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Prompt and non-prompt J / ψ production and nuclear modification at mid-rapidity in p–Pb collisions at √sNN=5.02 TeV
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Prompt and non-prompt J / ψ production and nuclear modification at mid-rapidity in p–Pb collisions at √sNN=5.02 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, …
European Physical Journal C, 卷.78(6), 466
06/2018
DOI: https://doi.org/10.1140/epjc/s10052-018-5881-2

摘要

Engineering (miscellaneous) Physics and Astronomy (miscellaneous)
A measurement of beauty hadron production at mid-rapidity in proton-lead collisions at a nucleon–nucleon centre-of-mass energy sNN=5.02 TeV is presented. The semi-inclusive decay channel of beauty hadrons into J / ψ is considered, where the J / ψ mesons are reconstructed in the dielectron decay channel at mid-rapidity down to transverse momenta of 1.3 GeV/c. The b b ¯ production cross section at mid-rapidity, d σ b b ¯ / d y, and the total cross section extrapolated over full phase space, σ b b ¯ , are obtained. This measurement is combined with results on inclusive J / ψ production to determine the prompt J / ψ cross sections. The results in p–Pb collisions are then scaled to expectations from pp collisions at the same centre-of-mass energy to derive the nuclear modification factor R pPb , and compared to models to study possible nuclear modifications of the production induced by cold nuclear matter effects. R pPb is found to be smaller than unity at low p T for both J / ψ coming from beauty hadron decays and prompt J / ψ.

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