Abstract
In an exposure of the Fermilab 15-foot neon-hydrogen bubble chamber to a quadrupole triplet neutrino beam, and events with momenta greater than 0.3 GeV/c have been observed, yielding rates per charged-current event of (0.73±0.11)% and (1.1±0.3)%, respectively. The rate shows no strong energy dependence in the range from 30 to 300 GeV. The 18 neutral strange particles observed in the 63 events contain , , and ambiguities, suggesting that the events are predominantly -meson production and decay and that the branching ratio is very small. The corrected numbers of neutral strange particles per and event are 1.2±0.3 and , respectively. Properties of the events, including strange-particle production, are compared to events in the same experiment and to a charm production and decay model, and good agreement is found, apart from a possible enhancement at ∼5-6 in the mass of the system recoiling against the in (and ) events. As reported previously, four events show short-lived-particle decays, and -meson lifetime estimates are reevaluated using the final event sample. One and three events were observed. The events are consistent with background and lead to a ratio of less than 0.07 (90% confidence level) for momenta above 0.8 GeV/c. Five candidates for dilepton production by electron neutrinos and antineutrinos in the beam are consistent with approximately 1% rates. No good three-lepton candidates were found, and one, previously reported, four-lepton candidate was found.
- Received 11 February 1981
DOI:https://doi.org/10.1103/PhysRevD.24.7
©1981 American Physical Society