Author/Authors :
ZEUS Collaboration، نويسنده , , J. Breitweg، نويسنده , , M. Derrick، نويسنده , , D. Krakauer، نويسنده , , S. Magill، نويسنده , , D. Mikunas، نويسنده , , B. Musgrave، نويسنده , , J. Repond، نويسنده , , Christopher R. Stanek، نويسنده , , R.L. Talaga، نويسنده , , R. Yoshida، نويسنده , , H. Zhang، نويسنده , , M.C.K. Mattingly، نويسنده , , F. Anselmo، نويسنده , , P. Antonioli، نويسنده , , G. Bari، نويسنده , , M. Basile، نويسنده , , L. Bellagamba، نويسنده , , D. Boscherini، نويسنده , , C. B. Vicentini and A. Bruni، نويسنده , , et al.، نويسنده ,
Abstract :
This paper presents measurements of D∗± production in deep inelastic scattering from collisions between 27.5 GeV positrons and 820 GeV protons. The data have been taken with the ZEUS detector at HERA. The decay channel D∗+ → (D0 → K−π+)π+ (+c.c) has been used in the study. The e+p cross section for inclusive D∗± production with 5 < Q2 < 100 GeV2> and y < 0.7 is 5.3 ± 1.0 ± 0.8 nb in the kinematic region 1.3 < pT(D∗±) < 9.0 GeV and |η(D∗±)| < 1.5. Differential cross sections as functions of pT(D∗±), η(D∗±), W and Q2 are compared with next-to-leading order QCD calculations based on the photon-gluon fusion production mechanism. After an extrapolation of the cross section to the full kinematic region in pT(D∗±) and η(D∗±), the charm contribution F2cc̄(x, Q2) to the proton structure function is determined for Bjorken x between 2 · 10−4 and 5 · 10−3.
