Diffractive D^* Meson Production in DIS at HERA

Reference O Gutsche, presented at ICHEP2004, Summer 2004
Document Conference paper
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Contact O Behnke, S Vinokurova, R Wolf
Abstract A new measurement is presented of D* meson production in diffractive deep-inelastic scattering at HERA. The data were collected in the years 1999 and 2000 and correspond to an integrated luminosity of 42.6 pb^-1. Cross sections are measured for the process ep -> eXY where the system X contains at least one D* meson and is separated by a large rapidity gap from a low mass proton remnant system Y. The cross section is given in the deep-inelastic kinematic region of 2< Q^2 < 100 GeV^2 with inelasticity 0.05 < y < 0.7. The diffractive kinematic region is defined by xpom < 0.04, M_Y < 1.6 GeV and |t| < 1 GeV^2. The D* mesons are restricted to the range pt_lab > 2 GeV and |eta_lab| < 1.5. The cross section is presented differentially as a function of various kinematic variables. The data are compared with NLO QCD calculations using the recent H1 diffractive PDF's as well as with a model of 2-gluon exchange.
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