Inclusive J/$\psi$ production at midrapidity in pp collisions at $\sqrt{s}~=~13$ TeV

TL;DR

This paper measures the inclusive J/ψ production cross section at midrapidity in proton-proton collisions at 13 TeV, providing new data that supports existing models and shows a logarithmic energy dependence.

Contribution

First measurement of inclusive J/ψ production cross section at 13 TeV in pp collisions at midrapidity, comparing results with models and lower energy data.

Findings

Measured cross section: 8.97 μb at y=0

Results agree with non-relativistic QCD and Color Evaporation models

Data suggests a logarithmic energy dependence

Abstract

We report on the inclusive J/$\psi$ production cross section measured at the CERN Large Hadron Collider in proton-proton collisions at a centre-of-mass energy $\sqrt{s}~=~13$ TeV. The J/$\psi$ mesons are reconstructed in the $\rm e^{+} e^{-}$ decay channel and the measurements are performed at midrapidity ($|y|<0.9$) in the transverse-momentum interval $0< p_{\rm T} <40$ GeV/$c$, using a minimum-bias data sample corresponding to an integrated luminosity $L_{\text{int}} = 32.2~\text{nb}^{-1}$ and an Electromagnetic Calorimeter triggered data sample with $L_{\text{int}} = 8.3~\mathrm{pb}^{-1}$. The $p_{\rm T}$-integrated J/$\psi$ production cross section at midrapidity, computed using the minimum-bias data sample, is $\text{d}\sigma/\text{d}y|_{y=0} = 8.97\pm0.24~(\text{stat})\pm0.48~(\text{syst})\pm0.15~(\text{lumi})~\mu\text{b}$. An approximate logarithmic dependence with the collision energy is suggested by these results and available world data, in agreement with model predictions. The integrated and $p_{\rm T}$-differential measurements are compared with measurements in pp collisions at lower energies and with several recent phenomenological calculations based on the non-relativistic QCD and Color Evaporation models.