, and Waseem Bashir

Subjects
Physics, Large Hadron Collider, Nuclear Theory, General Physics and Astronomy, Strangeness, Collision, 01 natural sciences, Nuclear physics, Transverse plane, Pion, Flow (mathematics), Flow velocity, 0103 physical sciences, Thermal, Nuclear Experiment, 010306 general physics
Abstract

The mid-rapidity (|y| < 0.5) transverse momentum distributions of identified charged pions produced in different collision systems at different centre-of-mass energies ( $${{\sqrt S }_{{NN}}}$$ ) ranging from RHIC to LHC have been studied using our early proposed unified statistical thermal freeze-out model (USTFM). We have also studied the effect of different collision centralities on the mid-rapidity (|y| < 0.5) production of pions. Our model results are found to be in good agreement with the experimental data. Different thermal freeze-out conditions which include transverse flow, thermal freeze-out temperature, and velocity profile have been extracted by providing the best fit to the experimental data points. We have incorporated the effects of transverse as well as longitudinal flow in this analysis. The effects of heavier decay resonances are also taken into account. Moreover, the strangeness conservation criteria have also been imposed in this analysis of pion distributions. The calculated freeze-out parameters indicates that the freeze-out temperature increases with decreasing centrality, while the transverse flow velocity increases by increase in the centrality of the colliding system.

Published
2019
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30. Strangeness in Neutron Star Cooling

Author

Chang-Hwan Lee, Chang Ho Hyun, and Yeunhwan Lim

Subjects
Nuclear Theory, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, General Physics and Astronomy, 02 engineering and technology, Strangeness, 01 natural sciences, Nuclear Theory (nucl-th), Nuclear physics, Momentum, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Thermal, Neutron, Nuclear Experiment, High Energy Astrophysical Phenomena (astro-ph.HE), 010302 applied physics, Physics, Hyperon, 021001 nanoscience & nanotechnology, High Energy Physics - Phenomenology, Neutron star, High Energy Physics::Experiment, Astrophysics - High Energy Astrophysical Phenomena, 0210 nano-technology, Nucleon, Fermi Gamma-ray Space Telescope
Abstract

We study the thermal evolution of neutron stars in the presence of hyperons or kaons in the core. Our results indicate that the nucleon and hyperon direct Urca processes play crucial roles for the cooling of neutron stars. The presence of hyperons drives fast cooling mechanisms in two ways: 1) it allows the hyperon direct Urca prior to the nucleon direct Urca, 2) and it makes the nucleon direct Urca more feasible by reducing the neutron Fermi momentum. We found that the neutron star equation of state (EOS) with hyperons can be consistent with both mass and temperature observations. We also found that the neutron star EOS with kaon condensation can be consistent with observations, even though the cooling behavior is seldom useful to identify or isolate the effect of kaon condensation., 7 pages, 7 figures

Published
2019
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31. Recent results for STAR sNN=4.9GeV Al+Au and sNN=4.5GeV Au+Au Fixed-Target Collisions

Author

Yu-Gang Ma and Sonia Kabana

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, Elliptic flow, Strangeness, 01 natural sciences, Spectral line, Nuclear physics, Pion, 0103 physical sciences, Transverse mass, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, STAR detector
Abstract

We present recent results from Al(beam)+Au(target) collisions at s N N = 4.9 GeV and Au+Au collisions at s N N = 4.5 GeV from the STAR fixed-target (FXT) program. We report transverse mass spectra of protons, K S 0 and Λ, rapidity density distributions of π ± , K S 0 and Λ, directed flow of protons, π ± , K S 0 and Λ, and elliptic flow of protons and π ± . These are the first measurements of pion directed and elliptic flow in this energy region. Pion and proton elliptic flow show mass ordering. Measurements are compared with published results from AGS and RHIC. These results demonstrate that the STAR detector performs well in the FXT configuration.

Published
2019
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32. J-PARC E07: Systematic Study of Double Strangeness System with Hybrid Emulsion Method

