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Measurement of D0, D+, D∗+ and Ds+ production in pp collisions at √s=5.02 TeV with ALICE

The measurements of the production of prompt D0 , D+ , D∗+ , and D+s mesons in proton–proton (pp) collisions at √s=5.02 TeV with the ALICE detector at the Large Hadron Collider (LHC) are reported. D mesons were reconstructed at mid- rapidity ( |y| <0.5 ) via their hadronic decay channels D0→K−π+ , D+→K−π+π+ , D∗+→D0π+→K−π+π+ , D+s→ϕπ+→K+K−π+ , and their charge conjugates. The production cross sections were measured in the transverse momentum interval pT<0, 36> GeV/c for D0 , pT<1, 36> GeV/c for D+ and D∗+ , and in pT<2, 24> GeV/c for D+s mesons. Thanks to the higher integrated luminosity, an analysis in finer pT bins with respect to the previous measurements at √s=7 TeV was performed, allowing for a more detailed description of the cross-section pT shape. The measured pT -differential production cross sections are compared to the results at √s=7 TeV and to four different perturbative QCD calculations. Its rapidity dependence is also tested combining the ALICE and LHCb measurements in pp collisions at √s=5.02 TeV . This measurement will allow for a more accurate determination of the nuclear modification factor in p–Pb and Pb–Pb collisions performed at the same nucleon–nucleon centre-of-mass energy.

p p scattering ; quantum chromodynamics perturbation theory ; heavy ion scattering ; meson heavy ; heavy quark ; CERN LHC Coll ; rapidity dependence ; nucleon nucleon scattering ; hadronic decay ; p nucleus: scattering ; charmed meson: production ; charmed meson: decay ; cross section: measured ; experimental results ; 5020 GeV-cms/nucleon

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