Leading neutron energy and pT distributions in deep inelastic scattering and photoproduction at HERAстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The production of energetic neutrons in ep collisions has been studied with the ZEUS detector at HERA. The neutron energy and p2T distributions were measured with a forward neutron calorimeter and tracker in a 40\pb−1 sample of inclusive deep inelastic scattering (DIS) data and a 6\pb−1 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 p2T 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.