Net-particle number fluctuations in a hydrodynamic description of heavy-ion collisions


We generalize the Cooper-Frye particlization routine to make it suitable for describing event-by-event fluctuations in heavy-ion collisions. This is achieved via a newly developed subensemble method, allowing to incorporate the effects of exact global conservation of multiple charges, thermal smearing, and resonance decays on fluctuations of various particle numbers. Utilizing viscous hydrodynamic simulations of heavy-ion collisions, we study the behavior of cumulants of net-proton, net-Lambda, net-pion and net-kaon distributions at RHIC and LHC energies. The experimental data on net-proton cumulants at sNN>20 GeV are consistent with simultaneous effects of global baryon conservation and repulsive interactions in baryon sector, the latter being in line with the behavior of baryon number susceptibilities observed in lattice QCD. The data at lower collision energies show possible indications for sizable attractive interactions among baryons.

May 18, 2021 11:10 — 11:30
Brookhaven National Laboratory, Upton, USA
Volodymyr Vovchenko
Theoretical Physicist

My research interests include heavy-ion collisions, hot and dense QCD matter equation of state, and scientific computing