Elastic energy loss and longitudinal straggling of a hard jet

A. Majumder

doi:10.1103/PhysRevC.80.031902

paper

Elastic energy loss and longitudinal straggling of a hard jet

arXiv:0810.4967 · doi:10.1103/PhysRevC.80.031902

Abstract

The elastic energy loss encountered by jets produced in deep-inelastic scattering (DIS) off a large nucleus is studied in the collinear limit. In close analogy to the case of (non-radiative) transverse momentum broadening, which is dependent on the medium transport coefficient $q^$ , a class of medium enhanced higher twist operators which contribute to the non-radiative loss of the forward light-cone momentum of the jet ( $q^{-}$ ) are identified and the leading correction in the limit of asymptotically high $q^{-}$ is isolated. Based on these operator products, a new transport coefficient $e^$ is motivated which quantifies the energy loss per unit length encountered by the hard jet. These operator products are then computed, explicitly, in the case of a similar hard jet traversing a deconfined quark-gluon-plasma (QGP) in the hard-thermal-loop (HTL) approximation. This is followed by an evaluation of sub-leading contributions which are suppressed by the light-cone momentum $q^{-}$ , which yields the longitudinal "straggling" i.e., a slight change in light cone momentum due to the Brownian propagation through a medium with a fluctuating color field.

5 pages, 1 figure, Revtex4

Elastic energy loss and longitudinal straggling of a hard jet

Abstract

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