Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mi>NN</mml:mi></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>with the ATLAS Detector at the LHC
- G. Aad
- B. Abbott
- J. Abdallah
- A. A. Abdelalim
- A. Abdesselam
- O. Abdinov
- B. Abi
- M. Abolins
- H. Abramowicz
- H. Abreu
- E. Acerbi
- B. S. Acharya
- M. Ackers
- D. L. Adams
- T. N. Addy
- J. Adelman
- M. Aderholz
- S. Adomeit
- P. Adragna
- T. Adye
- S. Aefsky
- J. A. Aguilar–Saavedra
- M. Aharrouche
- S. P. Ahlen
- F. Ahles
- A. Ahmad
- M. Ahsan
- G. Aielli
- T. Akdoğan
- T. P. A. Åkesson
- G. Akimoto
- A. V. Akimov
- M. S. Alam
- M. A. Alam
- S. Albrand
- M. Aleksa
- I. N. Aleksandrov
- M. Aleppo
- F. Alessandria
- C. Alexa
- G. Alexander
- G. Alexandre
- T. Alexopoulos
- M. Alhroob
- M. Aliev
- G. Alimonti
- J. Alison
- M. Aliyev
- P. P. Allport
- S. E. Allwood-Spiers
- J. Almond
- A. Aloisio
- R. Alon
- A. Alonso
- J. Alonso
- M. G. Alviggi
- B. R. Ko
- P. Amaral
- C. Amelung
- V. V. Ammosov
- A. Amorim
- E. Ros
- N. Amram
- C. Anastopoulos
- T. Andeen
- C. F. Anders
- K. J. Anderson
- A. Andreazza
- V. Andrei
- M-L. Andrieux
- X. S. Anduaga
- A. Angerami
- F. Anghinolfi
- N. Anjos
- A. Annovi
- A. Antonaki
- M. Antonelli
- S. Antonelli
- J. Antoš
- F. Anulli
- S. Aoun
- L. Aperio Bella
- R. Apolle
- G. Arabidze
- I. Aracena
- Y. Arai
- A. T. H. Arce
- J. P. Archambault
- S. Arfaoui
- J-F. Arguin
- E. Arık
- M. Arik
- A. J. Armbruster
- K. Arms
- S.R. Armstrong
- O. Arnaez
- C. Arnault
- A. Artamonov
- G. Artoni
- D. Arutinov
- OSO. Smirnova
- DKD. Kar
- OSO. Smirnova
- DKD. Kar
- PJP. Jackson
- FMF. Malek
- PBP. K. Behera
Physical Review Letters · 2010 · American Physical Society
8 views · 0 downloads
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.