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Inclusive D-meson Production in Deep Inelastic Scattering at HERA |
| Reference |
J.Wagner, talk presented at DIS 2002, April 2002 |
| Document |
Conference paper
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| Figures |
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| Contact |
J Gassner, C Grab |
| Abstract |
The inclusive production of charmed mesons in deep inelastic scattering is studied with the H1 detector at HERA. Inclusive production cross sections are measured for the vector Dstar and for the pseudoscalar charmed mesons Dzero, Dsubs and, for the first time at HERA, also Dplus mesons. The finite lifetimes of 0.4 to 1 ps for the pseudoscalar mesons lead to a separation of their production and decay vertices, which is exploited to distinguish signal and background processes and to substantially improve the signal qualities. Differential distributions are measured for the Dplus and Dzero mesons and compared with predictions, based on LO Monte Carlo simulations. The measured production cross sections are used to test the isospin invariance of the fragmentation process and to extract the strangeness suppression factor gamma_s and the fraction P_V of D-mesons produced in a vector state. The results are compared with values measured e.g. at e^+ e^- colliders and allow tests of the assumed universality of the charm fragmentation process. |
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