Measurements of the production cross sections of prompt D0, D+, D*+, , , and charm hadrons at midrapidity in proton-proton collisions at = 13 TeV with the ALICE detector are presented. The D-meson cross sections as a function of transverse momentum (pT) are provided with improved precision and granularity. The ratios of pT-differential meson production cross sections based on this publication and on measurements at different rapidity and collision energy provide a constraint on gluon parton distribution functions at low values of Bjorken-x (10−5–10−4). The measurements of ( ) baryon production extend the measured pT intervals down to pT = 0(3) GeV/c. These measurements are used to determine the charm-quark fragmentation fractions and the production cross section at midrapidity (|y| < 0.5) based on the sum of the cross sections of the weakly-decaying ground-state charm hadrons D0, D+, , , and, for the first time, , and of the strongly-decaying J/ψ mesons. The first measurements of and fragmentation fractions at midrapidity are also reported. A significantly larger fraction of charm quarks hadronising to baryons is found compared to e+e− and ep collisions. The production cross section at midrapidity is found to be at the upper bound of state-of-the-art perturbative QCD calculations.
Charm production and fragmentation fractions at midrapidity in pp collisions at √s=13 TeV
Barile, F.Membro del Collaboration Group
;Colella, D.Membro del Collaboration Group
;Di Bari, D.Membro del Collaboration Group
;Mazzilli, M.Membro del Collaboration Group
;Volpe, G.Membro del Collaboration Group
;
2023-01-01
Abstract
Measurements of the production cross sections of prompt D0, D+, D*+, , , and charm hadrons at midrapidity in proton-proton collisions at = 13 TeV with the ALICE detector are presented. The D-meson cross sections as a function of transverse momentum (pT) are provided with improved precision and granularity. The ratios of pT-differential meson production cross sections based on this publication and on measurements at different rapidity and collision energy provide a constraint on gluon parton distribution functions at low values of Bjorken-x (10−5–10−4). The measurements of ( ) baryon production extend the measured pT intervals down to pT = 0(3) GeV/c. These measurements are used to determine the charm-quark fragmentation fractions and the production cross section at midrapidity (|y| < 0.5) based on the sum of the cross sections of the weakly-decaying ground-state charm hadrons D0, D+, , , and, for the first time, , and of the strongly-decaying J/ψ mesons. The first measurements of and fragmentation fractions at midrapidity are also reported. A significantly larger fraction of charm quarks hadronising to baryons is found compared to e+e− and ep collisions. The production cross section at midrapidity is found to be at the upper bound of state-of-the-art perturbative QCD calculations.File | Dimensione | Formato | |
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JHEP12(2023)086.pdf
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