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Angular Dependence of the Radiative Gluon Spectrum and the Energy Loss of Hard Jets in QCD Media

R. Baier, Yu. L. Dokshitzer, A. H. Mueller, D. Schiff

hep-pharXiv:hep-ph/9907267

Abstract

The induced momentum spectrum of soft gluons radiated from a high energy quark propagating through a QCD medium is derived in the BDMPS formalism. A calorimetric measurement for the medium dependent energy lost by a jet with opening angle θ cone is proposed.The fraction of this energy loss with respect to the integrated one appears to be the relevant observable.It exhibits a universal behaviour in terms of the variable θ2 cone L3 q where L is the size of the medium and q the transport coefficient. Phenomenological implications for the differences between cold and hot QCD matter are discussed.

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