12-18 August 2012
US/Eastern timezone

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Study of jet quenching using photon-jet events in PbPb collisions at 2.76 TeV with CMS

14 Aug 2012, 14:15
20m
Palladian ()

Palladian

Oral Presentation Jets Parallel 1B, Jets (Chair X.N. Wang)

Speaker

Yue Shi Lai (Massachusetts Inst. of Technology (US))

Description

The first measurement of the transverse momentum (pT) imbalance of isolated-photon+jet pairs in relativistic heavy ion collisions is reported. The analysis uses data from PbPb collisions at a center-of-mass energy of 2.76 TeV per nucleon pair and corresponding to an integrated luminosity of 150/ub recorded by the CMS experiment at the LHC in 2011. For events containing an isolated photon with transverse momentum pT > 60 GeV/c and an associated jet with pT > 30 GeV/c, the photon–jet pT imbalance is studied as a function of collision centrality and compared to pp data and PYTHIA calculations at the same center-of-mass energy. Using the pT of the isolated photon as an estimate of the energy of the associated parton at production, this measurement allows an unbiased characterization of the in-medium parton energy loss.

Primary author

Presentation Materials

Paper