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The errant life of a heavy quark in the quark-gluon plasma · Around

2010

The errant life of a heavy quark in the quark-gluon plasma

Meyer, Harvey B.

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In the high-temperature phase of QCD, the heavy quark momentum diffusion constant determines, via a fluctuation-dissipation relation, how fast a heavy quark kinetically equilibrates.

This transport coefficient can be extracted from thermal correlators via a Kubo formula.
We present a lattice calculation of the relevant Euclidean correlators in the gluon plasma, based on a recent formulation of the problem in heavy-quark effective field theory (HQET).
We find a $\approx20%$ enhancement of the Euclidean correlator at maximal time separation as the temperature is lowered from $6T_c$ to $2T_c$, pointing to stronger interactions at lower temperatures.

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