@article{c14caf22cee44e80882dca380c540eed,
title = "Suppression of lepton number violation mediated by ΔI = 0 mass fermions",
abstract = "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.",
author = "{del Aguila}, F. and Bowick, {M. J.}",
note = "Funding Information: Work supported in part by the U.S. Department of Energy under Contract No. DE-AS-05-81-ER40008. 1 On leave from Departament de Fisica Teodca, Universitat Autonoma de Barcelona, Bellaterra (Barcelona), Spain. 4:1 This corresponds to the addition of the fermion multiplets 5f and 5f to the minimal SU(5) GUT. Funding Information: We have benefitted from discussions with P. Ramond, P. Sikivie, M.K. Chase and J. Perez-Mercader and from the criticism of H. Georgi. One of us (F.A.) acknowledges the US-Spanish Joint Committee for Scientific and Technological Cooperation for a fellowship and both thank the Aspen Centre for Physics for its hospitality.",
year = "1982",
month = dec,
day = "16",
doi = "10.1016/0370-2693(82)90264-7",
language = "English (US)",
volume = "119",
pages = "144--150",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier",
number = "1-3",
}