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ϕ-Meson production at forward rapidity in p–Pb collisions at sNN=5.02 TeV and in pp collisions at s=2.76 TeV
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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. Adamová, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, I. Aimo, S. Aiola, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.768, 頁碼.203-217
05/2017
DOI: https://doi.org/10.1016/j.physletb.2017.01.074

摘要

Nuclear and High Energy Physics
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 <sub>NN</sub> =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 <sub>T</sub> ) range 1<p <sub>T</sub> <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 <sup>−1</sup> and 5.81±0.20 nb <sup>−1</sup> , 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 <sub>T</sub> dependence within the uncertainties. The p <sub>T</sub> dependence of the ϕ nuclear modification factor R <sub>pPb</sub> exhibits an enhancement up to a factor 1.6 at p <sub>T</sub> =3–4 GeV/c in the Pb-going direction. The p <sub>T</sub> 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 <sub>T</sub> <5 GeV/c and 2.5<y<4, for a 78±3 nb <sup>−1</sup> integrated luminosity sample.

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