Dilepton production by neutrinos in the Fermilab 15-foot bubble chamber

Journal Article · Wed Jul 01 04:00:00 EDT 1981 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.24.7· OSTI ID:6333130

Ballagh, H C; Bingham, H H; Lawry, T; Lynch, G R; Lys, J; Orthel, J; Sokoloff, M D; Stevenson, M L; Yost, G P; Gee, D; Harigel, G; Huson, F R; Schmidt, E; Smart, W; Treadwell, E; Cence, R J; Harris, F A; Jones, M D; Parker, S I; Peters, M W ; Peterson, V Z; Stenger, V J; Burnett, T H; Fluri, L; Lubatti, H J; Moriyasu, K; Rees, D; Swider, G M; Yuldashev, B S; Wolin, E; Camerini, U; Fry, W; Loveless, R J; McCabe, P; Ngai, M; Reeder, D D

In an exposure of the Fermilab 15-foot neon-hydrogen bubble chamber to a quadrupole triplet neutrino beam, 49 ..mu../sup -/e/sup +/ and 14 ..mu../sup +/e/sup -/ events with e/sup + -/ momenta greater than 0.3 GeV/c have been observed, yielding ..mu..e rates per charged-current event of (0.73 +- 0.11)% and (1.1 +- 0.3)%, respectively. The ..mu../sup -/e/sup +/ 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 14 K/sup 0//sub S/, 2 ..lambda.., and 2 ..lambda../K/sup 0//sub S/ ambiguities, suggesting that the events are predominantly D-meson production and decay and that the ..lambda../sup +//sub c/..--> lambda..eX branching ratio is very small. The corrected numbers of neutral strange particles per ..mu../sup -/e/sup +/ and ..mu../sup +/e/sup -/ event are 1.2 +- 0.3 and 0.6/sup +0.6//sub -0.3/, respectively. Properties of the events, including strange-particle production, are compared to ..mu../sup - +/..mu../sup + -/ events in the same experiment and to a charm production and decay model, and good agreement is found, apart from a possible enhancement at approx.5--6 GeV/c/sup 2/ in the mass of the system recoiling against the ..mu../sup +/ in ..mu../sup +/e/sup -/ (and ..mu../sup +/..mu../sup -/) events. As reported previously, four events show short-lived-particle decays, and D-meson lifetime estimates are reevaluated using the final event sample. One ..mu../sup +/e/sup +/ and three ..mu../sup -/e/sup -/ events were observed. The ..mu../sup -/e/sup -/ events are consistent with background and lead to a ..mu../sup -/e/sup -//..mu../sup -/e/sup +/ ratio of less than 0.07 (90% confidence level) for e/sup + -/ 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.

• Research Organization: Department of Physics and Lawrence Berkeley Laboratory, University of California, Berkeley, Berkeley, California 94720
• OSTI ID: 6333130
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 24:1; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
BUBBLE CHAMBERS
CHARGED-CURRENT INTERACTIONS
CHARM PARTICLES
CHARMED MESON RESONANCES
D RESONANCES
D-1865 RESONANCES
DECAY
ELEMENTARY PARTICLES
ENERGY DEPENDENCE
ENERGY RANGE
FERMIONS
GAS TRACK DETECTORS
GEV RANGE
GEV RANGE 10-100
GEV RANGE 100-1000
HADRONS
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LEPTONS
LIFETIME
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
NEUTRINO-NUCLEON INTERACTIONS
PAIR PRODUCTION
PARTICLE DECAY
PARTICLE INTERACTIONS
POSTULATED PARTICLES
RADIATION DETECTORS
RESONANCE PARTICLES