Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 36: Electromagnetic Probes V, CERN, HERA Results

HK 36.4: Talk

Tuesday, March 17, 1998, 18:15–18:30, B

Measurement of Leading Neutrons in Deep Inelastic Scattering at HERA — •F. Metlica — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

In 1996 a new Forward Neutron Calorimeter (FNC) was installed in the H1 experiment at HERA, to measure the energy and angle of high energy leading neutrons produced in ep→e’nX. This deep inelastic scattering process is of interest because one pion exchange is thought to be the dominant contribution at small momentum transfers. These neutrons are produced with small angles ∼1 mrad with respect to the proton’s incoming direction. The ratio of leading neutrons respect to deep inelastic scattering events and the cross section for this reaction has been measured. The energy and |t| distributions of the observed leading neutrons are compared to Monte Carlo predictions based on pion exchange and soft colour interaction.