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

  • experimental physics
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Abstract.

The ZEUS detector has been used to study dissociation of virtual photons in events with a leading proton, \(\gamma^{*} p \to X p\), in e + p collisions at HERA. The data cover photon virtualities in two ranges, 0.03 < Q 2 < 0.60 GeV2 and 2 < Q 2 < 100 GeV2, with M X > 1.5 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, \(F_2^{\smash[t]{D(3)}}\). 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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Received: 10 August 2004, Revised: 4 October 2004, Published online: 9 November 2004

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The ZEUS Collaboration. Dissociation of virtual photons in events with a leading proton at HERA. Eur. Phys. J. C 38, 43–67 (2004). https://doi.org/10.1140/epjc/s2004-02047-4

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