ar X iv : h ep - p h / 05 10 02 6 v 1 3 O ct 2 00 5 XIth International Conference on Elastic and Diffractive Scattering
نویسنده
چکیده
Jet quenching has been established as one of the main tools to study the properties of the medium produced in heavy ion collisions. Most of the experimental effort has been, up to now, on the measurements of inclusive particle suppression. This observable suffers, however, of limitations due to different trigger-bias effects. The study of jets (or particle correlations) in a medium is the most promising way out for a better characterization of the medium properties. I will present how these more differential measurements can be used to study not only the density of the medium (the traditional parameter fixed by jet quenching measurements) but also more dynamical quantities as flow fields. One of the more striking observations at RHIC so far is the strong suppression of the yields of particles produced at high transverse momentum in central nucleus-nucleus collisions 1. The most widely accepted interpretation of this phenomenon is in terms of energy loss due to medium-induced gluon radiation 2. The peculiar angular structure of this radiation, affected by formation time effects through LPM suppression, predicts a broadening of the jet-like signals associated to the high-p t particles when compared with the corresponding ones in proton-proton collisions 3,4. Inclusive particles. The evolution of a high-p t parton shower is affected by the medium created in heavy ion collisions. At the leading particle level, the additional energy loss translates into a suppression of the high-p t yields due to the steeply falling perturbative spectrum. The only free parameter describing the medium-induced gluon radiation is the transport coefficientˆq with the meaning of the transverse momentum transferred to the emitted gluon per mean free
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