ANGULAR STRUCTURE OF ENERGY-LOSSES OF HARD JET IN DENSE QCD-MATTER

Angular structure of radiative and collisional energy losses of a hard parton jet propagating through dense QCD-matter is investigated. For small angular jet cone sizes, theta(0) less than or similar to 5 degre es, the radiative energy loss is shown to dominate over the collisiona l energy loss due to final state elastic rescattering of the hard proj ectile on thermal particles in the medium. Due to coherent effects, th e radiative energy loss decreases with increasing the angular size the jet. It becomes comparable with the collisional energy loss for theta (0) greater than or similar to 5 degrees - 10 degrees. (C) 1998 Elsevi er Science B.V. All rights reserved.