Generalized quark number susceptibilities from fugacity expansion at finite chemical potential for $N_f$ = 2 Wilson fermions

Abstract

Generalized susceptibilities of the net quark number have been proposed to be good probes for the transitions in the QCD phase diagram and for the search of a possible critical end point. In this article we explore a new strategy for computing quark number susceptibilities from lattice QCD via an expansion in the fugacity parameter $e^{\mu \beta }$. All quark number related bulk observables are particularly easy to access in this approach and we present results for generalized quark number susceptibilities up to 4-th order. Ratios of these quantities are studied and compared with model calculations for the high- and low temperature regions up to a chemical potential of $\mu \beta \approx 1.0$.

References, comments and two plots added: Fig. 1 now contains a second plot with logarithmic scale and we added a new Fig. 7 showing our results for the QCD phase diagram. Final version to appear in Phys. Rev. D

References in corpus (6)

• Freeze-out parameters from electric charge and baryon number fluctuations: is there consistency?
• Finite density QCD with a canonical approach
• QCD at non-zero density and canonical partition functions with Wilson fermions
• Wilson Fermion Determinant in Lattice QCD
• Winding expansion techniques for lattice QCD with chemical potential
• Distribution of Canonical Determinants in QCD

Cited by in corpus (3)

• Repulsive baryonic interactions and lattice QCD observables at imaginary chemical potential
• Reliable estimation of the radius of convergence in finite density QCD
• Search of QCD phase transition points in the canonical approach of the NJL model