Speaker
Marta RUSPA
(Univ Piemonte Orientale)
Description
The diffractive dissociation of virtual photons, gamma*p -> X
p, has been measured with the ZEUS detector in e+p collisions at HERA.
Events were selected either by requiring a large rapidity gap between
the system X and the outgoing proton, or by tagging the outgoing
proton, or by exploiting the different distribution of the the mass of
the system X for diffractive and non diffractive events. 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. The data are
also shown in terms of the reduced diffractive cross sections,
sigma_r^{D(3)} and sigma_r^{D(4)}.
