Revising limits on neutrino-Majoron couplings

Journal Article · Tue May 01 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.094001· OSTI ID:21020473

Lessa, A P; Peres, O L. G. ^[1]

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1. Instituto de Fisica Gleb Wataghin-UNICAMP, 13083-970 Campinas SP (Brazil)

Any theory that has a global spontaneously broken symmetry will imply the existence of very light neutral bosons or massless bosons (sometimes called Majorons). For most of these models we have neutrino-Majoron couplings that appear as additional branching ratios in decays of mesons and leptons. Here we present an updated limit on the couplings between the electron, muon, and tau neutrinos and Majorons. For such we analyze the possible effects of Majoron emission in both meson and lepton decays. In the latter we also include an analysis of the muon decay spectrum. Our results are |g{sub e{alpha}}|{sup 2}<5.5x10{sup -6}, |g{sub {mu}}{sub {alpha}}|{sup 2}<4.5x10{sup -5} and |g{sub {tau}}{sub {alpha}}|{sup 2}<5.5x10{sup -2} at 90% C. L., where {alpha}=e, {mu}, {tau}.

• OSTI ID: 21020473
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
COUPLING
ELECTRON NEUTRINOS
ELECTRONS
MESONS
MUON NEUTRINOS
MUONS
PARTICLE DECAY
REST MASS
SYMMETRY BREAKING
TAU NEUTRINOS