Bubble-Chamber Study of Dimuon Production by Neutrinos Using the Phase-2 EMI and a Dichromatic Beam

摘要

The authors propose to examine in detail, using the 15-foot bubble chamber and an improved ('Phase II') EMI, the characteristics of 'dimuon' events produced by neutrinos. A light neon-hydrogen filling (30% neon atoms) provides adequate target mass, good track measurements, and high detection efficiency for photons and electrons. Thus e-(mu) and e-e dileptons, as well as dimuons, can be observed with good efficiency. They estimate a yield of 100 detected dimuons in a 200 K picture exposure. They assume 400 GeV operation, 1 x 10(sup 13) protons/pulse, and a two-horn dichromatic beam focusing 100 (+-) 10 GeV/c mesons. If dimuons are made by neutrinos (ge) 30 GeV, then the yield from this dichromatic beam is about half the yield from a wide-band beam. Knowledge of neutrino energy is important in dimuon analysis.