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

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 $\text{J}/\psi $ is considered, where the $\text{J}/\psi $ mesons are reconstructed in the dielectron decay channel at mid-rapidity down to transverse momenta of 1.3 GeV/c. The $\text{b}\overline{\text{b}}$ production cross section at mid-rapidity, $\text{d}{\sigma }_{\text{b}\overline{\text{b}}}/\text{d}y$ , and the total cross section extrapolated over full phase space, ${\sigma }_{\text{b}\overline{\text{b}}}$ , are obtained. This measurement is combined with results on inclusive $\text{J}/\psi $ production to determine the prompt $\text{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 ${p}_{T}$ for both $\text{J}/\psi $ coming from beauty hadron decays and prompt $\text{J}/\psi $ .