Abstract
In the interactions of 400 GeV/c protons with copper nuclei, a flux of prompt neutrinos is observed. The reactions produced by these neutrinos in our apparatus appear consistent with those of electron- and muon-neutrinos. The prompt neutrino fluxes are interpreted as being due to associated production and subsequent semileptonic decay of charmed hadrons. The prompt flux ratio\(\bar v_\mu /v_\mu = 0.46_{ - 0.16}^{ + 0.21} \) suggests a sizeable production of charmed baryons near the forward direction. The ratio of prompte −+e + toµ −+µ + event rates is 0.64 +0.22−0.15 , where unity is expected frome-μ universality.
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Supported by the Bundesministerium für Forschung und Technologie, Bonn, FRG.
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Abramowicz, H., de Groot, J.G.H., He, J.T. et al. Prompt neutrino production in a proton beam-dump experiment. Z. Phys. C - Particles and Fields 13, 179–189 (1982). https://doi.org/10.1007/BF01575770
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DOI: https://doi.org/10.1007/BF01575770