Measurement of the open charm contribution to the diffractive proton structure function

Production of D*+/-(2010) mesons in diffractive deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 82 pb^{-1}. Diffractive events were identified by the presence of a large rapidity gap in the final state. Differential cross sections have been measured in the kinematic region 1.5 < Q^2 < 200 GeV^2, 0.02 < y < 0.7, x_{IP} < 0.035, beta < 0.8, p_T(D*+/-) > 1.5 GeV and |\eta(D*+/-)| < 1.5. The measured cross sections are compared to theoretical predictions. The results are presented in terms of the open-charm contribution to the diffractive proton structure function. The data demonstrate a strong sensitivity to the diffractive parton densities.

Note:

35 pages, 11 figures, 6 tables Report-no: DESY-03-094

electron p: colliding beams
positron p: colliding beams
electron p: deep inelastic scattering
D*(2010): electroproduction
diffraction: structure function
p: structure function
rapidity: gap
structure function: charm
differential cross section: x-dependence
transverse momentum dependence

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Figures(0)

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