Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 7, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP07(2012)130
Keywords
Thermal Field Theory; Quark-Gluon Plasma; Heavy Quark Physics
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Funding
- BMBF under project Heavy Quarks
- U.S. Department of Energy
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Motivated by indications that heavy (charm and bottom) quarks interact strongly at temperatures generated in heavy ion collision experiments, we suggest a non-perturbative definition of a heavy quark chemical equilibration rate as a transport coefficient. Within leading-order perturbation theory (corresponding to 3-loop level), the definition is argued to reduce to an expression obtained from the Boltzmann equation. Around T 400 MAT, an order-of-magnitude estimate for charm yields a rate Gamma(-1)(chem) less than or similar to 60 frn/c which remains too slow to play a practical role in current experiments. However, the rate increases rapidly with T and, due to non-linear effects, also if the initial state contains an overabundance of heavy quarks.
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