Study of charmonium production via the decay to $p\bar{p}$ at $\sqrt{s} = 13 TeV$

TL;DR

This paper measures the production cross-section of charmonium states, especially the $ ext{η}_c$, in proton-proton collisions at 13 TeV using the LHCb detector, extending previous analyses and setting new upper limits.

Contribution

It provides the first measurements of differential cross-sections in both $p_T$ and rapidity for $ ext{η}_c$, and establishes upper limits for $ ext{η}_c(2S)$ and $h_c(1P)$ production.

Findings

Measured $ ext{η}_c$ production cross-section in specified kinematic range.

Extended previous analyses with new differential measurements.

Set upper limits on $ ext{η}_c(2S)$ and $h_c(1P)$ production cross-sections.

Abstract

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.