Study of J/psi production and cold nuclear matter effects in pPb collisions at root S-NN=5 TeV

R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. Anderlini, J. Anderson, R. Andreassen, J. E. AndrewsR. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, Th. Bauer, A. Bay, J. Beddow, F. Bedeschi, Laurence Carson, P. E. L. Clarke, G. A. Cowan, Daniel Craik, S. Eisenhardt, F. Muheim, M. Needham, S. Playfer, LHCb Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

The production of J/psi mesons with rapidity 1.5 <y <4.0 or 5.0 <y <2.5 and transverse momentum PT <14 GeV/e is studied with the LHCb detector in proton-lead collisions at a nucleon-nucleon centre-of-mass energy, root(NN)-N-S = 5 TeV. The J/psi mesons are reconstructed using the dimuon decay mode. The analysis is based on a data sample corresponding to an integrated luminosity of about 1.6 nb-1. For the first time the nuclear modification factor and forward-backward production ratio are determined separately for prompt J/psi mesons and J/psi from b-hadron decays. Clear suppression of prompt J/psi production with respect to proton-proton collisions at large rapidity is observed, while the production of J/psi from b-hadron decays is less suppressed. These results show good agreement with available theoretical predictions. The measurement shows that cold nuclear matter effects are important for interpretations of the related quark-gluon plasma signatures in heavy-ion collisions.

Original languageEnglish
Article number072
Number of pages23
JournalJournal of High Energy Physics
Issue number2
DOIs
Publication statusPublished - 18 Feb 2014

Keywords

  • Relativistic heavy ion physics
  • Quarkonium
  • Heavy quark production
  • Heavy Ions
  • Particle and resonance production
  • J-PSI
  • HADRONIC PRODUCTION
  • DISTRIBUTIONS
  • GLUON
  • SUPPRESSION
  • DECAY
  • TOOL

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