Quark number susceptibilities at finite chemical potential from fugacity expansion

Abstract

Generalized quark number susceptibilities are expected to be good probes for the phase transitions in QCD and the search of a possible critical point. However, their computation in lattice QCD is plagued by the complex action problem which appears at finite chemical potential mu. In this work we explore the possibilities of an expansion in the fugacity parameter exp(mu beta) which has features that make, in particular quark number related bulk observables easily accessible. We present results at finite chemical potential for generalized susceptibilities up to the 4th order as well as their ratios and compare them to model calculations.

arXiv comment7 pages, 8 figures, talk presented at the 32nd International Symposium on Lattice Field Theory (Lattice 2014), 23 - 28 June, 2014, Columbia University New York, NY

References in corpus (7)

• Fluctuations and Correlations of net baryon number, electric charge, and strangeness: A comparison of lattice QCD results with the hadron resonance gas model
• Hadronic fluctuations at the QCD phase transition
• Freeze-out parameters from electric charge and baryon number fluctuations: is there consistency?
• Interacting hadron resonance gas meets lattice QCD
• Quark number susceptibilities at high temperatures
• Winding expansion techniques for lattice QCD with chemical potential
• Properties of canonical determinants and a test of fugacity expansion for finite density lattice QCD with Wilson fermions