Quasi particle model vs lattice QCD thermodynamics: extension to $$N_f=2+1+1$$ flavors and momentum dependent quark masses
Year: 2024
Type: article
Abstract: In the last decade a quasi-particle model (QPM) has supplied the basis for the study of heavy quark (HQ) production in ultra-relativistic collisions, allowing for a phenomenological estimate of the HQ diffusion coefficient $$D_s(T)$$ D s ( T ) . Using the new lattice QCD results for the equation of state (EoS) with 2+1+1 dynamical flavors, we extend the QPM from $$N_f=2+1$$ N f = 2 + 1 to $$N_f=2+1+1$$ N f = 2 + 1 + 1 , where the charm quark is included. Fixing the coupling g ( T ) by a fit to the lQCD energy density $$\epsilon (T)$$ ϵ ( T ) , we evaluate the impact of different temperature parametrizations of charm quark mass on EoS and susceptibilities $$\chi _q(T)$$ χ q ( T ) of light, $$\chi _s(T)$$ χ s ( T ) of strange and $$\chi _c(T)$$ χ c ( T ) of charm quarks, the last favouring a charm quark mass increasing toward $$T_c$$ T c . We also explore the extension of the QPM to a more realistic approach called QPM $$_p$$ p , where quark and gluon masses explicitly depend on their momentum converging to the current quark mass at high momenta, as expected from asymptotic free dynamics. The QPM $$_p$$ p allows for a simultaneous quantitative description not only of the EoS but also of the quark susceptibilities ( $$\chi _q(T)$$ χ q ( T ) , $$\chi _s(T)$$ χ
Source: The European Physical Journal C
Authors: Maria Lucia Sambataro, Vincenzo Greco, Gabriele Parisi, Salvatore Plumari
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Funders: Strong, European Commission
OpenAlex ID: W4402134415