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Inclusive J/ψ production at forward and backward rapidity in p-Pb collisions at √sNN=8.16 TeV
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Inclusive J/ψ production at forward and backward rapidity in p-Pb collisions at √sNN=8.16 TeV

S. Acharya, F.T. Acosta, D. Adamová, J. Adolfsson, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, …
Journal of High Energy Physics, 卷.2018(7), 160
07/2018

摘要

Heavy Ion Experiments Nuclear and High Energy Physics
Inclusive J/ψ production is studied in p-Pb interactions at a centre-of-mass energy per nucleon-nucleon collision sNN=8.16 TeV, using the ALICE detector at the CERN LHC. The J/ψ meson is reconstructed, via its decay to a muon pair, in the centre-of-mass rapidity intervals 2.03 < y <sub>cms</sub> < 3.53 and −4.46 < y <sub>cms</sub> < −2.96, where positive and negative y <sub>cms</sub> refer to the p-going and Pb-going direction, respectively. The transverse momentum coverage is p <sub>T</sub> < 20 GeV/c. In this paper, y <sub>cms</sub> - and p <sub>T</sub> -differential cross sections for inclusive J/ψ production are presented, and the corresponding nuclear modification factors R <sub>pPb</sub> are shown. Forward results show a suppression of the J/ψ yield with respect to pp collisions, concentrated in the region p <sub>T</sub> ≲ 5 GeV/c. At backward rapidity no significant suppression is observed. The results are compared to previous measurements by ALICE in p-Pb collisions at sNN=5.02 TeV and to theoretical calculations. Finally, the ratios R <sub>FB</sub> between forward- and backward-y <sub>cms</sub> R <sub>pPb</sub> values are shown and discussed.[Figure not available: see fulltext.].

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