Observation and studies of jet quenching in PbPb collisions at {radical}(s{sub NN})=2.76 TeV

Journal Article · Mon Aug 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.84.024906· OSTI ID:21596687

Chatrchyan, S; Khachatryan, V; Sirunyan, A M; Tumasyan, A ^[1]; Adam, W; Bergauer, T; Dragicevic, M; Eroe, J; Fabjan, C; Friedl, M; Fruehwirth, R; Ghete, V M; Hammer, J; Haensel, S; Hartl, C; Hoch, M; Hoermann, N; Hrubec, J; Jeitler, M; Kasieczka, G ^[2]

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1. Yerevan Physics Institute, Yerevan (Armenia)
2. Institut fuer Hochenergiephysik der OeAW, Wien (Austria)

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 {mu}b{sup -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 p{sub T}=120 GeV/c) up to the statistical limit of the available data sample (jet p{sub T}{approx_equal}210 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.

• OSTI ID: 21596687
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 84, Issue 2; Other Information: DOI: 10.1103/PhysRevC.84.024906; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

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CORRELATIONS
FRAGMENTATION
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ELECTRICAL EQUIPMENT
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MEASURING INSTRUMENTS
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