Neutrinos produced in the vicinity of hadronic collisions

Neutrinos from proton-copper collisions are observed, whose origin is either direct or due to the decay of short lived hadrons. The reactions produced by these neutrinos cannot be distinguished from those of electron and muon neutrinos in our apparatus. The production rate is approximately 0.4.10-4 of the pion production rate. The prompt flux ratio (νsub(e) + antiνsub(e))/(νsub(μ) + antiνsub(μ)) is somewhat less than unity, but not significantly so. The prompt flux ratio antiνsub(μ)/νsub(μ) is considerably smaller than one. This could be understood if charmed baryons were the dominant source of prompt neutrinos near the forward direction