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Type: Artigo de periódico
Title: Revising limits on neutrino-Majoron couplings
Author: Lessa, AP
Peres, OLG
Abstract: 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 vertical bar g(e alpha)vertical bar(2)< 5.5x10(-6), vertical bar g(mu alpha)vertical bar(2)< 4.5x10(-5) and vertical bar g(tau alpha)vertical bar(2)< 5.5x10(-2) at 90% C. L., where alpha=e, mu, tau.
Country: EUA
Editor: American Physical Soc
Citation: Physical Review D. American Physical Soc, v. 75, n. 9, 2007.
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.75.094001
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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