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

ContributorsATLAS Collaboration
Published inPhysical review letters, vol. 105, no. 05, 052303
Publication date2010
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.

Citation (ISO format)
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. In: Physical review letters, 2010, vol. 105, n° 05, p. 052303. doi: 10.1103/PhysRevLett.105.252303
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Journal ISSN0031-9007
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