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
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.
Funding
- National Science Foundation
- U.S. Department of Energy
- Alfred P. Sloan Foundation
- Alexander von Humboldt-Stiftung
- Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
- Eesti Teaduste Akadeemia
- Türkiye Atom Enerjisi Kurumu
- CERN
- Kanton Zürich
- European Commission
- Deutsche Forschungsgemeinschaft
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- National Natural Science Foundation of China
- Research Promotion Foundation
- National Science Council
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Academy of Finland
- Bundesministerium für Bildung und Forschung
- Chinese Academy of Sciences
- Eidgenössische Technische Hochschule Zürich
- Consejo Nacional de Ciencia y Tecnología
- General Secretariat for Research and Technology
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Joint Institute for Nuclear Research
- Nemzeti Kutatási és Technológiai Hivatal
- Ministry of Education, Science and Technology
- A.G. Leventis Foundation
- Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
- Centre National de la Recherche Scientifique
- Ministerio de Ciencia e Innovación
- Universidad Autónoma de San Luis Potosí
- School of Mathematics, Institute for Research in Fundamental Sciences
- Bundesministerium für Wissenschaft und Forschung
- Lietuvos Mokslų Akademija
- Pakistan Atomic Energy Commission
- Istituto Nazionale di Fisica Nucleare
- Board of the Swiss Federal Institutes of Technology
- Science and Technology Facilities Council
- Comisión de Investigaciones Científicas
- Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional
- Institut National de Physique Nucléaire et de Physique des Particules
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