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

Abstract

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../supmore » +/..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.« less

Authors:
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Publication Date:
Research Org.:
Department of Physics and Lawrence Berkeley Laboratory, University of California, Berkeley, Berkeley, California 94720
OSTI Identifier:
6333130
Resource Type:
Journal Article
Journal Name:
Phys. Rev. D; (United States)
Additional Journal Information:
Journal Volume: 24:1
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; LEPTONS; PAIR PRODUCTION; NEUTRINO-NUCLEON INTERACTIONS; BRANCHING RATIO; BUBBLE CHAMBERS; CHARGED-CURRENT INTERACTIONS; D-1865 RESONANCES; ENERGY DEPENDENCE; GEV RANGE 10-100; GEV RANGE 100-1000; LIFETIME; PARTICLE DECAY; BOSONS; CHARM PARTICLES; CHARMED MESON RESONANCES; D RESONANCES; DECAY; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; GAS TRACK DETECTORS; GEV RANGE; HADRONS; INTERACTIONS; LEPTON-BARYON INTERACTIONS; LEPTON-HADRON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; MEASURING INSTRUMENTS; MESON RESONANCES; MESONS; PARTICLE INTERACTIONS; POSTULATED PARTICLES; RADIATION DETECTORS; RESONANCE PARTICLES; 645102* - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties

Citation Formats

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, and Reeder, D D. Dilepton production by neutrinos in the Fermilab 15-foot bubble chamber. United States: N. p., 1981. Web. doi:10.1103/PhysRevD.24.7.
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. Dilepton production by neutrinos in the Fermilab 15-foot bubble chamber. United States. https://doi.org/10.1103/PhysRevD.24.7
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, and Reeder, D D. Wed . "Dilepton production by neutrinos in the Fermilab 15-foot bubble chamber". United States. https://doi.org/10.1103/PhysRevD.24.7.
@article{osti_6333130,
title = {Dilepton production by neutrinos in the Fermilab 15-foot bubble chamber},
author = {Ballagh, H C and Bingham, H H and Lawry, T and Lynch, G R and Lys, J and Orthel, J and Sokoloff, M D and Stevenson, M L and Yost, G P and Gee, D and Harigel, G and Huson, F R and Schmidt, E and Smart, W and Treadwell, E and Cence, R J and Harris, F A and Jones, M D and Parker, S I and Peters, M W and Peterson, V Z and Stenger, V J and Burnett, T H and Fluri, L and Lubatti, H J and Moriyasu, K and Rees, D and Swider, G M and Yuldashev, B S and Wolin, E and Camerini, U and Fry, W and Loveless, R J and McCabe, P and Ngai, M and Reeder, D D},
abstractNote = {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.},
doi = {10.1103/PhysRevD.24.7},
url = {https://www.osti.gov/biblio/6333130}, journal = {Phys. Rev. D; (United States)},
number = ,
volume = 24:1,
place = {United States},
year = {1981},
month = {7}
}