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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 $40<W<240$ GeV, with $M_X>2$ 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.

4 data tables match query

Table 12

The azimuthal asymmetries ALT and ATT as a function of X(NAME=POMERON).

Table 13

The azimuthal asymmetries ALT and ATT as a function of BETA.

Table 14

The azimuthal asymmetries ALT and ATT as a function of ABS(T).

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MEASUREMENT OF POLARIZATION IN THE pi- p ---> pi0, n, pi0 ---> 2 gamma REACTION AT 40-GeV/c WITH THE REGISTRATION OF ALL REACTION PRODUCTS

POLARIZATION ASYMMETRY OSCILLATIONS IN REACTION pi- p ---> p0 n AT t <= 3-GeV/c**2

THE OBSERVATION OF THE ASYMMETRY IN THE REACTION pi- polarized p ---> pi0 X AT THE ANGLE 90-degrees IN cms AT 40-GeV/c

OBSERVATION OF THE ASYMMETRY IN THE REACTION pi- polarized p ---> omega n AT 40-GeV/c

MEASUREMENT OF ASYMMETRY IN THE REACTION pi- polarized p ---> K0 LAMBDA AT 40-GeV/c

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