Measurement of $J/\psi$ production cross-sections in $pp$ collisions at $\sqrt{s}=5$ TeV

The LHCb collaboration
Aaij, R. , Abdelmotteleb, A.S.W. , Beteta, C. Abellán , Ackernley, T. , Adeva, B. , Adinolfi, M. , Afsharnia, H. , Agapopoulou, C. , Aidala, C.A. , Aiola, S.
JHEP 11 (2021) 181, 2021.

Abstract (data abstract)
CERN-LHC. The production cross-sections of $J/\psi$ mesons in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=5$ TeV are measured using a data sample corresponding to an integrated luminosity of $9.13\pm0.18$ pb$^{-1}$, collected by the LHCb experiment. The cross-sections are measured differentially as a function of transverse momentum, $p_\text{T}$, and rapidity, $y$, and separately for $J/\psi$ mesons produced promptly and from beauty hadron decays (nonprompt). With the assumption of unpolarised $J/\psi$ mesons, the production cross-sections integrated over the kinematic range $0<p_\text{T}<20$ GeV/$c$ and $2.0<y<4.5$ are $8.154\pm0.010\pm0.283\mu\text{b}$ for prompt $J/\psi$ mesons and $0.820\pm0.003\pm0.034\mu\text{b}$ for nonprompt $J/\psi$ mesons, where the first uncertainties are statistical and the second systematic. These cross-sections are compared with those at $\sqrt{s}=8$ TeV and 13 TeV, and are used to update the measurement of the nuclear modification factor in proton-lead collisions for $J/\psi$ mesons at a centre-of-mass energy per nucleon pair of $\sqrt{s_{NN}}=5$ TeV. The results are compared with theoretical predictions.

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