Author

Megumi Naruki, R. Kiuchi, Kazuya Watanabe, S. H. Hwang, A. Koshikawa, Y. Sasaki, J. W. Lee, K. Ito, A. Iskendir, Yuki Sato, A. N. L. Nyaw, T. Nanamura, T. Takeda, Shoichi Hasegawa, S. Y. Matsumoto, Junya Yoshida, Yuki Fujikawa, M. Ichikawa, Masahiro Yoshimoto, Manabu Moritsu, Takayoshi Kawai, Hiroki Ito, K. Miwa, Hitoshi Takahashi, Y. Ogura, Hiroyuki Ekawa, C. S. Yoon, K. Imai, K. Inaba, D. H. Zhang, H. Kanauchi, W. S. Jung, Yoshiro Takahashi, Hitoshi Sugimura, Kazuma Nakazawa, T. Hashimoto, Manami Fujita, J. Y. Sohn, Jihwa Lee, Shunsuke Kanatsuki, K. Tanida, H. Sako, T. L. Ma, T. Hayakawa, A. T. Moe, M. Hirose, S. Kinbara, D. Nakashima, M. H. Kim, K. Oue, Y. Nakada, T. J. Moon, M. Minakawa, Myint Kyaw Soe, T. Takahashi, K. Agari, E. Umezaki, Toyoki Watabe, Seongbae Yang, S. Ashikaga, Y. C. Han, Yoshikazu Ishikawa, Mifuyu Ukai, M. Ohashi, Masaharu Ieiri, Kazuhiro Suzuki, Aye Moh Moh Theint, Kensuke Kobayashi, M. M. Soe, K. Hosomi, Manami Nakagawa, K. Hicks, S. Hoshino, Kotaro Shirotori, Yuya Akazawa, S. Y. Ryu, S. H. Kim, E. Hayata, B. Bassalleck, A. Kasagi, Z. Zhang, J. K. Ahn, J. Pochodzalla, Khin Than Tint, Shuhei Hayakawa, T. O. Yamamoto, Takeshi Koike, Y. Toyama, S. Sato, S. Ozawa, N. Fujioka, Ryotaro Honda, Yoko Endo, Y. Ichikawa, T. Akaishi, K. Hoshino, Erina Hirose, S. Bleser, Y. Nagase, Hitoshi Tamura, F. Schupp, Hidetaka Kobayashi, and R. Goto

Subjects
Nuclear physics, Physics, Emulsion, J-PARC, Strangeness
Published
2021
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33. The Little-Bang and the femto-nova in nucleus-nucleus collisions

Author

Bedangadas Mohanty, Nu Xu, and Kenji Fukushima

Subjects
Canonical ensemble, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, QC1-999, Nuclear Theory, High Energy Physics::Phenomenology, General Medicine, Plasma, Strangeness, Vorticity, Collision, 01 natural sciences, Nuclear physics, Critical point (thermodynamics), 0103 physical sciences, Nuclear Experiment, 010306 general physics, QCD matter
Abstract

We make a theoretical and experimental summary of the state-of-the-art status of hot and dense QCD matter studies on selected topics. We review the Beam Energy Scan program for the QCD phase diagram and present the current status of the search for the QCD critical point, particle production in high baryon density region, hypernuclei production, and global polarization effects in nucleus-nucleus collisions. The available experimental data in the strangeness sector suggests that a grand canonical approach in the thermal model at high collision energy makes a transition to the canonical ensemble behavior at low energy. We further discuss future prospects of nuclear collisions to probe properties of baryon-rich matter. Creation of a quark-gluon plasma at high temperature and low baryon density has been called the “Little-Bang” and, analogously, a femtometer-scale explosion of baryon-rich matter at lower collision energy could be called the “femto-nova”, which could possibly sustain substantial vorticity and a magnetic field for non-head-on collisions.

Published
2021
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34. Progress in strangeness nuclear physics at J-PARC

Author

Tomofumi Nagae

Subjects
Nuclear physics, Physics, Beamline, Proton Synchrotron, J-PARC, Strangeness, Beam (structure), Intensity (physics)
Abstract

In this article, recent experimental topics obtained at J-PARC are discussed. Owing to beam power increase of the J-PARC main proton synchrotron, the K− beam intensity of more than 5 × 105/spill with a repetition rate of 5.52 sec. was available at the K1.8 beam line. It enabled us to study not only strangeness S = −1 systems but also S = −2 systems such as double-Λ hypernuclei and Ξ hypernuclei.

Published
2021
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35. Centrality Dependence of Chemical Freeze-Out Parameters and Strangeness Equilibration in RHIC and LHC Energies

Author

Deeptak Biswas

Subjects
Nuclear and High Energy Physics, Strange quark, Article Subject, Nuclear Theory, QC1-999, Hadron, FOS: Physical sciences, Strangeness, 01 natural sciences, Resonance (particle physics), Nuclear Theory (nucl-th), Nuclear physics, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, 010306 general physics, Nuclear Experiment, Quantum chromodynamics, Physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics - Phenomenology, High Energy Physics::Experiment, Chemical equilibrium, Relativistic Heavy Ion Collider
Abstract

