Observation and studies of jet quenching in PbPb collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn></mml:mrow></mml:math>TeV
- S. Chatrchyan
- V. Khachatryan
- A. M. Sirunyan
- A. Tumasyan
- W. Adam
- T. Bergauer
- M. Dragicevic
- J. Erö
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- W. Kiesenhofer
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- I. Mikulec
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- J. Strauss
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- P. Wagner
- W. Waltenberger
- G. Walzel
- E. Widl
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- V. Mossolov
- N. Shumeiko
- J. Suarez Gonzalez
- L. Benucci
- E. A. De Wolf
- X. Janssen
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- W. Van Doninck
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- I. Villella
- O. Charaf
- B. Clerbaux
- G. De Lentdecker
- V. Dero
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- G. H. Hammad
- T. Hreus
- P. Marage
- L. Thomas
- C. Vander Velde
- P. Vanlaer
- J. Wickens
- V. Adler
- S. Costantini
- M. Grünewald
- B. Klein
- A. Marinov
- J. Mccartin
- D. Ryckbosch
- F. Thyssen
- M. Tytgat
- L. Vanelderen
- P. Verwilligen
- S. Walsh
- N. Zaganidis
- S. Başeğmez
- G. Bruno
- J. Caudron
- L. Ceard
- E. Cortina
- C. Delaere
- D. Favart
- A. Giammanco
- G. Grégoire
- J. Hollar
- V. Lemaı̂tre
- J. Liao
- O. Militaru
- STS. Tosi
- LML. Mundim
- STS. Tosi
- LML. Mundim
- SNSergio Ferraz Novaes
- PMP. G. Mercadante
- SPSandra S. Padula
Physical Review C · 2011 · American Institute of Physics
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Abstract
Jet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV was studied with the Compact Muon Solenoid (CMS) detector at the LHC, using a data sample corresponding to an integrated luminosity of $6.7\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}$b${}^{\ensuremath{-}1}$. Jets are reconstructed using the energy deposited in the CMS calorimeters and studied as a function of collision centrality. With increasing collision centrality, a striking imbalance in dijet transverse momentum is observed, consistent with jet quenching. The observed effect extends from the lower cutoff used in this study (jet ${p}_{\mathrm{T}}=120$ GeV/c) up to the statistical limit of the available data sample (jet ${p}_{\mathrm{T}}\ensuremath{\approx}210$ GeV/c). Correlations of charged particle tracks with jets indicate that the momentum imbalance is accompanied by a softening of the fragmentation pattern of the second most energetic, away-side jet. The dijet momentum balance is recovered when integrating low transverse momentum particles distributed over a wide angular range relative to the direction of the away-side jet.