Measurement of forward $J/\psi$ production cross-sections in $pp$ collisions at $\sqrt{s}=13$ TeV
JHEP 1510 (2015) 172, 2015.
The collaboration

Abstract (data abstract)
CERN-LHC. The production of $J/\psi$ mesons in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 13$ TeV is studied with the LHCb detector. Cross-section measurements are performed as a function of the transverse momentum $p_\perp$ and the rapidity $y$ of the $J/\psi$ meson in the region $p_\perp < 14$ GeV/$c$ and $2.0 < y < 4.5$, for both prompt $J/\psi$ mesons and $J/\psi$ mesons from $b$-hadron decays. The production cross-sections integrated over the kinematic coverage are $15.30 \pm 0.03 \pm 0.86$ $\mu$b for prompt $J/\psi$ and $2.34 \pm 0.01 \pm 0.13$ $\mu$b for $J/\psi$ from $b$-hadron decays, assuming zero polarization of the $J/\psi$ meson. The first uncertainties are statistical and the second systematic. The cross-section reported for $J/\psi$ mesons from $b$-hadron decays is used to extrapolate to a total $b\bar{b}$ cross-section. The ratios of the cross-sections with respect to $\sqrt{s} = 8$ TeV are also determined.

Version 2 modifications: Update data sets to corrected measurements published in erratum JHEP 1705 (2017) 063.