Charm Fluctuations and Deconfinement

2024/01/02 by Sipaz Sharma, Sharma, Sipaz
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2401.01194

openalex publication_date 2024/01/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We establish that the charmed hadrons start dissociating at the chiral crossover temperature, T_pc, leading to the appearance of charm degrees freedom carrying fractional baryon number. Our method is based on analyzing the second and fourth-order cumulants of charm (C) fluctuations, and their correlations with baryon number (B), electric charge (Q) and strangeness (S) fluctuations. The first-time calculation of the QC correlations on the high statistics datasets of the HotQCD Collaboration enables us to disentangle the contributions from different electrically-charged charm subsectors in the hadronic phase. In particular, we see an enhancement over the PDG expectation in the fractional contribution of the |Q|=2 charm subsector to the total charm partial pressure for T

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• Effect of the charm quark on the QCD chiral phase diagram
• Thermodynamics of heavy-light hadrons
• Generalized susceptibilities and the properties of charm degrees of freedom across the QCD crossover temperature
• The strange degrees of freedom in QCD at high temperature