Aug 12 – 18, 2012
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Di-jet properties in pp at sqrt(s) = 7 TeV and Pb-Pb at sqrt(s_NN) = 2.76 by LHC-ALICE

Aug 16, 2012, 4:00 PM
Regency 1/3 and Ambassador

Regency 1/3 and Ambassador


Tatsuya Chujo (University of Tsukuba (JP))


A di-jet produced by a hard scattering of partons plays a vital role to characterize the properties of hot and dense QCD matter produced in Pb-Pb collisions at LHC. In particular, a di-jet is one of the key probes to look for a medium response due to a strong jet quenching effect, as reported by the CMS and ATLAS collaborations. In this analysis, we used the data collected by the ALICE collaboration, in pp collisions at sqrt(s) = 7 TeV and Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV. Charged and neutral leading jets have been used to study the momentum balance with the recoiling charged jet. The di-jet momentum balance (A_J) in pp at sqrt(s) = 7 TeV as a function of charged particle multiplicity has been measured and is compared with the PYTHIA simulation. We also report the status of an analysis of di-jet measurement in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV to search for a possible medium response by a propagation of high energy jet, which is sensitive to parton energy loss.

Primary author

Collaboration ALICE (CERN, Geneva, Switzerland)


Tatsuya Chujo (University of Tsukuba (JP))

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