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J/ψ suppression at forward rapidity in Pb–Pb collisions at sNN=5.02�TeV
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J/ψ suppression at forward rapidity in Pb–Pb collisions at sNN=5.02�TeV

J. Adam, D. Adamov�, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S. Ahmad, S.U. Ahn, S. Aiola, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.766, 頁碼.212-224
03/2017
DOI: https://doi.org/10.1016/j.physletb.2016.12.064

摘要

Nuclear and High Energy Physics
The inclusive J/ψ production has been studied in Pb–Pb and pp collisions at the centre-of-mass energy per nucleon pair s <sub>NN</sub> =5.02�TeV, using the ALICE detector at the CERN LHC. The J/ψ meson is reconstructed, in the centre-of-mass rapidity interval 2.5>y<4 and in the transverse-momentum range p <sub>T</sub> <12�GeV/c, via its decay to a muon pair. In this Letter, we present results on the inclusive J/ψ cross section in pp collisions at s=5.02�TeV and on the nuclear modification factor R <sub>AA</sub> . The latter is presented as a function of the centrality of the collision and, for central collisions, as a function of the transverse momentum p <sub>T</sub> of the J/ψ. The measured R <sub>AA</sub> values indicate a suppression of the J/ψ in nuclear collisions and are then compared to our previous results obtained in Pb–Pb collisions at s <sub>NN</sub> =2.76�TeV. The ratio of the R <sub>AA</sub> values at the two energies is also computed and compared to calculations of statistical and dynamical models. The numerical value of the ratio for central events (0–10% centrality) is 1.17�0.04(stat)�0.20(syst). In central events, as a function of p <sub>T</sub> , a slight increase of R <sub>AA</sub> with collision energy is visible in the region 2<p <sub>T</sub> <6�GeV/c. Theoretical calculations qualitatively describe the measurements, within uncertainties.

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