Prompt and non-prompt \(\hbox {J}/\psi \) production and nuclear modification at mid-rapidity in p–Pb collisions at \(\mathbf{\sqrt{{ s}_{\text {NN}}}= 5.02}\) TeV

Abstract

A measurement of beauty hadron production at mid-rapidity in proton-lead collisions at a nucleon–nucleon centre-of-mass energy \(\sqrt{s_\text {NN}}=5.02\) TeV is presented. The semi-inclusive decay channel of beauty hadrons into \(\hbox {J}/\psi \) is considered, where the \(\hbox {J}/\psi \) mesons are reconstructed in the dielectron decay channel at mid-rapidity down to transverse momenta of 1.3 GeV/c. The \(\hbox {b}\bar{\hbox {b}}\) production cross section at mid-rapidity, \(\hbox {d}\sigma _{\hbox {b}\bar{\hbox {b}}}/\hbox {d}y\), and the total cross section extrapolated over full phase space, \(\sigma _{\text {b}\bar{\text {b}}}\), are obtained. This measurement is combined with results on inclusive \(\hbox {J}/\psi \) production to determine the prompt \(\hbox {J}/\psi \) 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 \(R_{\text {pPb}}\), and compared to models to study possible nuclear modifications of the production induced by cold nuclear matter effects. \(R_{\text {pPb}}\) is found to be smaller than unity at low \(p_{\mathrm{T}}\) for both \(\hbox {J}/\psi \) coming from beauty hadron decays and prompt \(\hbox {J}/\psi \).

A preprint version of the article is available at ArXiv.

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