TY - JOUR
T1 - 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
AU - Aad...[et al.], G.
AU - Dam, Mogens
AU - Hansen, John Renner
AU - Hansen, Jørgen Beck
AU - Hansen, Jørn Dines
AU - Hansen, Peter Henrik
AU - Jørgensen, Morten Dam
AU - Klinkby, Esben Bryndt
AU - Xella, Stefania
PY - 2010/12/13
Y1 - 2010/12/13
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevLett.105.252303
DO - 10.1103/PhysRevLett.105.252303
M3 - Journal article
VL - 105
SP - 252303
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 25
ER -