Abstract
The production of D⁎±, D± and Ds± charmed mesons has been measured with the ATLAS detector in pp collisions at s=7 TeV at the LHC, using data corresponding to an integrated luminosity of 280 nb−1. The charmed mesons have been reconstructed in the range of transverse momentum 3.5<pT(D)<100 GeV and pseudorapidity |η(D)|<2.1. The differential cross sections as a function of transverse momentum and pseudorapidity were measured for D⁎± and D± production. The next-to-leading-order QCD predictions are consistent with the data in the visible kinematic region within the large theoretical uncertainties. Using the visible D cross sections and an extrapolation to the full kinematic phase space, the strangeness-suppression factor in charm fragmentation, the fraction of charged non-strange D mesons produced in a vector state, and the total cross section of charm production at s=7 TeV were derived.
Highlights
Measurements of heavy-quark production at the Large Hadron Collider (LHC) provide a means to test perturbative quantum chromodynamics (QCD) calculations at the highest available collision energies
The measured D cross sections are compared with the fixed-order next-to-leading-logarithm (FONLL) [17,18,19] predictions, with the general-mass variable-flavour-number scheme (GMVFNS) [20,21,22] calculations and with the NLO QCD calculations matched with a leadinglogarithm parton-shower Monte Carlo (MC) simulation (NLO-MC)
The production of D∗±, D± and Ds± charmed mesons has been measured in the kinematic aret g√iosn =3.75
Summary
Measurements of heavy-quark production at the Large Hadron Collider (LHC) provide a means to test perturbative quantum chromodynamics (QCD) calculations at the highest available collision energies. Measurements of the inclusive D∗+, D+ and Ds+ production cross sections and their comparison with next-to-leading-order (NLO) QCD calculations are presented. Contributions from both charm hadronisation and bottom hadron decays have been included in the measured visible D production cross sections and in the NLO QCD predictions. The extrapolated cross section√s have been used to calculate the total cross section of charm production in pp collisions at s = 7 TeV and two fragmentation ratios for charged charmed mesons: the strangeness-suppression factor and the fraction of charged non-strange D mesons produced in a vector state
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