Hagedorn bag-like model with a crossover transition meets lattice QCD

Abstract

Thermodynamic functions, the (higher-order) fluctuations and correlations of conserved charges at $μ_B = 0$, and the Fourier coefficients of net-baryon density at imaginary $μ_B$, are considered in the framework of a Hagedorn bag-like model with a crossover transition. The qualitative behavior of these observables is found to be compatible with lattice QCD results. Fair quantitative description of the lattice data is obtained when quasiparticle-type quarks and gluons with non-zero masses are introduced into the bag spectrum. The equation of state of the model exhibits a smooth and wide crossover transition.

42 pages, 13 figures. Appendix added, accepted for publication in Physical Review C