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

Understand

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.