Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-03-21
Phys.Rev.D80:125020,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
Updated version containing an analysis of insufficiencies in previous calculations of momentum broadening in unstable plasmas
Scientific paper
10.1103/PhysRevD.80.125020
The average transverse momentum transfer per unit path length to a fast parton scattering elastically in a perturbative quark-gluon plasma is related to the radiative energy loss of the parton. We first calculate the momentum transfer coefficient $\hat q$ in terms of a classical Langevin problem and then define it quantum-mechanically through scattering matrix element. After treating the well known case of a quark-gluon plasma in equilibrium we consider an off-equilibrium unstable plasma. As a specific example, we treat the two-stream plasma with unstable modes of longitudinal chromoelectric field. In the presence of the instabilities, $\hat q$ is shown to exponentially grow in time.
Majumder Abhijit
Mrowczynski St
Müller Berndt
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