Can lepton flavor violating interactions explain the LSND results?

Journal Article · Sat May 01 04:00:00 EDT 1999 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.59.093005· OSTI ID:347069

Bergmann, S ^[1]; Grossman, Y ^[2]

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1. Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100 (Israel)
2. Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States)

If the atmospheric and the solar neutrino problems are both explained by neutrino oscillations, and if there are only three light neutrinos, then all mass-squared differences between the neutrinos are known. In such a case, existing terrestrial neutrino oscillation experiments cannot be significantly affected by neutrino oscillations, but, in principle there could be an anomaly in the neutrino flux due to new neutrino interactions. We discuss how a non-standard muon decay {mu}{sup +}{r_arrow}e{sup +}{bar {nu}}{sub e}{nu}{sub l} would modify the neutrino production processes of these experiments. Since SU(2){sub L} violation is small for new physics above the weak scale one can use related flavor-violating charged lepton processes to constrain these decays in a model independent way. We show that the upper bounds on {mu}{r_arrow}3e, muonium-antimuonium conversion and {tau}{r_arrow}{mu}e e rule out any observable effect for the present experiments due to {mu}{sup +}{r_arrow}e{sup +}{bar {nu}}{sub e}{nu}{sub l} for l=e,{mu},{tau}, respectively. Applying similar arguments to flavor-changing semi-leptonic reactions we exclude the possibility that the {open_quotes}oscillation signals{close_quotes} observed at LSND are due to flavor-changing interactions that conserve total lepton number. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 347069
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 9 Vol. 59; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CONSERVATION LAWS
EARTH ATMOSPHERE
FLAVOR MODEL
LEPTON NUMBER
MUONIUM
MUONS
NEUTRINO OSCILLATION
SOLAR NEUTRINOS
SU-2 GROUPS
TAU PARTICLES