Leading neutron energy and pT distributions in deep inelastic scattering and photoproduction at HERA

Abstract

The production of energetic neutrons in $ep$ collisions has been studied with the ZEUS detector at HERA. The neutron energy and $p_T^2$ 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 $p_T^2$ 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.

arXiv comment48 pages, 6 tables, 23 figures, minor revisions, accepted by Nuclear Physics B

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Cited by in corpus (24)

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• Pion and Kaon Structure at the Electron-Ion Collider
• Leading twist nuclear shadowing phenomena in hard processes with nuclei
• Measurement of Leading Neutron Production in Deep-Inelastic Scattering at HERA
• Inclusive production of protons, anti-protons and neutrons in p+p collisions at 158 GeV/c beam momentum
• The Hadronic Final State at HERA
• Pion structure function from leading neutron electroproduction and SU(2) flavor asymmetry
• Deeply virtual Compton scattering on a virtual pion target
• Inclusive cross section and single-transverse-spin asymmetry for very forward neutron production in polarized p+p collisions at sqrt(s)=200 GeV
• Pion structure function at small x from DIS data
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• Selected topics in diffraction with protons and nuclei: past, present, and future
• Gluon saturation and Feynman scaling in leading neutron production
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• A comprehensive study of the inclusive production of negative pions in p+p collisions for interaction energies from 3 GeV to 13 TeV covering the non-perturbative sector of the Strong Interaction