Dissociation of virtual photons in events with a leading proton at HERA

Details Dissociation of virtual photons in events with a leading proton at HERA Dissociation of virtual photons in events with a leading proton at HERA

2004-08-04

arxiv.org/abs/hep-ex/0408009v3

Eur.Phys.J.C38:43-67,2004

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1140/epjc/s2004-02047-4

The ZEUS detector has been used to study dissociation of virtual photons in events with a leading proton, gamma^* p -> X p, in e^+p collisions at HERA. The data cover photon virtualities in two ranges, 0.031.5 GeV, where M_X is the mass of the hadronic final state, X. Events were required to have a leading proton, detected in the ZEUS leading proton spectrometer, carrying at least 90% of the incoming proton energy. The cross section is presented as a function of t, the squared four-momentum transfer at the proton vertex, Phi, the azimuthal angle between the positron scattering plane and the proton scattering plane, and Q^2. The data are presented in terms of the diffractive structure function, F_2^D(3). A next-to-leading-order QCD fit to the higher-Q^2 data set and to previously published diffractive charm production data is presented.

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