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

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 {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.

Authors:
; ; ;  [1]; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [2]
  1. Yerevan Physics Institute, Yerevan (Armenia)
  2. Institut fuer Hochenergiephysik der OeAW, Wien (Austria)
Publication Date:
OSTI Identifier:
21596687
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevC.84.024906; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ATOM-ATOM COLLISIONS; CALORIMETERS; CENTER-OF-MASS SYSTEM; CERN LHC; CHARGED PARTICLES; COLLISIONS; CORRELATIONS; FRAGMENTATION; LEAD; LUMINOSITY; MUONS; NUCLEONS; SOLENOIDS; TEV RANGE 01-10; TRANSVERSE MOMENTUM; ACCELERATORS; ATOM COLLISIONS; BARYONS; CYCLIC ACCELERATORS; ELECTRIC COILS; ELECTRICAL EQUIPMENT; ELEMENTARY PARTICLES; ELEMENTS; ENERGY RANGE; EQUIPMENT; FERMIONS; HADRONS; LEPTONS; LINEAR MOMENTUM; MEASURING INSTRUMENTS; METALS; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; STORAGE RINGS; SYNCHROTRONS; TEV RANGE

Citation Formats

Chatrchyan, S, Khachatryan, V, Sirunyan, A M, Tumasyan, A, 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, and Kasieczka, G. Observation and studies of jet quenching in PbPb collisions at {radical}(s{sub NN})=2.76 TeV. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.84.024906.
Chatrchyan, S, Khachatryan, V, Sirunyan, A M, Tumasyan, A, 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. Observation and studies of jet quenching in PbPb collisions at {radical}(s{sub NN})=2.76 TeV. United States. https://doi.org/10.1103/PHYSREVC.84.024906
Chatrchyan, S, Khachatryan, V, Sirunyan, A M, Tumasyan, A, 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, and Kasieczka, G. 2011. "Observation and studies of jet quenching in PbPb collisions at {radical}(s{sub NN})=2.76 TeV". United States. https://doi.org/10.1103/PHYSREVC.84.024906.
@article{osti_21596687,
title = {Observation and studies of jet quenching in PbPb collisions at {radical}(s{sub NN})=2.76 TeV},
author = {Chatrchyan, S and Khachatryan, V and Sirunyan, A M and Tumasyan, A and Adam, W and Bergauer, T and Dragicevic, M and Eroe, J and Fabjan, C and Friedl, M and Fruehwirth, R and Ghete, V M and Hammer, J and Haensel, S and Hartl, C and Hoch, M and Hoermann, N and Hrubec, J and Jeitler, M and Kasieczka, G},
abstractNote = {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.},
doi = {10.1103/PHYSREVC.84.024906},
url = {https://www.osti.gov/biblio/21596687}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 2,
volume = 84,
place = {United States},
year = {Mon Aug 15 00:00:00 EDT 2011},
month = {Mon Aug 15 00:00:00 EDT 2011}
}