Journal Article

GSI-2023-00089

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Role of proton-antiproton regeneration in the late stages of heavy-ion collisions

Garcia-Montero, O. (Corresponding author) ; Staudenmaier, J. ; Schäfer, A.GSI* ; Torres-Rincon, J. M. ; Elfner, H.GSI*

2022
APS Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevC.105.064906  doi:10.15120/GSI-2023-00089

Report No.: arxiv:2107.08812

Abstract: We investigate the long-standing question of the effect of proton-antiproton annihilation on the(anti-)proton yield, while respecting detailed balance for the 5-body back-reaction for the first time ina full microscopic description of the late stages of heavy-ion collisions. This is achieved by employinga stochastic collision criterion in a hadronic transport approach (SMASH), which allows to treatarbitrary multi-particle reactions. It is used to account for the regeneration of (anti-)protons via5π → p ̄p. Our results show that a back-reaction happens for a fraction of 15-20% of all annihilations.Within a viscous hybrid approach Au+Au/Pb+Pb collisions from √sN N = 17.3 GeV−5.02 TeV areinvestigated and the quoted fraction is independent of the beam energy or centrality of the collision.Taking the back-reaction into account results in regeneration of half of the (anti-)proton yield thatis lost due to annihilations at midrapidity. We also find that, concerning the multiplicities, treatingthe back-reaction as a chain of 2-body reactions is equivalent to a single 5-to-2 reaction

Note: ISSN 2469-9993 not unique: **2 hits**.A.S.acknowledges support by the Stiftung PolytechnischeGesellschaft Frankfurt am Main as well as the GSI F&Eprogram. Computational resources have been providedby the Center for Scientific Computing (CSC) at theGoethe-University of Frankfurt and the GreenCube atGSI. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license

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Contributing Institute(s):

1. Heiße & Dichte QCD Materie (TES)
2. Helmholtz ForschAkad Hess. f. FAIR, HFHF (FHF)

Research Program(s):

1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)
2. DFG project G:(GEPRIS)315477589 - TRR 211: Stark wechselwirkende Materie unter extremen Bedingungen (315477589) (315477589)
3. SUC-GSI-Frankfurt - Strategic university cooperation GSI-U Frankfurt/M (SUC-GSI-FR) (SUC-GSI-FR)
4. Physics of hot and dense matter - Theory (HFHF project) (I:(DE-Ds200)HFHF-HI-Th) (I:(DE-Ds200)HFHF-HI-Th)

Experiment(s):

1. no experiment theory work (theory)

Appears in the scientific report 2022

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