A Dynamical Scaling Law for Jet Tomography

Abstract

Medium modifications of parton fragmentation provide a novel tomographic tool for the study of the hot and dense matter created in ultrarelativistic nucleus-nucleus collisions. Their quantitative analysis, however, is complicated by the strong dynamical expansion of the collision region. Here, we establish for the multiple scattering induced gluon radiation spectrum a scaling law which relates medium effects in a collision of arbitrary dynamical expansion to that in an equivalent static scenario. Based on this scaling, we calculate for typical kinematical values of the RHIC and LHC heavy ion programs medium-modified parton fragmentation functions for heavy ion collisions with realistic dynamical expansion.

4 pages, Latex, 3 eps-figures

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• High $p_T$ Azimuthal Asymmetry in Non-central A+A at RHIC
• Quenching of hadron spectra in media
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