Abstract
The net charge of final state hadrons in both the current and target fragmentation regions has been measured in 280 GeV/ c muon-proton scattering experiment. A clean kinematic separation of the two regions in the centre-of-mass rapidity is demonstrated. The dependence on x Bj of the mean net charges is found to be consistent with a large contribution of sea quarks at small x Bj and with the dominance of valence quarks at large x Bj thus giving clear confirmation of the quarck- parton model. It is also shown that the lending forward hadron has a high probability of containing the struck quark.
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