Study of $J/\psi$ production and cold nuclear matter effects in $p$Pb collisions at $\sqrt{s_{NN}}=5\mathrm{TeV}$

Abstract

The production of $J/\psi$ mesons with rapidity $1.5<y<4.0$ or $-5.0<y<-2.5$ and transverse momentum $p_{\mathrm{T}}<14\mathrm{GeV}/c$ is studied with the LHCb detector in proton-lead collisions at a nucleon-nucleon centre-of-mass energy $\sqrt{s_{NN}}=5\mathrm{TeV}$. The analysis is based on a data sample corresponding to an integrated luminosity of about $1.6{\mathrm{nb}}^{-1}$. For the first time the nuclear modification factor and forward-backward production ratio are determined separately for prompt $J/\psi$ mesons and $J/\psi$ from $b$-hadron decays. Clear suppression of prompt $J/\psi$ production with respect to proton-proton collisions at large rapidity is observed, while the production of $J/\psi$ from $b$-hadron decays is less suppressed. These results show good agreement with available theoretical predictions. The measurement shows that cold nuclear matter effects are important for interpretations of the related quark-gluon plasma signatures in heavy-ion collisions.

26 pages, 7 figures; 7 tables, Published in JHEP

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