We have estimated centrality variation of chemical freeze-out parameters from yield data at mid-rapidity of $\pi^\pm$, $K^\pm$ and $p$, $\bar{p}$ for collision energies of RHIC (Relativistic Heavy Ion Collider), Beam Energy Scan (RHIC-BES) program, and LHC (Large Hadron Collider). We have considered a simple hadron resonance gas model and employed a formalism involving conserved charges ($B, Q, S$) of QCD for parameterization. Along with temperature and three chemical potentials ($T,\mu_B,\mu_Q,\mu_S$), a strangeness under-saturation factor ($\gamma_S$) has been used to incorporate the partial equilibration in the strange sector. Our obtained freeze-out temperature does not vary much with centrality, whereas chemical potentials and $\gamma_S$ seem to have a significant dependence. The strange hadrons are found to deviate from a complete chemical equilibrium at freeze-out at the peripheral collisions. This deviation appears to be more prominent as the collision energy decreases at lower RHIC-BES energies. We have also shown that this departure from equilibrium reduces towards central collisions, and strange particle equilibration may happen after a threshold number of participants in $A$-$A$ collision., Comment: Title, abstract are slightly modified. Results for RHIC-BES 14.5 GeV have been added

Published
2021

36. Effects of Baryon-Anti-baryon Annihilation on the Anti-hyperon to Anti-proton Ratio in Relativistic Nucleus-Nucleus Collisions

Author

Ekata Nandy and Subhasis Chattopadhyay

Subjects
Physics, Annihilation, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Hyperon, Strangeness, Lambda, Deconfinement, Baryon, Nuclear physics, Antiproton, High Energy Physics::Experiment, Nuclear Experiment
Abstract

RHIC’s Beam Energy Scan Program at lower energy and future facilities at FAIR offer a unique opportunity to study Quark-Gluon Plasma (QGP) at high baryon density. The formation of QGP is often characterized by the enhanced production of strange over non-strange particles in central heavy-ion collisions relative to peripheral or proton-proton collisions at the same energy . Previous measurements at RHICs’ AGS and CERN SPS have presented evidence of strangeness enhancement in the light of non-monotonic variation of kaon-to-pion ratio as a function of collision energy. A similar signature was also observed in the baryon sector, where an enhancement in \(\bar{\Lambda }\) to p was reported . However, it still remains unclear whether \(\bar{\Lambda }\) to p enhancements can be uniquely attributed to the strangeness enhancement owing to the deconfinement phase transition. In this article, we will demonstrate that processes like baryon-anti-baryon annihilation in the late hadronic stage may also account for the apparent enhancement in \(\bar{\Lambda }\) to p ratio.

Published
2021
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37. Fluctuations and correlations of net baryon number, electric charge and strangeness in a background magnetic field

Author

Q. Shi, Heng-Tong Ding, Xiao-Dan Wang, and Sheng-Tai Li

Subjects
Quark, High Energy Physics - Theory, Nuclear and High Energy Physics, Strange quark, Nuclear Theory, Hadron, FOS: Physical sciences, Strangeness, 01 natural sciences, Nuclear physics, Nuclear Theory (nucl-th), Pion, High Energy Physics - Lattice, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, High Energy Physics - Lattice (hep-lat), Magnetic field, High Energy Physics - Phenomenology, High Energy Physics - Theory (hep-th), Isospin, Baryon number
Abstract

We present results on the second-order fluctuations of and correlations among net baryon number, electric charge and strangeness in (2+1)-flavor lattice QCD in the presence of a background magnetic field. Simulations are performed using the tree-level improved gauge action and the highly improved staggered quark (HISQ) action with a fixed scale approach ($a\simeq$ 0.117 fm). The light quark mass is set to be 1/10 of the physical strange quark mass and the corresponding pion mass is about 220 MeV at vanishing magnetic field. Simulations are performed on $32^3\times N_\tau$ lattices with 9 values of $N_\tau$ varying from 96 to 6 corresponding to temperatures ranging from zero up to 281 MeV. The magnetic field strength $eB$ is simulated with 15 different values up to $\sim$2.5 GeV$^2$ at each nonzero temperature. We find that quadratic fluctuations and correlations do not show any singular behavior at zero temperature in the current window of $eB$ while they develop peaked structures at nonzero temperatures as $eB$ grows. By comparing the electric charge-related fluctuations and correlations with hadron resonance gas model calculations and ideal gas limits we find that the changes in degrees of freedom start at lower temperatures in stronger magnetic fields. Significant effects induced by magnetic fields on the isospin symmetry and ratios of net baryon number and baryon-strangeness correlation to strangeness fluctuation are observed, which could be useful for probing the existence of a magnetic field in heavy-ion collision experiments., Comment: 12 pages, 7 figures, invited contribution to The European Physical Journal A-Hadrons and Nuclei: Topical Issue on "QCD Phase Diagram in Strong Magnetic Fields", minor revision

Published
2021
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38. Charm hadrons in pp collisions at LHC energy within a coalescence plus fragmentation approach

