Deep inelastic scattering with leading protons or large rapidity gaps at HERA

Details Deep inelastic scattering with leading protons or large rapidity gaps at HERA Deep inelastic scattering with leading protons or large rapidity gaps at HERA

2008-12-10

arxiv.org/abs/0812.2003v3

Nucl.Phys.B816:1-61,2009

Physics

High Energy Physics

High Energy Physics - Experiment

Typos fixed. This version coincides with that in Nucl. Phys. B 816 (2009) 1-61

Scientific paper

10.1016/j.nuclphysb.2009.03.003

The dissociation of virtual photons, $\gamma^{\star} p \to X p$, in events with a large rapidity gap between $X$ and the outgoing proton, as well as in events in which the leading proton was directly measured, has been studied with the ZEUS detector at HERA. The data cover photon virtualities $Q^2>2$ GeV$^2$ and $\gamma^{\star} p$ centre-of-mass energies $402$ GeV, where $M_X$ is the mass of the hadronic final state, $X$. Leading protons were detected in the ZEUS leading proton spectrometer. The cross section is presented as a function of $t$, the squared four-momentum transfer at the proton vertex and $\Phi$, the azimuthal angle between the positron scattering plane and the proton scattering plane. It is also shown as a function of $Q^2$ and $\xpom$, the fraction of the proton's momentum carried by the diffractive exchange, as well as $\beta$, the Bjorken variable defined with respect to the diffractive exchange.

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