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Heavy quark chemical equilibration rate as a transport coefficient

  • D. Bödeker
  • M. Laine
Article

Abstract

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 MeV, an order-of-magnitude estimate for charm yields a rate \(\Gamma_{\text{chem}}^{ - 1} \gtrsim {6}0{{\text{fm}} \left/ {\text{c}} \right.}\) 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.

Keywords

Thermal Field Theory Quark-Gluon Plasma Heavy Quark Physics 

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Copyright information

© SISSA, Trieste, Italy 2012

Authors and Affiliations

  1. 1.Faculty of PhysicsUniversity of BielefeldBielefeldGermany
  2. 2.Institute for Theoretical Physics, Albert Einstein CenterUniversity of BernBernSwitzerland

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