Author

Vincenzo Greco, Salvatore Plumari, and Vincenzo Minissale

Subjects
Quark, Physics, Nuclear and High Energy Physics, Meson, QC1-999, Hadron, High Energy Physics::Phenomenology, Quark-gluon plasma, FOS: Physical sciences, Heavy quark transport, Strangeness, Baryon, Nuclear physics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Quark–gluon plasma, Relativistic heavy-ion collisions, Rapidity, High Energy Physics::Experiment, Nuclear Experiment, Heavy flavor hadronization, QCD matter
Abstract

The recent experimental measurements on $pp$ collisions at $\sqrt{s}=5.02 \,\rm TeV$ have shown a very large abundance of heavy baryon production corresponding to a ratio of $\Lambda_c/D^0 \sim 0.6$, about one order of magnitude larger than what measured in $e^+e^-$, $ep$ collisions and even in $pp$ collisions at LHC, but at forward rapidity. We apply for the first time to $pp$ collisions a quark coalescence plus fragmentation approach developed for $AA$ collisions, assuming the formation of Hot QCD matter at finite temperature. An approach that has correctly predicted a $\Lambda_c/D \sim O(1)$ in AA collisions at RHIC energy. We calculate the heavy baryon/meson ratio and the $p_T$ spectra of charmed hadrons with and without strangeness content: $D^{0}$, $D_{s}$, $\Lambda_{c}^{+}$, $\Xi_c$ and $\Omega_c$ in $pp$ collisions at top LHC energies, finding a satisfactory result for the measured $\Lambda_{c}^{+}/D^0$ and the $\Xi_c/D^0$ without any specific tuning of parameters to $pp$ collisions. At variance with other approaches a coalescence approach predicts also a significant production of $\Omega_c$ such that $\Omega_c/D^0 \sim O(10^{-1})$ ., Comment: 8 pages, 5 figures; modifications in Figures 1,2,3,4,5 and corrected typos

Published
2021

39. Enhanced Production of Multi-strange Hadrons in Proton-Proton Collisions

Author

Pradip Kumar Sahu, R. C. Baral, M. K. Parida, and Sarita Sahoo

Subjects
Nuclear physics, Physics, Large Hadron Collider, Proton, Relative yield, Nuclear Theory, Hadron, Strangeness production, Baryon number, Strangeness, Nuclear Experiment
Abstract

Strangeness enhancement is proposed as a signature of QGP formation in high-energy nuclear collisions. The observed relative yield enhancements of hadrons increase with the strangeness content but not with the mass and baryon number of the hadron. To understand this behavior, we have studied on the simulation models. We have found the models EPOS and AMPT are not able to explain simultaneously the effect of strangeness canonical suppression in low-multiplicity events and QGP-like effect in high-multiplicity pp collisions at LHC energies.

Published
2021
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40. Measurement of Higher Moments of Net-particle Distributions in STAR

Author

Debasish Mallick

Subjects
Nuclear physics, Physics, Quantum chromodynamics, Proton, Nuclear Theory, Multiplicity (mathematics), Charge (physics), Baryon number, Strangeness, Nuclear Experiment, Electric charge, Energy (signal processing)
Abstract

Studying fluctuations of conserved quantities, such as baryon number (B), strangeness (S) and electric charge (Q), provides insights into the bulk properties of matter created in high-energy nuclear collisions. The higher moments of multiplicity distributions of net proton, net kaon and net charge are expected to show large fluctuations near the QCD critical point. We present results on energy and centrality dependence of higher moments of net proton, net kaon and net charge multiplicity distribution over all BES-I energies from the STAR experiment. The net proton moments product (\(S\sigma \) and \(\kappa \sigma ^{2}\)) shows deviations from Poisson baseline (unity) in the lower beam energy region (below \(\sqrt{s_{\mathrm {NN}}}\) = 27 GeV). In the most central (0–5%) collisions, the \(\kappa \sigma ^{2}\) of net proton distribution as a function of collision energy exhibit a non-monotonic behaviour and show deviation in the lower energy region from corresponding predictions from Poisson baseline, a transport model (UrQMD) and a thermal model, all of which do not include any physics of criticality.

Published
2021
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41. Silicon drift detectors technology for high precision light Kaonic atoms spectroscopic measurements at the DA Φ NE collider

Author

L. De Paolis, Marco Miliucci, G. Deda, Johann Marton, M. Iliescu, D. Bosnar, Magdalena Skurzok, C. Guaraldo, P. Levi Sandri, Fabrizio Napolitano, K. Piscicchia, Mario Bragadireanu, Carlo Fiorini, Alberto Clozza, R. Del Grande, J. Zmeskal, Florin Sirghi, Catalina Curceanu, Diana Sirghi, M. Bazzi, Hexi Shi, Michael Cargnelli, M. Iwasaki, O. Vazquez Doce, Marco Carminati, Szymon Niedźwiecki, Paweł Moskal, Michał Silarski, A. Spallone, F. Sgaramella, P. King, Alessandro Scordo, and M. Tüchler

