Abstract
The jet quenching parameter (q) over cap 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. (q) over cap 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 (q) over cap is increasing with increasing anisotropy. Possible implications for the saturation scale Q(s) in A-A collisions are pointed out.
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