Muon decay: Measurement of the energy spectrum of the. nu. sub e as a novel precision test for the standard model

Journal Article · Mon Nov 09 04:00:00 EST 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.2758· OSTI ID:7030320

Fetscher, W ^[1]

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1. Institut fuer Mittelenergiephysik (IMP), Eidgenoessische Technische Hochschule Zuerich, CH-5232 Villigen PSI (Switzerland)

The energy distribution of the {nu}{sub {ital e}} from the decay of unpolarized {mu}{sup +} has been calculated on the basis of the most general four-fermion interaction. It depends on a parameter called {omega} which equals zero in the standard-model. It is shown that the recent measurement of the reaction {sup 12}C({nu}{sub {ital e}},{ital e}{sup {minus}}){sup 12}Ng.s. with {nu}{sub {ital e}} from {mu}{sup +} decay at rest not only yields the absorption cross section, but also independently determines {omega} with a precision of {Delta}{omega}=0.026 for 100 measured events. This corresponds to {vert bar}{ital g}{sub {ital L}{ital L}}{sup {ital S}}{vert bar}{le}0.37, where {ital g}{sub {ital L}{ital L}}{sup {ital S}} describes a scalar interaction with left-handed {mu} and {ital e} and right-handed neutrinos.

• OSTI ID: 7030320
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:19; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
CARBON 12 TARGET
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
FERMIONS
FIELD THEORIES
INELASTIC SCATTERING
INTERACTIONS
LEPTON REACTIONS
LEPTONIC DECAY
LEPTONS
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MUONS
NEUTRINO REACTIONS
NUCLEAR REACTIONS
PARAMETRIC ANALYSIS
PARTICLE DECAY
PARTICLE MODELS
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Particle Systematics-- Unified Theories & Models-- (1992-)
SCATTERING
SPECTRA
TARGETS
TESTING
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
V-A THEORY
WEAK INTERACTIONS
WEAK PARTICLE DECAY
WEINBERG-SALAM GAUGE MODEL