What question did this study set out to answer?

The aim is to measure the differential cross-sections and forward-backward ratios for J/Psi production in p+Pb collisions.

June 3, 2026Open Access

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

Key Points

The aim is to measure the differential cross-sections and forward-backward ratios for J/Psi production in p+Pb collisions.
Measurements were conducted using the ATLAS detector at LHC with an integrated luminosity of 28.1 nb$^{-1}$.
J/Psi mesons were reconstructed in the dimuon decay channel over the transverse momentum range 8<pT<30 GeV.
Separation of prompt J/Psi from nonprompt J/Psi was achieved through vertex analysis.
Differential cross-section for nonprompt J/Psi is compared to FONLL calculations without nuclear effects.
Forward-backward production ratios are presented and show consistency with theoretical predictions.
These results provide insights into the kinematic dependence of nuclear modifications in charmonium production.

Abstract

Measurements of differential cross-sections for J/ production in p+Pb collisions at s₍₍ = 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/ mesons are reconstructed in the dimuon decay channel over the transverse momentum range 8<pₓ<30 GeV and over the center-of-mass rapidity range -2. 87<y^*<1. 94. Prompt J/ are separated from J/ resulting from b-hadron decays through an analysis of the distance between the J/ decay vertex and the event primary vertex. The differential cross-section for production of nonprompt J/ 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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