Heavy Ion Tea

Full jet tomography of high-energy nucleus-nucleus collisions
Dr. Benwei Zhang (LANL)

Abstract: While strong attenuation of single particle production and particle correlations has provided convincing evidence for large parton energy loss in the QGP, its application to jet tomography has inherent limitations due to the inclusive nature of the measurements. Generalization of this suppression to full jet observables leads to an unbiased, more differential and thus powerful approach to determining the characteristics of the hot QCD medium created in high-energy nuclear collisions. In this talk I report on recent theoretical progress in studying full jet observables in the presence of QGP-induced parton energy loss. (i) A theoretical model of intra-jet energy flow in heavy-ion collisions is discussed. (ii) Realistic numerical simulations demonstrate the nuclear modification factor for jets evolves continuously with the jet size or the acceptance cut - a novel feature of jet quenching; the anticipated broadening of jet shapes is subtle and most readily manifested in the periphery of the cone for smaller cone radii. (iii) A NLO pQCD calculation of jets production at relativistic heavy-ion collisions is presented.