Abstract
We present results on transverse momentum (p_{mathrm {textsc {t}}}) and rapidity (y) differential production cross sections, mean transverse momentum and mean transverse momentum square of inclusive mathrm {J}/psi and psi mathrm {(2S)} at forward rapidity (2.5<y<4) as well as psi mathrm {(2S)}-to-mathrm {J}/psi cross section ratios. These quantities are measured in pp collisions at center of mass energies sqrt{s},=5.02 and 13 TeV with the ALICE detector. Both charmonium states are reconstructed in the dimuon decay channel, using the muon spectrometer. A comprehensive comparison to inclusive charmonium cross sections measured at sqrt{s},=2.76, 7 and 8 TeV is performed. A comparison to non-relativistic quantum chromodynamics and fixed-order next-to-leading logarithm calculations, which describe prompt and non-prompt charmonium production respectively, is also presented. A good description of the data is obtained over the full p_{mathrm {textsc {t}}} range, provided that both contributions are summed. In particular, it is found that for p_{mathrm {textsc {t}}}>15 GeV/c the non-prompt contribution reaches up to 50% of the total charmonium yield.
Highlights
Charmonia, such as J/ψ and ψ(2S), are bound states of a charm and anti-charm quark
The inclusive J/ψ and ψ(2S) differential cross sections as well as ψ(2S)-to-J/ψ cross section ratios as a√function of pt and y have been measured in pp collisions at s = 5.02 and
=13 TeV significantly extend the pt reach for both charmonium states with respect to measurements performed by ALICE at lower energies, up to 30 GeV/c for the J/ψ and 16 GeV/c for the ψ(2S)
Summary
Charmonia, such as J/ψ and ψ(2S), are bound states of a charm and anti-charm quark (cc). Compared 2.76 [12], to similar 7 [13] and measurements per TeV [14] These comparisons allow studying the variations of quantities such as the mean transverse momentum pt , mean transverse momentum squa√re pt and the pt-integrated cross section as a function of s. Put together, these measurements constitute a stringent test for models of charmonium production. An extensive comparison of the J/ψ and ψ(2S) cross sections at all available collision energies to the calculations from two NRQCD groups is presented towards the end of the paper
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