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Article
Report number arXiv:1011.6182 ; CERN-PH-EP-2010-062
Title Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at sNN = 2.76 TeV with the ATLAS Detector at the LHC
Related titleObservation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at sqrt(S(NN) ) = 2.76 TeV with the ATLAS Detector at the LHC
Author(s) ATLAS Collaboration  Show all 3042 authors
Publication 2010
Imprint 26 Nov 2010
Number of pages 19
Note Accepted by Phys. Rev. Lett. (25 Nov 2010)
Accepted for publication at Physical Review Letters
In: Phys. Rev. Lett. 105 (2010) 252303
DOI 10.1103/PhysRevLett.105.252303
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords relativistic heavy ion physics
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.
Copyright/License publication: © 2010-2025 CERN (License: CC-BY-3.0)
preprint: © 2010-2025 CERN (License: CC-BY-3.0)



Corresponding record in: Inspire
Email contact: giuseppe.iacobucci@cern.ch


 Record created 2010-11-26, last modified 2025-02-06


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