Helicity dependence of the [nu][sub [ital e]] energy spectrum from the decay of unpolarized muons

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.49.5945· OSTI ID:7308361

Fetscher, W ^[1]

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1. Institut fuer Teilchenphysik (ITP), ETH Zuerich, CH-5232 Villigen (Switzerland)

The energy distribution for left- and right-handed [nu][sub [ital e]] from the decay of unpolarized [mu][sup +] has been calculated on the basis of the most general four-fermion interaction. The left-handed [nu][sub [ital e]] can be detected by the reaction [sup 12]C([nu][sub [ital e]],[ital e][sup [minus]])[sup 12]N (g.s.). A measurement of the total rate with an error of [lt]5% will improve present limits on the scalar coupling [ital g][sub [ital L][ital L]][sup [ital S]]. The energy distribution for a left-handed [nu][sub [ital e]] depends on the parameter [omega][sub [ital L]] which corresponds to the Michel parameter [rho] of the electron energy spectrum from muon decay. The standard model predicts [omega][sub [ital L]]=0. The new parameter [omega][sub [ital L]] can be determined with a precision of [Delta][omega][sub [ital L]]=0.026 for 100 events corresponding to [vert bar][ital g][sub [ital R][ital L]][sup [ital S]]+2[ital g][sub [ital R][ital L]][sup [ital T]][vert bar][le]0.37, where [ital g][sub [ital R][ital L]][sup [ital S]] and [ital g][sub [ital R][ital L]][sup [ital T]] represent scalar and tensor interactions with a left-handed [nu][sub [ital e]] and right-handed [bar [nu]][sub [mu]].

• OSTI ID: 7308361
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 49:11; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662110 -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
662370* -- Decays of Leptons-- (1992-)
663420 -- Lepton-Induced Reactions & Scattering-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
CARBON 12 TARGET
DECAY
ELECTRON NEUTRINOS
ELEMENTARY PARTICLES
ENERGY SPECTRA
FERMI INTERACTIONS
FERMIONS
HELICITY
INTERACTIONS
LEPTON REACTIONS
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MATTER
MUONS
MUONS PLUS
NEUTRINO REACTIONS
NEUTRINOS
NUCLEAR REACTIONS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
SCALARS
SPECTRA
STANDARD MODEL
TARGETS
TENSORS
UNIFIED GAUGE MODELS
WEAK INTERACTIONS