The ZEUS Leading Proton Spectrometer and its use in the measurement of elastic rho(0) photoproduction at HERA

The differential cross section d sigma/dt for elastic rho(0) photoproduction, gamma p --> rho(0)p (rho(0) --> pi(+)pi(-)), has been measured in ep interactions at HERA. The squared four-momentumexchanged at the protonvertex, t, has been determined directly by measuring the momentumof the scattered protonusing the ZEUS Leading ProtonSpectrometer (LPS), a large scale system of silicon micro-strip detectors operating close to the HERA protonbeam. The LPS allows the measurement of the momentumof high energy protonsscattered at small angles with accuracies of 0.4% for the longitudinal momentumand 5 MeV for the transverse momentum. Photoproduction of rho(0) mesons has been investigated in the interval 0.073 < \t\ < 0.40 GeV2, for photon virtualities Q(2) < 1 GeV2 and photon- protoncentre-of-mass energies W between 50 and 100 GeV. In the measured range, the t distribution exhibits an exponential shape with a slope parameter b = 9.8 +/- 0.8 (stat.) +/- 1.1 (syst.) GeV-2. The use of the LPS eliminates the contamination from events with diffractive dissociation of the protoninto low mass states.