Subjects
Physics, Silicon, Strong interaction, Detector, Resolution (electron density), chemistry.chemical_element, Strangeness, law.invention, Nuclear physics, Data acquisition, chemistry, law, Collider, Line (formation)
Abstract

The SIDDHARTA-2 collaboration developed an innovative large area Silicon Drift Detectors technology to perform high precision spectroscopy for the investigation of the K¯ N strong interaction in the low-energy regime, in the strangeness sector. The SIDDHARTA-2 devices take advantage of special geometry to maximize the experimental geometrical acceptance together with a dedicated Front End electronics able to provide energy resolution of 163 1 eV at 170 K for the Fe Kα line and a linear response better than 10-3, both preserved along the whole DAQ analog-digital chain in a colliding beams challenging environment. In this work the SIDDHARTA-2 Silicon Drift Detectors spectroscopic characterization and the preliminary results obtained at the DAΦNE collider of Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali di Frascati are presented.

Published
2021
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42. PANDA Phase One

Author

Barucca, G., Davì, F., Lancioni, G., Mengucci, P., Montalto, L., Natali, P. P., Paone, N., Rinaldi, D., Scalise, L., Krusche, B., Steinacher, M., Liu, Z., Liu, C., Liu, B., Shen, X., Sun, S., Zhao, G., Zhao, J., Albrecht, M., Alkakhi, W., Bökelmann, S., Coen, S., Feldbauer, F., Fink, M., Frech, J., Freudenreich, V., Fritsch, M., Grochowski, J., Hagdorn, R., Heinsius, F. H., Held, T., Holtmann, T., Keshk, I., Koch, H., Kopf, B., Kümmel, M., Küßner, M., Li, J., Linzen, L., Maldaner, S., Oppotsch, J., Pankonin, S., Pelizäus, M., Pflüger, S., Reher, J., Reicherz, G., Schnier, C., Steinke, M., Triffterer, T., Wenzel, C., Wiedner, U., Denizli, H., Er, N., Keskin, U., Yerlikaya, S., Yilmaz, A., Beck, R., Chauhan, V., Hammann, C., Hartmann, J., Ketzer, B., Müllers, J., Salisbury, B., Schmidt, C., Thoma, U., Urban, M., Bianconi, A., Bragadireanu, M., Pantea, D., Rimjaem, S., Domagala, M., Filo, G., Lisowski, E., Lisowski, F., Michałek, M., Poznański, P., Płazek, J., Korcyl, K., Lebiedowicz, P., Pysz, K., Schäfer, W., Szczurek, A., Firlej, M., Fiutowski, T., Idzik, M., Moron, J., Swientek, K., Terlecki, P., Korcyl, G., Lalik, R., Malige, A., Moskal, P., Nowakowski, K., Przygoda, W., Rathod, N., Salabura, P., Smyrski, J., Augustin, I., Böhm, R., Lehmann, I., Schmitt, L., Varentsov, V., Al-Turany, M., Belias, A., Deppe, H., Dzhygadlo, R., Flemming, H., Gerhardt, A., Götzen, K., Heinz, A., Jiang, P., Karabowicz, R., Koch, S., Kurilla, U., Lehmann, D., Lühning, J., Lynen, U., Orth, H., Peters, K., Pütz, J., Ritman, J., Schepers, G., Schmidt, C. J., Schwarz, C., Schwiening, J., Täschner, A., Traxler, M., Voss, B., Wieczorek, P., Abazov, V., Alexeev, G., Barabanov, M. Yu., Dodokhov, V. Kh., Efremov, A., Fechtchenko, A., Galoyan, A., Golovanov, G., Koshurnikov, E. K., Lobanov, Y. Yu., Olshevskiy, A. G., Piskun, A. A., Samartsev, A., Shimanski, S., Skachkov, N. B., Skachkova, A. N., Strokovsky, E. A., Tokmenin, V., Uzhinsky, V., Verkheev, A., Vodopianov, A., Zhuravlev, N. I., Watts, D., Böhm, M., Eyrich, W., Lehmann, A., Miehling, D., Pfaffinger, M., Seth, K., Xiao, T., Ali, A., Hamdi, A., Himmelreich, M., Krebs, M., Nakhoul, S., Nerling, F., Gianotti, P., Lucherini, V., Bracco, G., Bodenschatz, S., Brinkmann, K. T., Brück, L., Diehl, S., Dormenev