ϕ -Meson production at forward rapidity in p–Pb collisions at √sNN = 5.02 TeV and in pp collisions at √s = 2.76 TeV

J. Adam, D. Alexandre, L.S. Barnby, K.L. Graham, P.G. Jones, A. Jusko, M. Krivda, G.R. Lee, R. Lietava, O. Villalobos Baillie, N. Zardoshti, David Evans

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Abstract

Abstract The first study of ϕ-meson production in p–Pb collisions at forward and backward rapidity, at a nucleon–nucleon centre-of-mass energy s NN = 5.02  TeV , has been performed with the ALICE apparatus at the LHC. The ϕ-mesons have been identified in the dimuon decay channel in the transverse momentum ( p T ) range 1 < p T < 7  GeV / c , both in the p-going ( 2.03 < y < 3.53 ) and the Pb-going ( − 4.46 < y < − 2.96 ) directions — where y stands for the rapidity in the nucleon–nucleon centre-of-mass — the integrated luminosity amounting to 5.01 ± 0.19  nb − 1 and 5.81 ± 0.20  nb − 1 , respectively, for the two data samples. Differential cross sections as a function of transverse momentum and rapidity are presented. The forward–backward ratio for ϕ-meson production is measured for 2.96 < | y | < 3.53 , resulting in a ratio ∼0.5 with no significant p T dependence within the uncertainties. The p T dependence of the ϕ nuclear modification factor R pPb exhibits an enhancement up to a factor 1.6 at p T = 3 – 4   GeV / c in the Pb-going direction. The p T dependence of the ϕ-meson cross section in pp collisions at s = 2.76  TeV , which is used to determine a reference for the p–Pb results, is also presented here for 1 < p T < 5  GeV / c and 2.5 < y < 4 , for a 78 ± 3  nb − 1 integrated luminosity sample.
Original languageEnglish
Pages (from-to)203-217
Number of pages15
JournalPhysics Letters B
Volume768
Early online date16 Feb 2017
DOIs
Publication statusPublished - 10 May 2017

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