Abstract
Abstract The production of D *± mesons in deep inelastic ep scattering has been measured for exchanged photon virtualities 5 < Q 2 < 1000 GeV2, using an integrated luminosity of 363 pb−1 with the ZEUS detector at HERA. Differential cross sections have been measured and compared to next-to-leading-order QCD calculations. The cross-sections are used to extract the charm contribution to the proton structure functions, expressed in terms of the reduced charm cross section, $ \sigma_{\mathrm{red}}^{{c\overline{c}}} $ . Theoretical calculations based on fits to inclusive HERA data are compared to the results.
Highlights
Double-differential cross sections in Q2 and y are presented and used to extract the charm contribution to the proton structure functions in the form of the reduced charm cross section, σrcecd
The production of D∗± mesons in deep inelastic ep scattering has been measured for exchanged photon virtualities 5 < Q2 < 1000 GeV2, using an integrated luminosity of 363 pb−1 with the ZEUS detector at HERA
Cross sections for heavy-quark production in DIS were calculated at next-to-leading order (NLO), i.e. O(αs2), in the fixed-flavour-number scheme (FFNS), in which only light flavours and gluons are present as partons in the proton and heavy quarks are produced in the hard interaction [36]
Summary
In the kinematic range of the analysis, charged particles were tracked in the central tracking detector (CTD) [22,23,24] and in the microvertex detector (MVD) [25]. These components operated in a magnetic field of 1.43 T provided by a thin superconducting solenoid. The CTD consisted of 72 cylindrical drift chamber layers, organised in nine superlayers covering the polar-angle region 15◦ < θ < 164◦. The high-resolution uranium-scintillator calorimeter (CAL) [26,27,28,29] consisted of three parts: the forward, the barrel, and the rear (RCAL) calorimeters. The luminosity was measured using the Bethe-Heitler reaction ep → eγp by a luminosity detector which consisted of two independent systems: a lead-scintillator calorimeter [32,33,34] and a magnetic spectrometer [35]
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