, V., Düren, M., Erlen, T., Hahn, C., Hayrapetyan, A., Hofmann, J., Kegel, S., Khalid, F., Köseoglu, I., Kripko, A., Kühn, W., Metag, V., Moritz, M., Nanova, M., Novotny, R., Orsich, P., Pereira-De-Lira, J., Sachs, M., Schmidt, M., Schubert, R., Strickert, M., Wasem, T., Zaunick, H. G., Tomasi-Gustafsson, E., Glazier, D., Ireland, D., Seitz, B., Kappert, R., Kavatsyuk, M., Loehner, H., Messchendorp, J., Rodin, V., Kalita, K., Huang, G., Liu, D., Peng, H., Qi, H., Sun, Y., Zhou, X., Kunze, M., Azizi, K., Olgun, A. T., Tavukoglu, Z., Derichs, A., Dosdall, R., Esmail, W., Gillitzer, A., Goldenbaum, F., Grunwald, D., Jokhovets, L., Kannika, J., Kulessa, P., Orfanitski, S., Perez-Andrade, G., Prasuhn, D., Prencipe, E., Rosenthal, E., Schadmand, S., Schmitz, R., Scholl, A., Sefzick, T., Serdyuk, V., Stockmanns, T., Veretennikov, D., Wintz, P., Wüstner, P., Xu, H., Zhou, Y., Cao, X., Hu, Q., Liang, Y., Rigato, V., Isaksson, L., Achenbach, P., Corell, O., Denig, A., Distler, M., Hoek, M., Lauth, W., Leithoff, H. H., Merkel, H., Müller, U., Petersen, J., Pochodzalla, J., Schlimme, S., Sfienti, C., Thiel, M., Bleser, S., Bölting, M., Capozza, L., Dbeyssi, A., Ehret, A., Klasen, R., Kliemt, R., Maas, F., Motzko, C., Noll, O., Piñeiro, D. Rodríguez, Schupp, F., Steinen, M., Wolff, S., Zimmermann, I., Kazlou, D., Korzhik, M., Missevitch, O., Balanutsa, P., Chernetsky, V., Demekhin, A., Dolgolenko, A., Fedorets, P., Gerasimov, A., Golubev, A., Kantsyrev, A., Kirin, D. Y., Kristi, N., Ladygina, E., Luschevskaya, E., Matveev, V. A., Panjushkin, V., Stavinskiy, A. V., Balashoff, A., Boukharov, A., Bukharova, M., Malyshev, O., Vishnevsky, E., Bonaventura, D., Brand, P., Hetz, B., Hüsken, N., Kellers, J., Khoukaz, A., Klostermann, D., Mannweiler, C., Vestrick, S., Bumrungkoh, D., Herold, C., Khosonthongkee, K., Kobdaj, C., Limphirat, A., Manasatitpong, K., Nasawad, T., Pongampai, S., Simantathammakul, T., Srisawad, P., Wongprachanukul, N., Yan, Y., Yu, C., Zhang, X., Zhu, W., Antokhin, E., Barnyakov, A. Yu., Beloborodov, K., Blinov, V. E., Kuyanov, I. A., Pivovarov, S., Pyata, E., Tikhonov, Y., Blinov, A. E., Kononov, S., Kravchenko, E. A., Lattery, M., Boca, G., Duda, D., Finger, M., Kveton, A., Prochazka, I., Slunecka, M., Volf, M., Jary, V., Korchak, O., Marcisovsky, M., Neue, G., Novy, J., Tomasek, L., Tomasek, M., Virius, M., Vrba, V., Abramov, V., Bukreeva, S., Chernichenko, S., Derevschikov, A., Ferapontov, V., Goncharenko, Y., Levin, A., Maslova, E., Melnik, Y., Meschanin, A., Minaev, N., Mochalov, V., Moiseev, V., Morozov, D., Nogach, L., Poslavskiy, S., Ryazantsev, A., Ryzhikov, S., Semenov, P., Shein, I., Uzunian, A., Vasiliev, A., Yakutin, A., Belostotski, S., Fedotov, G., Izotov, A., Manaenkov, S., Miklukho, O., Cederwall, B., Preston, M., Tegner, P. E., Wölbing, D., Gandhi, K., Rai, A. K., Godre, S., Crede, V., Dobbs, S., Eugenio, P., Bussa, M. P., Spataro, S., Calvo, D., De Remigis, P., Filippi, A., Mazza, G., Wheadon, R., Iazzi, F., Lavagno, A., Akram, A., Calen, H., Andersson, W. Ikegami, Johansson, T., Kupsc, A., Marciniewski, P., Papenbrock, M., Regina, J., Rieger, J., Schönning, K., Wolke, M., Chlopik, A., Kesik, G., Melnychuk, D., Tarasiuk, J., Wojciechowski, M., Wronka, S., Zwieglinski, B., Amsler, C., Bühler, P., Marton, J., Zimmermann, S., Fischer, C. S., Haidenbauer, J., Hanhart, C., Lutz, M. F. M., Ryan, Sinéad M., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and PANDA

