Observation of events with an energetic forward neutron in deep inelastic scattering at HERA

In deep inelastic neutral current scattering of positrons and protons at the center of mass energy of 300 GeV, we observe, with the ZEUS detector, events with a high energy neutron produced at very small scattering angles with respect to the proton direction. The events constitute a fixed fraction of the deep inelastic, neutral current event sample independent of Bjorken x and Q² in the range 3 · 10⁻⁴ < xBJ < 6 · 10⁻³ and 10 < Q² < 100 GeV².

Note:

including 4 figures Report-no: DESY 96-093

positron p: colliding beams
colliding beams: positron p
positron p: deep inelastic scattering
deep inelastic scattering: positron p
n: electroproduction
electroproduction: n
production: small-angle
small-angle: production
n: leading particle
exchange: one-pion

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