Alladi Ramakrishnan Hall

Chiral condensate in the Hadron Resonance Gas model

Deeptak Biswas

IMSc

The Hadron Resonance Gas (HRG) model successfully describes the low energy phase of the
QCD matter and various observables of the heavy-ion collision, where the representative degrees
of freedom are the hadrons and their higher mass resonances. We shall discuss the chiral
observables related to the 2+1 flavor QCD within a non-interacting HRG description, with
emphasis on the light quark mass-dependent quantities. The mass variation of hadrons has been
incorporated following inputs from Lattice QCD and Chiral Perturbation theory (ChiPT). In the
physical quark mass limit, we have calculated a pseudo-critical temperature 161.2(1.6) MeV
and the curvature coefficient 0.0203(7). This formalism has successfully improved our
previous understanding of chiral transition in a hadronic medium at the limit of vanishing light
quark mass.