Charmonium production cross-section in proton-proton collisions is measured at the centre-of-mass energy $\sqrt{ s}=13\,TeV$ using decays to $p\bar{ p}$ final state. The study is performed using a data sample corresponding to an integrated luminosity of $2.2\,{ fb}^{ -1}$ collected in 2018 with the $LHCb$ detector. The production cross-section of the $\eta_c$ meson is measured in a rapidity range of $2.0 < y < 4.0$ and in a transverse momentum range of $5.0 < p_{ T} < 20.0\,{ GeV/\it{ c}}$, which is extended compared with previous $LHCb$ analyses. The differential cross-section is measured in bins of $p_{ T}$ and, for the first time, of $y$. Upper limits, at 90% and 95% confidence levels, on the $\eta_c(2S)$ and $h_c(1P)$ prompt production cross-sections are determined for the first time.
Categories: hep-ex