Charm degrees of freedom in hot matter from lattice QCD

Abstract

We study the nature of charm degrees of freedom in hot strong interaction matter by performing lattice QCD calculations of the second and fourth-order cumulants of charm fluctuations, and their correlations with net baryon number, electric charge and strangeness fluctuations. We show that below the chiral crossover temperature thermodynamics of charm can be very well understood in terms of charmed hadrons. Above the chiral transition charm quarks show up as new degrees of freedom contributing to the partial charm pressure. However, up to temperatures as high as 175 MeV charmed hadron-like excitations provide a significant contribution to the partial charm pressure.

arXiv comment9 pages, 6 figures. Revision based on referee report

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Cited by in corpus (10)

• Generalized susceptibilities and the properties of charm degrees of freedom across the QCD crossover temperature
• Chiral condensate and the equation of state at nonzero baryon density from the hadron resonance gas model with a repulsive mean field
• Temperature Dependence of Heavy Quark Diffusion from (2+1)-flavor Lattice QCD
• Emergence of New Systematics for Open Charm Production in High Energy Collisions
• In-medium bottomonium properties from lattice NRQCD calculations with extended meson operators
• Deep learning of phase transitions with minimal examples
• Thermodynamics of charmed hadrons across chiral crossover from lattice QCD
• Persistence of charmed hadrons in QGP from lattice QCD
• Confining potential in holographic bottom-up QCD from WKB
• Studying the QCD phase diagram using pressure derivatives from lattice QCD