Conserved charge fluctuations in a chiral hadronic model including hadrons and quarks

Abstract

In this work the baryon number and strange susceptibility of second and fourth order are presented. The results at zero baryonchemical potential are obtained using a well tested chiral effective model including all known hadron degrees of freedom and additionally implementing quarks and gluons in a PNJL-like approach. Quark and baryon number susceptibilities are sensitive to the fundamental degrees of freedom in the model and signal the shift from massive hadrons to light quarks at the deconfinement transition by a sharp rise at the critical temperature. Furthermore, all susceptibilities are found to be largely suppressed by repulsive vector field interactions of the particles. In the hadronic sector vector repulsion of baryon resonances restrains fluctuations to a large amount and in the quark sector above T c even small vector field interactions of quarks quench all fluctuations unreasonably strong. For this reason, vector field interactions for quarks have to vanish in the deconfinement limit.

Effect of resonance decay on conserved number fluctuations in a hadron resonance gas model

“…The susceptibilities and their ratios in hadronic phase calculated in the HRG model reasonably agrees with the lattice QCD results at lower µ B [12]. Several studies have been performed with the HRG model for the fluctuation of conserved quantities, which are considered as baseline for such measurements [23][24][25][26][27]. Also, similar baseline studies have been performed using independent production model and transport model [28][29][30][31] .…”

Conserved charge fluctuations using the D measure in heavy-ion collisions

“…Further, the susceptibilities and their ratios in the hadronic phase calculated in the HRG model reasonably agree with the lattice QCD calculations at lower µ B values [11]. Several studies have been performed with the HRG model for the fluctuation of conserved quantities, which are considered as a baseline for such measurements [29][30][31][32][33][34][35].…”

Quark matter properties and fluctuations of conserved charges in (2+1)-flavored quark model *

“…In order to understand the various regimes of a QCD phase diagram, many theoretical models have been proposed. Linear sigma model (LSM) [35], non-linear sigma model, and Walecka model [model [36] were the earliest models and were extended later through models like the Nambu-Jona-Lasinio (NJL) model [37]. Different theoretical approaches like the chiral hadronic model [38], hadron resonance gas (HRG) model [39], Polyakovquark-meson (PQM) model [40], Dyson-Schwinger equation framework [41], Nambu-Jona-Lasinio (NJL) model [42], Polyakov NJL (PNJL) model [43], and functional renormalization group (FRG) [40] approach have been used to analyze the fluctuations of conserved charges.…”