Subjects
accelerator, Physics::Instrumentation and Detectors, quantum chromodynamics: nonperturbative, FOS: Physical sciences, hadron, nonperturbative, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], High Energy Physics - Experiment, anti-p p: colliding beams, GSI, High Energy Physics - Experiment (hep-ex), strangeness, nuclear physics, anti-p p: scattering, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], ddc:530, Nuclear Experiment (nucl-ex), Nuclear Experiment, Panda,GSI, new physics, new physics: search for, strong interaction, PANDA, nucleon: structure function, anti-p, atomic physics, beam, proposed experiment, ion, charm
Abstract

The Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, provides unique possibilities for a new generation of hadron-, nuclear- and atomic physics experiments. The future antiProton ANnihilations at DArmstadt (PANDA or $\overline{\rm P}$ANDA) experiment at FAIR will offer a broad physics programme, covering different aspects of the strong interaction. Understanding the latter in the non-perturbative regime remains one of the greatest challenges in contemporary physics. The antiproton-nucleon interaction studied with PANDA provides crucial tests in this area. Furthermore, the high-intensity, low-energy domain of PANDA allows for searches for physics beyond the Standard Model, e.g. through high precision symmetry tests. This paper takes into account a staged approach for the detector setup and for the delivered luminosity from the accelerator. The available detector setup at the time of the delivery of the first antiproton beams in the HESR storage ring is referred to as the \textit{Phase One} setup. The physics programme that is achievable during Phase One is outlined in this paper., Comment: 35 pages, 15 figures

Published
2021
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43. Kaon electroproduction on the proton

Author

M. V. Egorov and V. I. Postnikov

Subjects
Physics, Proton, Unitarity, Nuclear Theory, Hadron, Momentum transfer, General Physics and Astronomy, Resonance, Strangeness, Nuclear physics, Momentum, Amplitude, фоторождение, каоны, High Energy Physics::Experiment, протоны, Nuclear Experiment
Abstract

A model of kaon photoproduction in the p(e, e′K+)Λ, p(e, e′K+)Σ0, and p(e, e′K0)Σ+ processes with the square of the momentum transfer Q2 up to 2.5 GeV2 is proposed. The photoproduction amplitude includes the s-, t-, and u-channel Born and s- and u-channel resonance contributions calculated in the tree approximation. The unitarity of the photoproduction amplitude is partially recovered by introducing the momentum dependence of the hadron decay widths of resonances and an additional effective width taking into account the effect of coupling between open channels without strangeness. The specificities of the calculations are allowance for the longitudinal electromagnetic coupling of photons to hadrons and the introduction of strongly Q2-dependent suppression factors for the Born and resonance components of the photoproduction amplitude. This approach provides an accurate description of the existing data on the angular and Q2 distributions for the p(e, e′K+)Λ and p(e, e′K+)Σ0 reactions. This model also correctly reproduces the dependence of the ratio σ(Σ0)/σ(Λ) separately for longitudinally and transversely polarized components of the kaon photoproduction cross section in the p(e, e′K+)Λ and p(e, e′K+)Σ0 processes.

Published
2021

46. NA57 Results.

Author

Antinori, F., Bacon, P., Badalà, A., Barbera, R., Belogianni, A., Bloodworth, I., Bombara, M., Bruno, G. E., Bull, S. A., Caliandro, R., Campbell, M., Carena, W., Carrer, N., Clarke, R. F., Dainese, A., Di Bari, D., Di Liberto, S., Divià, R., Elia, D., and Evans, D.

Subjects
*HYPERONS, *HEAVY ions, *HEAVY ion collisions, *PARTICLES (Nuclear physics), *RELATIVISTIC particles, *NUCLEAR physics
Abstract

Hyperon enhancements at 160 and 40 A Gev/c are presented and compared. The momentum spectra are analysed in the framework of the blast wave model and freeze-out temperature, transverse and longitudinal flows are extracted. Nuclear modification factors are presented and discussed. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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47. Λ and Ks0 Production in pC Collisions at 10 GeV/c.

Author

Aslanyan, P. Zh.

