Net proton number cumulants from viscous hydro with equation of state including a critical end point
arxiv(2024)
摘要
In the SMASH-CLVisc-hybrid framework, including SMASH for the initial
conditions and the hadronic rescattering stage, and CLVisc for the quark gluon
plasma (QGP) evolution, we investigate net baryon number fluctuations via
considering the equation of state (EoS) with and without a critical end point
(CEP) in the QCD phase transition. Specifically, two distinct QCD EoS are
utilized: one with smooth crossover derived from NEOS and another with a
critical end point sourced from the rPNJL model. Our results show that
non-monotonic behavior of κσ^2 is not observed above the collision
energy 7.7 GeV, nor are there explicit differences between the EoS
characterized by crossover and that by CEP. This could be attributed to the
significant deviation of the freeze-out line from the location of CEP. It is
also found that the pure SMASH result of κσ^2 is positive and
close to zero at 3 GeV, which is different from the negative value observed
from STAR.
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