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arXiv · 1307.5850

A lattice study of the jet quenching parameter

Marco Panero·Kari Rummukainen·Andreas Schäfer
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Abstract

We present a first-principle computation of the jet quenching parameter, which describes the momentum broadening of a high-energy parton moving through the deconfined state of QCD matter at high temperature. Following an idea originally proposed by Caron-Huot, we explain how one can evaluate the soft contribution to the collision kernel characterizing this real-time phenomenon, analyzing certain gauge-invariant operators in a dimensionally reduced effective theory (electrostatic QCD), which can be studied non-perturbatively via simulations on a Euclidean lattice. Our high-precision numerical computations at two different temperatures indicate that soft contributions to the jet quenching parameter are large. After discussing the systematic uncertainties involved, we present a quantitative estimate for the jet quenching parameter in the temperature range accessible at heavy-ion colliders, and compare it to results from phenomenological models as well as to strong-coupling computations based on the holographic correspondence.

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Marco Panero, Kari Rummukainen, Andreas Schäfer. 2014-05-08. A lattice study of the jet quenching parameter. https://doi.org/10.1103/physrevlett.112.162001

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