Subjects
*COLLISIONS (Nuclear physics), *BUBBLE chambers, *NUCLEAR energy, *NUCLEAR physics, *FORCE & energy
Abstract

The experimental data from the 2 m propane bubble chamber have been analyzed for pC→ Λ(Ks0)X reactions at 10 GeV/c. The estimation of experimental inclusive cross sections for Lgr; and Ks0 production in the p12C collision is equal to σΛ= 13.3±1.7 mb and σKs0= 3.8±0.6 mb, respectively. The measured Λ/π+ ratio from pC reactions is equal to (5.3±0.8) * 10-2. The experimental Λ/π+ ratio in the pC reaction is approximately two times larger than the Λ/π+ ratio from pp reactions. There is a significant enhancement specially in the Λ/π+ ratio for p+C and C+C collisions at 10 A·GeV/c. The investigation has been performed at the Veksler and Baldin Laboratory of High Energies, JINR. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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48. Formation of light nuclei at chemical freezeout: Description within a statistical thermal model

Author

Deeptak Biswas

Subjects
Physics, education.field_of_study, Nuclear Theory, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, Population, FOS: Physical sciences, Context (language use), Strangeness, Lambda, 01 natural sciences, Nuclear Theory (nucl-th), Nuclear physics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Phase space, 0103 physical sciences, Thermal, High Energy Physics::Experiment, Thermal model, Nuclear Experiment, 010306 general physics, education
Abstract

The thermal description of light nuclei at the chemical freeze-out has been investigated. First, I have verified the equilibration of the light nuclei and then introduced a new method to investigate the light nuclei formation. One can study the proximity between the phase space density of light nuclei ratios and their hadronic constituents e.g $\bar{d}/d$ and $(\bar{p}\bar{n}/pn)$. I have found that with the exclusion of the decay feed-down from the hadronic yields in the thermal model, the hadronic representations have good agreement with the light nuclei ratios. I have performed a similar analysis with the ratio of $\Lambda$-hypernuclei and $^3 He$, which is related to the ratio $\Lambda/p$. In this context, the strangeness population factor $S_3$ has been studied also. These results indicate that the nuclei and hypernuclei formation may occur near the standard chemical freeze-out and before the decay of the hadronic resonances. This method will serve as a guideline to discuss the light nuclei formation and the inclusion of decay into their hadronic constituents., Comment: Title has been modified, version published in PRC

Published
2020
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49. Hadronic Resonance Gas Model and Multiplicity Dependence in p-p, p-Pb, Pb-Pb collisions: Strangeness Enhancement

Author

Jean Willy Andre Cleymans, Pok Man Lo, K. Redlich, and Natasha Sharma

Subjects
Physics, Large Hadron Collider, Hadron, Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, hep-ph, Multiplicity (mathematics), Strangeness, Resonance (particle physics), Nuclear physics, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Pion, Thermal, Particle, Nuclear Experiment, Particle Physics - Phenomenology
Abstract

Recently the ALICE collaboration has observed an interesting systematic behaviour of ratios of identified particles to pions yields at the LHC, showing that they depend solely on the charged-particle multiplicity in pp, pPb and PbPb collisions. In particular, the yields of (multi)strange particles relative to pions, increases with multiplicity and the enhancement is mode pronounced with increasing strangeness content. We will argue, that such a pattern of arises naturally in the thermal model taking into account exact strangeness conservation. Furthermore, extending the thermal model by including hadron interactions within the S-matrix approach, the ALICE data can be well quantified by the thermal particle yields at the chiral-crossover temperature, as previously found in central Pb-Pb collisions., 10 pages, 3 figures

Published
2020

50. Probing chemical freeze-out criteria in relativistic nuclear collisions with coarse grained transport simulations

Author

Gabriele Inghirami, Marcus Bleicher, and Tom Reichert

Subjects
Nuclear and High Energy Physics, Nuclear Theory, Hadron, FOS: Physical sciences, hiukkasfysiikka, Strangeness, Inelastic scattering, 01 natural sciences, Nuclear Theory (nucl-th), Nuclear physics, High Energy Physics - Phenomenology (hep-ph), Pion, 0103 physical sciences, ddc:530, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Baryon, High Energy Physics - Phenomenology, Quark–gluon plasma, relativistic nuclear collisions, High Energy Physics::Experiment, ydinfysiikka, Energy (signal processing), Lepton
Abstract

We introduce a novel approach based on elastic and inelastic scattering rates to extract the hyper-surface of the chemical freeze-out from a hadronic transport model in the energy range from E$_\mathrm{lab}=1.23$ AGeV to $\sqrt{s_\mathrm{NN}}=62.4$ GeV. For this study, the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model combined with a coarse-graining method is employed. The chemical freeze-out distribution is reconstructed from the pions through several decay and re-formation chains involving resonances and taking into account inelastic, pseudo-elastic and string excitation reactions. The extracted average temperature and baryon chemical potential are then compared to statistical model analysis. Finally we investigate various freeze-out criteria suggested in the literature. We confirm within this microscopic dynamical simulation, that the chemical freeze-out at all energies coincides with $\langle E\rangle/\langle N\rangle\approx1$ GeV, while other criteria, like $s/T^3=7$ and $n_\mathrm{B}+n_\mathrm{\bar{B}}\approx0.12$ fm$^{-3}$ are limited to higher collision energies., 9 pages, 10 figures

Published
2020
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