Computations of the drag force on a heavy quark moving through a thermal state of strongly coupled N=4 super-Yang-Mills theory have appeared recently. I compare the strength of this effect between N=4 gauge theory and QCD, using the static force between external quarks to normalize the 't Hooft coupling. Comparing N=4 and QCD at fixed energy density then leads to a relaxation time of roughly 2fm/c for charm quarks moving through a quark-gluon plasma at T=250MeV. This estimate should be regarded as preliminary because of the difficulties of comparing two such different theories.
|Physical Review D - Particles, Fields, Gravitation and Cosmology
|Published - Dec 4 2007
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)