Chatrchyan, S. ; Mondal, N. K. ; et, al (2011) Observation and studies of jet quenching in PbPb collisions at √SNN=2.76 TeV Physical Review C, 84 (2). 024906 _1-024906 _26. ISSN 0556-2813
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Official URL: http://prc.aps.org/abstract/PRC/v84/i2/e024906
Related URL: http://dx.doi.org/10.1103/PhysRevC.84.024906
Abstract
Jet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV was studied with the Compact Muon Solenoid (CMS) detector at the LHC, using a data sample corresponding to an integrated luminosity of 6.7 μb−1. Jets are reconstructed using the energy deposited in the CMS calorimeters and studied as a function of collision centrality. With increasing collision centrality, a striking imbalance in dijet transverse momentum is observed, consistent with jet quenching. The observed effect extends from the lower cutoff used in this study (jet pT=120 GeV/c) up to the statistical limit of the available data sample (jet pT≈120 GeV/c). Correlations of charged particle tracks with jets indicate that the momentum imbalance is accompanied by a softening of the fragmentation pattern of the second most energetic, away-side jet. The dijet momentum balance is recovered when integrating low transverse momentum particles distributed over a wide angular range relative to the direction of the away-side jet.
Item Type: | Article |
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Source: | Copyright of this article belongs to The American Physical Society. |
ID Code: | 76196 |
Deposited On: | 31 Dec 2011 08:24 |
Last Modified: | 31 Dec 2011 08:24 |
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