Measurement of D+- production and the charm contribution to F_2 in deep inelastic scatterin.pdf

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2017-04-09 发布于江苏
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Measurement of D+- production and the charm contribution to F_2 in deep inelastic scatterin.pdf

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MeasurementofD-productionandthecharmcontributiontoF_2indeepinelasticscatterin

a r X i v : h e p - e x / 9 9 0 8 0 1 2 v 3 3 A p r 2 0 0 0 Measurement of D?± production and the charm contribution to F2 in deep inelastic scattering at HERA ZEUS Collaboration Abstract The production of D?±(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?+ → D0π+ (+ c.c.), with D0 → K?π+ or D0 → K?π?π+π+, have been used to identify the D mesons. The e+p cross section for inclusive D?± production with 1 Q2 600GeV2 and 0.02 y 0.7 is 8.31±0.31(stat.)+0.30 ?0.50(syst.) nb in the kinematic region 1.5 pT (D ?±) 15GeV and | η(D?±) | 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 pT (D ?±) and η(D?±) in order to determine the charm contribution, F cc?2 (x,Q 2), to the proton structure function. The ratio F cc?2 /F2 rises from ?10% at Q2 ? 1.8 GeV2 to ?30% at Q2 ?130 GeV2 for x values in the range 10?4 to 10?3. Eur. Phys. J. C12 (2000) 35-52 The ZEUS Collaboration J. Breitweg, S. Chekanov, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, A. Pellegrino, J. Repond, R. Stanek, R. Yoshida Argonne National Laboratory, Argonne, IL, USA p M.C.K. Mattingly Andrews University, Berrien Springs, MI, USA G. Abbiendi, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini1, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini2, L. Cifarelli3, F. Cindolo, A. Contin, N. Cop- pola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci4, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia5, A. Zichichi University and INFN Bologna, Bologna, Italy f C. Amelung, A. Bornheim, I. Brock, K. Cobo?ken, J. Crittenden, R. Deffner, M. Eckert6, H. Ha