Abstract
The measurements of the production of prompt {{mathrm{D}}^0}, {{mathrm{D}}^+}, {{mathrm{D}}^{*+}}, and {{mathrm{D}}^+_{mathrm{s}}} mesons in proton–proton (pp) collisions at sqrt{s}=5.02~mathrm {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 mathrm{D}^0 rightarrow {mathrm{K}}^-pi ^+, mathrm{D}^+rightarrow {mathrm{K}}^-pi ^+pi ^+, {mathrm{D}}^{*+} rightarrow {mathrm{D}}^0 pi ^+ rightarrow {mathrm{K}}^- pi ^+ pi ^+, {{mathrm{D}}^{+}_{mathrm{s}}rightarrow phi pi ^+rightarrow {mathrm{K}}^{+} {mathrm{K}}^{-} pi ^{+}}, and their charge conjugates. The production cross sections were measured in the transverse momentum interval 0<p_{mathrm{T}}<36~mathrm {GeV}/c for {{mathrm{D}}^0}, 1<p_{mathrm{T}}<36~mathrm {GeV}/c for {{mathrm{D}}^+} and {{mathrm{D}}^{*+}}, and in 2<p_{mathrm{T}}<24~mathrm {GeV}/c for {{mathrm{D}}^+_{mathrm{s}}} mesons. Thanks to the higher integrated luminosity, an analysis in finer p_{mathrm{T}} bins with respect to the previous measurements at sqrt{s}=7~mathrm {TeV} was performed, allowing for a more detailed description of the cross-section p_{mathrm{T}} shape. The measured p_{mathrm{T}}-differential production cross sections are compared to the results at sqrt{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 sqrt{s}=5.02~mathrm {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.
Highlights
The study of the production of hadrons containing heavy quarks, i.e. charm and beauty, in proton–proton collisions at Large Hadron Collider (LHC) energies is a sensitive test of Quantum Chromodynamics (QCD) calculations with the factorisation approach
At LHC energies, calculations based on collinear factorisation are available in the general-mass variable-flavour-number scheme, GMVFNS [3,4,5,6], and in the fixed order plus next-to-leading logarithms approach, FONLL [7,8], both of them having nextto-leading order (NLO) accuracy with all-order resummation of next-to-leading logarithms
The prompt fraction measured with the fits to the impactparameter distributions of D-meson candidates has three main sources of systematic uncertainty, namely (i) the assumption on the shape of the impact-parameter distribution for each contribution; (ii) the uncertainty on the signal and background yields extracted from the invariant-mass fits; and (iii) the consistency of the procedure, evaluated with a Monte Carlo closure test
Summary
The study of the production of hadrons containing heavy quarks, i.e. charm and beauty, in proton–proton (pp) collisions at LHC energies is a sensitive test of Quantum Chromodynamics (QCD) calculations with the factorisation approach. In this scheme, the transverse momentum ( pT) differential production cross sections of hadrons containing charm or beauty quarks are calculated as a convolution of three terms: (i) the parton distribution functions. The ratios of D0-meson production cross sections at mid- and forward rapidity are reported, using the measurements done at forw√ard collisions at s rapidity by = 5.02 TeV the LHCb [22]
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