31 July 2023 to 4 August 2023
America/Chicago timezone

Degrees of freedom in various charm subsectors from Lattice QCD

1 Aug 2023, 16:40
20m
Sunrise (WH11NE)

Sunrise

WH11NE

Speaker

Sipaz Sharma (University of Bielefeld)

Description

We establish that the charmed hadrons start dissociating at the chiral crossover temperature, $\mathrm{T_{pc}}$, 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 ($\mathrm{C}$) fluctuations, and their correlations with baryon number ($\mathrm{B}$), electric charge ($\mathrm{Q}$) and strangeness ($\mathrm{S}$) fluctuations. First-time calculation of the $\mathrm{QC}$ correlations on the high statistics ($\mathrm{N_\tau=8}$) datasets of the HotQCD Collaboration enables us to disentangle the contributions from different electrically-charged charm subsectors at and close to $\mathrm{T_{pc}}$. In particular, we see an enhancement over the PDG expectation in the fractional contribution of the $\mathrm{|Q|}=2$ charm subsector to the total charm partial pressure for $\mathrm{T

For $\mathrm{T_{pc}T_{pc}}$, the $\mathrm{|Q|=2}$ charm subsector is solely composed of baryon-like states. For $\mathrm{240 \text{ MeV}

Topical area QCD at Non-zero Temperature

Primary authors

Dr Christian Schmidt-Sonntag (University of Bielefeld) Frithjof Karsch (Brookhaven National Laboratory) Peter Petreczky (Brookhaven National Lab) Sipaz Sharma (University of Bielefeld)

Presentation materials