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

ATLAS, Collaboration; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Measurement of differential J/ψ production cross-sections and forward-backward ratio in p+Pb collisions with the ATLAS detector. Physical review. C - nuclear physics, C92(3), 034904. American Institute of Physics 10.1103/PhysRevC.92.034904

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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<p T <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.

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