Inclusive J/ψ production at midrapidity in pp collisions at √s=13 TeV

Abstract

We report on the inclusive \(\text {J}/\psi \) production cross section measured at the CERN Large Hadron Collider in proton–proton collisions at a center-of-mass energy \(\sqrt{s}~=~13\) TeV. The \(\text {J}/\psi \) mesons are reconstructed in the \(\text {e}^{+}\text {e}^{-}\) decay channel and the measurements are performed at midrapidity (\(|y|<0.9\)) in the transverse-momentum interval \(0<p_{\mathrm{T}} <40\) 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 \(p_{\mathrm{T}}\)-integrated \(\text {J}/\psi \) production cross section at midrapidity, computed using the minimum-bias data sample, is \(\text {d}\sigma /\text {d}y|_{y=0} = 8.97\pm 0.24~(\text {stat})\pm 0.48~(\text {syst})\pm 0.15~(\text {lumi})~\mu \text {b}\). 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 \(p_{\mathrm{T}}\)-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.