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      Measurement of jet quenching with I_CP and I_AA,Pythia in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV with ALICE

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          Abstract

          This paper discusses the measurement of I_CP and I_AA,Pythia with ALICE (A Large Ion Collider Experiment). An away-side suppression is found expected from in-medium energy loss. Further, and unexpected, a near-side enhancement is seen which has not been reported by previous experiments at lower energies.

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          Expectations for dihadron correlation measurements at the LHC

          The suppression of high transverse momentum (P_T) inclusive hadron spectra in heavy-ion collisions as compared to the scaled expectation of high P_T hadron production in p-p collisions is the most direct manifestation of the interaction of hard partons with the soft bulk medium produced in heavy-ion collisions which is absent in p-p collisions. Yet the measured nuclear suppression factor R_AA is a very averaged quantity and hence only a limited amount of information about the medium evolution and the nature of the interaction with the medium can be deduced from R_AA. Measurements of hard back-to-back hadron correlations in 200 AGeV Au-Au collisions at RHIC have opened a new window to study the energy loss of partons in a medium in a more differential way and for a different distribution of in-medium pathlengths than in the case of R_AA. In this work, we present an extrapolation of our results for back-to-back yields at RHIC energies to 5.5 TeV Pb-Pb collisions at the CERN LHC. We also discuss differences and similarities between the measurement at RHIC.
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            Author and article information

            Journal
            19 May 2011
            Article
            1105.3901
            72fe1f62-617b-4fed-b764-d592acd81094

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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            Proceedings: Rencontres de Moriond QCD and High Energy Interactions 2011
            nucl-ex

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