Author/Authors :
ZEUS Collaboration، نويسنده , , Valeri S. Chekanov، نويسنده , , M. Derrick، نويسنده , , S. Magill، نويسنده , , S. Miglioranzi، نويسنده , , B. Musgrave، نويسنده , , D. Nicholass، نويسنده , , J. Repond، نويسنده , , R. Yoshida، نويسنده , , M.C.K. Mattingly، نويسنده , , M. Jechow، نويسنده , , N. Pavel، نويسنده , , A.G. Yagües Molina، نويسنده , , Mary Ann S. Antonelli، نويسنده , , P. Antonioli، نويسنده , , G. Bari، نويسنده , , M. Basile، نويسنده , , L. Bellagamba، نويسنده , , A. GIUNTOLI and M. BINDI، نويسنده , , D. Boscherini، نويسنده , , et al.، نويسنده ,
Abstract :
The production of energetic neutrons in ep collisions has been studied with the ZEUS detector at HERA. The neutron energy and image distributions were measured with a forward neutron calorimeter and tracker in a image sample of inclusive deep inelastic scattering (DIS) data and a image sample of photoproduction data. The neutron yield in photoproduction is suppressed relative to DIS for the lower neutron energies and the neutrons have a steeper image distribution, consistent with the expectation from absorption models. The distributions are compared to HERA measurements of leading protons. The neutron energy and transverse-momentum distributions in DIS are compared to Monte Carlo simulations and to the predictions of particle exchange models. Models of pion exchange incorporating absorption and additional secondary meson exchanges give a good description of the data.
