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

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Summary

Introduction

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

The ATLAS detector
Event simulation
QCD calculations
Event selection
Reconstruction of charmed mesons
Data correction and systematic uncertainties
Production cross sections of charmed mesons
Extrapolation to the full kinematic phase space
Total charm production cross section
Charm fragmentation ratios
Findings
10. Summary
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