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Charm Degrees of Freedom in Quark Gluon Plasma
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abstract
Lattice QCD studies on fluctuations and correlations of charm quantum number have established that deconfinement of charm degrees of freedom sets in around the chiral crossover temperature, $T_c$, i.e. charm degrees of freedom carrying fractional baryonic charge start to appear. By reexamining those same lattice QCD data we show that, in addition to the contributions from quark-like excitations, the partial pressure of charm degrees of freedom may still contain significant contributions from open-charm meson and baryon-like excitations associated with integral baryonic charges for temperatures up to $1.2~ T_c$. Charm quark-quasiparticles become the dominant degrees of freedom for temperatures $T>1.2~ T_c$.
Forward citations
Cited by 2 Pith papers
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In-medium bottomonium properties from lattice NRQCD calculations with extended meson operators
Bottomonium masses do not shift in the quark-gluon plasma up to 250 MeV, but thermal widths are nonzero and highly sensitive to the assumed spectral function shape.
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Generalized susceptibilities and the properties of charm degrees of freedom across the QCD crossover temperature
Charm fluctuations from lattice QCD match a hadron resonance gas only when quark-model-predicted charmed hadrons are added, and above the crossover a charm-quark-like partial pressure emerges.
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