Suppression of lepton number violation mediated by ΔI = 0 mass fermions

F. del Aguila, M. J. Bowick

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


We add a lepton doublet with ΔI = 0 mass M to the minimal Weinberg-Salam model. We then calculate the transition rate for μ → eγ for all M as a function of an arbitrary mixing parameter δ of order a normal lepton mass. For δ {less-than or approximate} 0.4 GeV, M can be as low as 20 GeV. We show that heavy gDI = 0 fermions decouple throught their highly but naturally suppressed mixing angles with normal fermions and not through diagrammatic cancellations. Models with heavy ΔI = 0 fermions evade the commonly used conditions for natural suppression of rare processes in gauge theories.

Original languageEnglish (US)
Pages (from-to)144-150
Number of pages7
JournalPhysics Letters B
Issue number1-3
StatePublished - Dec 16 1982
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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