Can lepton number violating interactions affect the LSND results?

Technical Report · Tue Oct 06 00:00:00 EDT 1998

DOI:https://doi.org/10.2172/9924· OSTI ID:9924

Grossman, yuval ^[1]

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1. SLAC

If the atmospheric and the solar neutrino problem 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 +} --> e{sup +}anti-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 -->3e, muonium-antimuonium conversion and tau --> mu e e rule out any observable effect for the present experiments due to mu{sup +} --> e{sup +} n u{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 ''oscillation signals'' observed at LSND are due to flavor-changing interactions that conserve total lepton number.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 9924
• Report Number(s): SLAC-PUB-7950
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DECAY
LEPTON NUMBER
LEPTONS
MUONS
NEUTRINO OSCILLATION
NEUTRINOS
PHYSICS
PRODUCTION
SOLAR NEUTRINOS