Study of J/ψ production and cold nuclear matter effects in pPb collisions at √s[subscript NN] = 5 TeV
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The production of J/ψ mesons with rapidity 1.5 < y < 4.0 or −5.0 < y < −2.5 and transverse momentum p [subscript T] < 14 GeV/c is studied with the LHCb detector in proton-lead collisions at a nucleon-nucleon centre-of-mass energy √sNN = 5TeV. The J/ψ 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[superscript −1]. For the first time the nuclear modification factor and forward-backward production ratio are determined separately for prompt J/ψ mesons and J/ψ from b-hadron decays. Clear suppression of prompt J/ψ production with respect to proton-proton collisions at large rapidity is observed, while the production of J/ψ 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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Journal of High Energy Physics
Aaij, R., B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. “Study of J/ψ Production and Cold Nuclear Matter Effects in pPb Collisions at √s[subscript NN] = 5 TeV.” J. High Energ. Phys. 2014, no. 2 (February 2014). © CERN, for the benefit of the LHCb Collaboration
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