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Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at [sqrt]sNN=2.76  TeV with the ATLAS Detector at the LHC

Author(s)
Taylor, Frank E.
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Alternative title
Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at √sNN=2.76  TeV with the ATLAS Detector at the LHC
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
By using the ATLAS detector, observations have been made of a centrality-dependent dijet asymmetry in the collisions of lead ions at the Large Hadron Collider. In a sample of lead-lead events with a per-nucleon center of mass energy of 2.76 TeV, selected with a minimum bias trigger, jets are reconstructed in fine-grained, longitudinally segmented electromagnetic and hadronic calorimeters. The transverse energies of dijets in opposite hemispheres are observed to become systematically more unbalanced with increasing event centrality leading to a large number of events which contain highly asymmetric dijets. This is the first observation of an enhancement of events with such large dijet asymmetries, not observed in proton-proton collisions, which may point to an interpretation in terms of strong jet energy loss in a hot, dense medium.
Date issued
2010-12
URI
http://hdl.handle.net/1721.1/62796
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aad, G. et al. (ATLAS Collaboration) "Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at √sNN=2.76  TeV with the ATLAS Detector at the LHC." Phys. Rev. Lett. 105, 252303 (2010) [18 pages] © 2010 CERN, for the ATLAS Collaboration.
Version: Final published version
ISSN
0031-9007

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