Net-baryon number fluctuations

Abstract

The appearance of large, none-Gaussian cumulants of the baryon number distribution is commonly discussed as a signal for the QCD critical point. We review the status of the Taylor expansion of cumulant ratios of baryon number fluctuations along the freeze-out line and also compare QCD results with the corresponding proton number fluctuations as measured by the STAR Collaboration at RHIC. To further constrain the location of a possible QCD critical point we discuss poles of the baryon number fluctuations in the complex plane. Here we use not only the Taylor coefficients obtained at zero chemical potential but perform also calculations of Taylor expansion coefficients of the pressure at purely imaginary chemical potentials.

10 pages, 5 figures, talk presented at the Workshop "Criticality in QCD and the Hadron Resonance Gas", 29-31 July 2020, Online

References in corpus (4)

• Cluster Expansion Model for QCD Baryon Number Fluctuations: No Phase Transition at ${\mu }_B/T<\pi$
• Universal location of the Yang-Lee edge singularity in O(N) theories
• Fourier coefficients of the net-baryon number density and chiral criticality
• Measurement of cumulants of conserved charge multiplicity distributions in Au+Au collisions from the STAR experiment

Cited by in corpus (8)

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• Status and initial physics performance studies of the MPD experiment at NICA
• Lattice QCD Equation of State for Nonvanishing Chemical Potential by Resumming Taylor Expansion
• Analytical structure of the equation of state at finite density: Resummation versus expansion in a low energy model
• Towards the chiral phase transition in the Roberge-Weiss plane
• Contribution to understanding the phase structure of strong interaction matter: Lee-Yang edge singularities from lattice QCD
• Settling an old story: solution of the Thirring model in thimble regularization
• Lee-Yang edge singularities in lattice QCD : A systematic study of singularities in the complex ${\mu }_B$ plane using rational approximations