Jet quenching and broadening: the transport coefficient $\hat{q}$ in an anisotropic plasma

Abstract

The jet quenching parameter $\hat{q}$ is analyzed for a quark jet propagating in an anisotropic plasma. The momentum anisotropy is calculated at high temperature of the underlying quark-gluon plasma. $\hat{q}$ is explicitly estimated in leading-logarithmic approximation by the broadening of the massless quark interacting via gluon exchange. A plasma instability is present. Strong indications are found that $\hat{q}$ is increasing with increasing anisotropy. Possible implications for the saturation scale $Q_s$ in $A-A$ collisions are pointed out.

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• On the imaginary part of the next-to-leading-order static gluon self-energy in an anisotropic plasma
• Hard loop effective theory of the (anisotropic) quark gluon plasma
• Suppression of the jet quenching parameter near the critical temperature
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