A proton beam-dump experiment using the CHARM neutrino detector has been performed at the CERN SPS. We report the observation of events induced by prompt νμ neutrinos and confirm previous evidence for prompt electron neutrinos. The ratio of prompt (νe + νe) and (νμ+νμ) fluxes is found to be 0.48+/-0.12 (st atistical) +/- 0.10 (systematic), whereas a flux ratio of 1 is expected for charmed meson production and subsequent semileptonic decay. The νμ to νμ flux ratio obtained is 1.3-0.6+6. We also observe 54 +/- 19 (statistical) +/- 9 (systematic) promp t muonless events, with shower energy in the range from 2 to 20 GeV, in excess of electron and muon neutrino interactions expected from D and D meson decay.

Experimental Study of Prompt Neutrino Production in 400 GeV Proton-Nucleus Collisions

FERRONI, Fernando
1980

Abstract

A proton beam-dump experiment using the CHARM neutrino detector has been performed at the CERN SPS. We report the observation of events induced by prompt νμ neutrinos and confirm previous evidence for prompt electron neutrinos. The ratio of prompt (νe + νe) and (νμ+νμ) fluxes is found to be 0.48+/-0.12 (st atistical) +/- 0.10 (systematic), whereas a flux ratio of 1 is expected for charmed meson production and subsequent semileptonic decay. The νμ to νμ flux ratio obtained is 1.3-0.6+6. We also observe 54 +/- 19 (statistical) +/- 9 (systematic) promp t muonless events, with shower energy in the range from 2 to 20 GeV, in excess of electron and muon neutrino interactions expected from D and D meson decay.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12571/2046
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