TY  - JOUR
A1  - Savchuk, Oleh
A1  - Vovchenko, Volodymyr
A1  - Koch, Volker
A1  - Steinheimer, Jan
A1  - Stöcker, Horst
T1  - Constraining baryon annihilation in the hadronic phase of heavy-ion collisions via event-by-event fluctuations
T2  - Physics Letters B
N2  - We point out that the variance of net-baryon distribution normalized by the Skellam distribution baseline, κ2[B−B¯]/〈B+B¯〉, is sensitive to the possible modification of (anti)baryon yields due to BB¯ annihilation in the hadronic phase. The corresponding measurements can thus place stringent limits on the magnitude of the BB¯ annihilation and its inverse reaction. We perform Monte Carlo simulations of the hadronic phase in Pb-Pb collisions at the LHC via the recently developed subensemble sampler + UrQMD afterburner and show that the effect survives in net-proton fluctuations, which are directly accessible experimentally. The available experimental data of the ALICE Collaboration on net-proton fluctuations disfavors a notable suppression of (anti)baryon yields in BB¯ annihilations predicted by the present version of UrQMD if only global baryon conservation is incorporated. On the other hand, the annihilations improve the data description when local baryon conservation is imposed. The two effects can be disentangled by measuring κ2[B+B¯]/〈B+B¯〉, which at the LHC is notably suppressed by annihilations but virtually unaffected by baryon number conservation.
Y1  - 2022
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/78345
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-783458
SN  - 0370-2693
VL  - 827
IS  - 136983
PB  - Elsevier
CY  - Amsterdam
ER  -