Measurement of differential J/ψ production cross-sections and forward-backward ratio in p+Pb collisions with the ATLAS detector

الأصل · EN

Measurements of differential cross-sections for J/ψ production in p+Pb collisions at √sNN = 5.02 TeV at the LHC with the ATLAS detector are presented. The data set used corresponds to an integrated luminosity of 28.1 nb⁻¹. The J/ψ mesons are reconstructed in the dimuon decay channel over the transverse momentum range 8<pₜ<30 GeV and over the center-of-mass rapidity range -2.87<y*<1.94. Prompt J/ψ are separated from J/ψ resulting from b-hadron decays through an analysis of the distance between the J/ψ decay vertex and the event primary vertex. The differential cross-section for production of nonprompt J/ψ is compared to a FONLL calculation that does not include nuclear effects. Forward-backward production ratios are presented and compared to theoretical predictions. These results constrain the kinematic dependence of nuclear modifications of charmonium and b-quark production in p+Pb collisions.