Charm fluctuations in (2+1)-flavor QCD at high temperature

TL;DR

This study investigates charm quark fluctuations and their correlations in high-temperature QCD using lattice simulations, aiming to determine the dissociation temperature of charmed hadrons and compare with hadron resonance gas models.

Contribution

It provides high-statistics lattice QCD results on charm fluctuations and correlations, including projections onto charmed hadron states, with unprecedented lattice sizes and data quality.

Findings

Charm fluctuations are analyzed with high precision.

Correlations with light flavors are projected onto hadron states.

Results are compared with hadron resonance gas model predictions.

Abstract

Using the high statistics datasets of the HotQCD Collaboration, generated with the HISQ (2+1)-flavor action for light and strange quarks, and treating the charm sector in the quenched approximation, we analyze the second and fourth order cumulants of charm fluctuations and the correlations of charm with lighter conserved flavor quantum numbers. We can make use of a factor 100 larger statistics on ${N_\tau =8}$ lattices which never have been used in studies of charm fluctuations. Analyzing correlations of charm fluctuations with baryon number and electric charge fluctuations we can project onto charmed baryon and meson correlations and compare results with quark model extended hadron resonance gas model calculations. We aim at a precise determination of the dissociation temperature of charmed hadrons and will probe the sensitivity of the fluctuations observables to the presence of multiple-charmed baryons.