Prompt and non-prompt J/ψ production and nuclear modification at mid-rapidity in p-Pb collisions at √(S_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 √(S_NN) = 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 anti b production cross section at mid-rapidity, dσ_{b anti b}/dy, and the total cross section extrapolated over full phase space, σ_{b anti 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. (orig.)