Study of ϒ Production and Cold Nuclear Matter Effects in pPb Collisions at √s[subscript NN] = 5 TeV
Author(s)Counts, Ian Thomas Hunt; Ilten, Philip James; Williams, Michael
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Production of Υ mesons in proton-lead collisions at a nucleon-nucleon centre-of-mass energy √s[subscript NN] = 5 TeV is studied with the LHCb detector. The analysis is based on a data sample corresponding to an integrated luminosity of 1.6 nb[superscript −1]. The Υ mesons of transverse momenta up to 15 GeV/c are reconstructed in the dimuon decay mode. The rapidity coverage in the centre-of-mass system is 1.5 < y < 4.0 (forward region) and −5.0 < y < −2.5 (backward region). The forward-backward production ratio and the nuclear modification factor for Υ (1S) mesons are determined. The data are compatible with the predictions for a suppression of Υ (1S) production with respect to proton-proton collisions in the forward region, and an enhancement in the backward region. The suppression is found to be smaller than in the case of prompt J/ψ mesons.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal of High Energy Physics
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, et al. “Study of ϒ Production and Cold Nuclear Matter Effects in pPb Collisions at √s[subscript NN] = 5 TeV.” J. High Energ. Phys. 2014, no. 7 (July 2014). © CERN, for the benefit of the LHCb Collaboration
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