The European Physical Journal C > 2018 > 78 > 6 > 1-17
Prompt and non-prompt $$\hbox {J}/\psi $$ J/ψ production and nuclear modification at mid-rapidity in p–Pb collisions at $$\mathbf{\sqrt{{ s}_{\text {NN}}}= 5.02}$$ sNN=5.02 TeV
Source
Abstract
A measurement of beauty hadron production at mid-rapidity in proton-lead collisions at a nucleon–nucleon centre-of-mass energy $$\sqrt{s_\text {NN}}=5.02$$ sNN=5.02 TeV is presented. The semi-inclusive decay channel of beauty hadrons into $$\hbox {J}/\psi $$ J/ψ is considered, where the $$\hbox {J}/\psi $$ J/ψ mesons are reconstructed in the dielectron decay channel at mid-rapidity down to transverse momenta of 1.3 GeV/c. The $$\hbox {b}\bar{\hbox {b}}$$ bb¯ production cross section at mid-rapidity, $$\hbox {d}\sigma _{\hbox {b}\bar{\hbox {b}}}/\hbox {d}y$$ dσbb¯/dy , and the total cross section extrapolated over full phase space, $$\sigma _{\text {b}\bar{\text {b}}}$$ σbb¯ , are obtained. This measurement is combined with results on inclusive $$\hbox {J}/\psi $$ J/ψ production to determine the prompt $$\hbox {J}/\psi $$ 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 $$R_{\text {pPb}}$$ RpPb , and compared to models to study possible nuclear modifications of the production induced by cold nuclear matter effects. $$R_{\text {pPb}}$$ RpPb is found to be smaller than unity at low $$p_{\mathrm{T}}$$ pT for both $$\hbox {J}/\psi $$ J/ψ coming from beauty hadron decays and prompt $$\hbox {J}/\psi $$ J/ψ .
Identifiers
journal ISSN : | 1434-6044 |
journal e-ISSN : | 1434-6052 |
DOI | 10.1140/epjc/s10052-018-5881-2 |