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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 |
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| Authors: | Aad G Abbott B Abdallah J Abdelalim A A Abdesselam A Abdinov O Abi B Abolins M Abramowicz H Abreu H Acerbi E Acharya B S Ackers M Adams D L Addy T N Adelman J Aderholz M Adomeit S Adragna P Adye T Aefsky S Aguilar-Saavedra J A Aharrouche M Ahlen S P Ahles F Ahmad A Ahsan M Aielli G Akdogan T Akesson T P A Akimoto G Akimov A V Alam M S Alam M A Albrand S Aleksa M Aleksandrov I N Aleppo M Alessandria F Alexa C Alexander G Alexandre G Alexopoulos T Alhroob M Aliev M Alimonti G Alison J Aliyev M Allport P P Allwood-Spiers S E Almond J Aloisio A Alon R Alonso A Alonso J Alviggi M G Amako K |
| Affiliation: | Albert-Ludwigs-Universit?t, Fakult?t für Mathematik und Physik, Hermann-Herder Strasse 3, D-79104 Freiburg i.Br., Germany. |
| 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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