Quark mass thresholds in QCD thermodynamics

Details Quark mass thresholds in QCD thermodynamics Quark mass thresholds in QCD thermodynamics

2006-03-06

arxiv.org/abs/hep-ph/0603048v2

Phys.Rev.D73:085009,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages. v2: minor additions and clarifications; published version

Scientific paper

10.1103/PhysRevD.73.085009

We discuss radiative corrections to how quark mass thresholds are crossed, as a function of the temperature, in basic thermodynamic observables such as the pressure, the energy and entropy densities, and the heat capacity of high temperature QCD. The indication from leading order that the charm quark plays a visible role at surprisingly low temperatures, is confirmed. We also sketch a way to obtain phenomenological estimates relevant for generic expansion rate computations at temperatures between the QCD and electroweak scales, pointing out where improvements over the current knowledge are particularly welcome.

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