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Measurement of \(D^{\ast \pm}\) production and the charm contribution to \(F_2\) in deep inelastic scattering at HERA

  • The ZEUS Collaboration
  • J. Breitweg et al.
Experimental physics

Abstract.

The production of \(D^{\ast \pm}\)(2010) mesons in deep inelastic scattering has been measured in the ZEUS detector at HERA using an integrated luminosity of 37 pb\(^{-1}\). The decay channels \(D^{\ast +}\rightarrow D^0 \pi^+ \) (+ c.c.), with \(D^0 \rightarrow K^- \pi^+\) or \(D^0 \rightarrow K^- \pi^- \pi^+ \pi^+\), have been used to identify the D mesons. The \(e^+p\) cross section for inclusive \(D^{\ast \pm}\) production with \(1 < Q^2 < 600\,\)GeV\(^2\) and \(0.02< y < 0.7\) is \(8.31 \pm 0.31 \mbox{(stat.)}^{+0.30}_{-0.50}\mbox{(syst.)}\) nb in the kinematic region \(1.5 < p_T(D^{\ast \pm}) < 15\) GeV and \(|\eta(D^{\ast \pm})| < 1.5\). Differential cross sections are consistent with a next-to-leading-order perturbative-QCD calculation when using charm-fragmentation models which take into account the interaction of the charm quark with the proton remnant. The observed cross section is extrapolated to the full kinematic region in \(p_T(D^{\ast \pm})\) and \(\eta(D^{\ast \pm})\) in order to determine the charm contribution, \(F_{2}^{c\bar c}(x,Q^2)\), to the proton structure function. The ratio \(F_{2}^{c\bar c}/F_{2}\) rises from \(\simeq\)10% at \(Q^2 \simeq\) 1.8 GeV\(^2\) to \(\simeq\)30% at \(Q^2 \simeq \)130 GeV\(^2\) for x values in the range \(10^{-4}\) to \(10^{-3}\).

Keywords

Structure Function Differential Cross Section Inelastic Scattering Decay Channel Differential Cross 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • The ZEUS Collaboration
  • J. Breitweg et al.
    • 1
  1. 1.Argonne National Laboratory, Argonne, IL, USA US

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