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High Energy Physics - Experiment

arXiv:1011.6182 (hep-ex)
[Submitted on 29 Nov 2010 (v1), last revised 30 Nov 2010 (this version, v2)]

Title:Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at sqrt(S(NN))= 2.76 TeV with the ATLAS Detector at the LHC

Authors:The ATLAS Collaboration
View a PDF of the paper titled Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at sqrt(S(NN))= 2.76 TeV with the ATLAS Detector at the LHC, by The ATLAS Collaboration
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Abstract: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 underlying event is measured and subtracted event-by-event, giving estimates of jet transverse energy above the ambient background. The transverse energies of dijets in opposite hemispheres is 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, and which may point to an interpretation in terms of strong jet energy loss in a hot, dense medium.
Comments: Accepted for publication at Physical Review Letters
Subjects: High Energy Physics - Experiment (hep-ex); Nuclear Experiment (nucl-ex)
Report number: CERN-PH-EP-2010-062
Cite as: arXiv:1011.6182 [hep-ex]
  (or arXiv:1011.6182v2 [hep-ex] for this version)
  https://doi.org/10.48550/arXiv.1011.6182
arXiv-issued DOI via DataCite
Journal reference: Phys.Rev.Lett.105:252303,2010
Related DOI: https://doi.org/10.1103/PhysRevLett.105.252303
DOI(s) linking to related resources

Submission history

From: Atlas Publications [view email]
[v1] Mon, 29 Nov 2010 10:27:23 UTC (2,641 KB)
[v2] Tue, 30 Nov 2010 06:30:23 UTC (2,911 KB)
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