TY - JOUR
T1 - Suppression of lepton number violation mediated by ΔI = 0 mass fermions
AU - del Aguila, F.
AU - Bowick, M. J.
N1 - 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.
PY - 1982/12/16
Y1 - 1982/12/16
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=25744458199&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=25744458199&partnerID=8YFLogxK
U2 - 10.1016/0370-2693(82)90264-7
DO - 10.1016/0370-2693(82)90264-7
M3 - Article
AN - SCOPUS:25744458199
SN - 0370-2693
VL - 119
SP - 144
EP - 150
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-3
ER -