Abstract
Measurements of differential cross-sections for $J/\psi$ production in p+Pb collisions at $\sqrt{s_{NN}}$ = 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 $J/\psi$ mesons are reconstructed in the dimuon decay channel over the transverse momentum range $8<p_{\mathrm{T}}<30$ GeV and over the center-of-mass rapidity range $-2.87<y^{*}<1.94$. Prompt $J/\psi$ are separated from $J/\psi$ resulting from $b$-hadron decays through an analysis of the distance between the $J/\psi$ decay vertex and the event primary vertex. The differential cross-section for production of nonprompt $J/\psi$ 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.
Highlights
Quarkonium production in heavy-ion collisions is expected to be highly sensitive to the nature of the hot and dense matter created in these collisions [1]
Such suppression was observed at fixed-target experiments at the CERN Super Proton Synchrotron (SPS) [3,4,5,6,7] and in collider experiments at the BNL Relativistic Heavy Ion Collider (RHIC) [8,9,10] and the CERN Large Hadron Collider (LHC) [11,12,13]
This paper presents measurements of differential cross sections for prom√pt and Pb collisions at sNN
Summary
Quarkonium production in heavy-ion collisions is expected to be highly sensitive to the nature of the hot and dense matter created in these collisions [1]. Suppression of the J /ψ yield in nucleus-nucleus (A + A) collisions with respect to protonproton (pp) collisions was predicted to be a signal for deconfinement in the quark-gluon plasma [2] Such suppression was observed at fixed-target experiments at the CERN Super Proton Synchrotron (SPS) [3,4,5,6,7] and in collider experiments at the BNL Relativistic Heavy Ion Collider (RHIC) [8,9,10] and the CERN Large Hadron Collider (LHC) [11,12,13].
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