Journal article
Baryon-antibaryon dynamics in relativistic heavy-ion collisions
Authors list: Seifert, E.; Cassing, W.
Publication year: 2018
Journal: Physical Review C
Volume number: 97
Issue number: 4
ISSN: 2469-9985
eISSN: 2469-9993
Open access status: Hybrid
DOI Link: https://doi.org/10.1103/PhysRevC.97.044907
Publisher: American Physical Society
Abstract:
The dynamics of baryon-antibaryon annihilation and reproduction (B (B) over bar <-> 3M) is studied within the Parton-Hadron-String Dynamics (PHSD) transport approach for Pb+Pb and Au+Au collisions as a function of centrality from lower Super Proton Synchrotron (SPS) up to Large Hadron Collider (LHC) energies on the basis of the quark rearrangement model. At Relativistic Heavy-Ion Collider (RHIC) energies we find a small net reduction of baryon-antibaryon (B (B) over bar) pairs while for the LHC energy of root s(NN) = 2.76 TeV a small net enhancement is found relative to calculations without annihilation (and reproduction) channels. Accordingly, the sizable difference between data and statistical calculations in Pb+Pb collisions at root s(NN) = 2.76 TeV for proton and antiproton yields [ALICE Collaboration, B. Abelev et al., Phys. Rev. C 88, 044910 (2013)], where a deviation of 2.7 sigma was claimed by the ALICE Collaboration, should not be attributed to a net antiproton annihilation. This is in line with the observation that no substantial deviation between the data and statistical hadronization model (SHM) calculations is seen for antihyperons, since according to the PHSD analysis the antihyperons should be modified by the same amount as antiprotons. As the PHSD results for particle ratios are in line with the ALICE data (within error bars) this might point towards a deviation from statistical equilibrium in the hadronization (at least for protons and antiprotons). Furthermore, we find that the B (B) over bar <-> 3M reactions are more effective at lower SPS energies where a net suppression for antiprotons and antihyperons up to a factor of 2-2.5 can be extracted from the PHSD calculations for central Au+Au collisions.
Citation Styles
Harvard Citation style: Seifert, E. and Cassing, W. (2018) Baryon-antibaryon dynamics in relativistic heavy-ion collisions, Physical Review C, 97(4), Article 044907. https://doi.org/10.1103/PhysRevC.97.044907
APA Citation style: Seifert, E., & Cassing, W. (2018). Baryon-antibaryon dynamics in relativistic heavy-ion collisions. Physical Review C. 97(4), Article 044907. https://doi.org/10.1103/PhysRevC.97.044907
Keywords
HADRONS; HOT; PB-PB COLLISIONS; QCD; STRANGENESS
