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Title

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

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Bell, Paul / Bell, William / Berglund, Frida Elina / Blondel, Alain / Bucci, Francesca / Clark, Allan Geoffrey / Dao, Valerio / Efthymiopoulos, Ilias / Ferrere, Didier / Gadomski, Szymon / Garcia Navarro, Jose Enrique / Gaumer, Olivier / Gonzalez Sevilla, Sergio / Goulette, Marc / Hamilton, Andrew / Leger, Annie / Lister, Alison / Macina-Buono, Daniela / Martin Dit Latour, Bertrand / Mikulec, Bettina / Moneta, Lorenzo / Mora Herrera, Maria Clemencia Rosario / Morone, Maria Cristina / Nektarijevic, Snezana / Orellana, Frédérik / Pasztor, Arpad / Pohl, Martin / Robichaud-Veronneau, Andrée / Rosselet, Laurent / Urquijo, Phillip / Wu, Xin
Published in Physical Review Letters. 2010, vol. 105, no. 05, p. 052303
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.
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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. https://archive-ouverte.unige.ch/unige:41589

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Deposited on : 2014-11-07

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