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Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at root s(NN)=2.76 TeV with the ATLAS Detector at the LHC
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
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2010 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 105, no 25, 252303- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2010. Vol. 105, no 25, 252303- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-31943DOI: 10.1103/PhysRevLett.105.252303ISI: 000286750400009Scopus ID: 2-s2.0-78650402517OAI: oai:DiVA.org:kth-31943DiVA: diva2:407262
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note
QC 20110330Available from: 2011-03-30 Created: 2011-03-30 Last updated: 2017-12-11Bibliographically approved

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Strandberg, Jonas

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