engleski

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

We report on the inclusive J/ψ production cross section measured at the CERN Large Hadron Collider in proton-proton collisions at a center-of-mass energy √s = ~13 TeV. The J/ψ mesons are reconstructed in the e+e− decay channel and the measurements are performed at midrapidity (∣y∣<0.9) in the transverse-momentum interval 0<pT<40 GeV/cc, using a minimum-bias data sample corresponding to an integrated luminosity L_int = 32.2 nb−1 and an Electromagnetic Calorimeter triggered data sample with L_int = 8.3 pb−1. The pT-integrated J/ψ production cross section at midrapidity, computed using the minimum-bias data sample, is dσ/dy∣y=0 = 8.97±0.24(stat)±0.48(syst)±0.15(lumi)μb. 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 pT-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.

J/psi(3100): inclusive production ; p p: scattering ; color: evaporation ; cross section: measured ; quantum chromodynamics: nonrelativistic ; calorimeter: electromagnetic ; transverse momentum ; CERN LHC Coll ; ALICE ; experimental results ; 13000 GeV-cms/nucleon

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