Measurement of d* Photoproduction at three different centre-of-mass energies at Hera

The ZEUS collaboration

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Abstract

The photoproduction of D∗± mesons has been measured with the ZEUS detector at HERA at three different ep centre-of-mass energies, √s, of 318, 251 and 225GeV. For each data set, D∗± mesons were required to have transverse momentum, pD T , and pseudorapidity, ηD , in the ranges 1.9 < pD T < 20GeV and |ηD∗ | < 1.6. The events were required to have a virtuality of the incoming photon, Q2, of less than 1GeV2. The dependence on √s was studied by normalising to the high-statistics measurement at √s = 318GeV. This led to the cancellation of a number of systematic effects both in data and theory. Predictions from next-to-leading-order QCD describe the √s dependence of the data well

Original languageEnglish
Article number3
JournalJournal of High Energy Physics
Volume2014
Issue number10
DOIs
StatePublished - Oct 2014

Keywords

  • Charm physics
  • Heavy quark production
  • Lepton-Nucleon Scattering
  • QCD

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