TY - JOUR
T1 - KLe in SU(2)L×U(1) and SU(2)L×SU(2)R×U(1) models with large neutrino masses
AU - Langacker, Paul
AU - Sankar, S. Uma
AU - Schilcher, K.
N1 - Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1988
Y1 - 1988
N2 - The expectations for B(KLe) generated by massive neutrinos are studied in detail for the SU(2)L×U(1) and SU(2)L×SU(2)R×U(1) models. The effects of Dirac and Majorana masses for the ordinary as well as for fourth-family and SU(2)L-singlet (right-handed) neutrinos are considered, taking into account all existing laboratory and cosmological constraints on the neutrino masses and mixings, as well as plausible (i.e., not requiring extreme fine-tuning) expectations for mixing between light and heavy neutrinos. We consider general SU(2)L×SU(2)R×U(1) models, in which the right-handed quark mixing matrix UR is arbitrary, as well as the special case of manifest or pseudomanifest left-right symmetry (UR=UL or UL*), and incorporate existing limits on the mass and mixing of the WR and on UR. It is found that all plausible versions of the SU(2)L×U(1) model lead to immeasurably small branching ratios. Branching ratios as large as 2×10-13 are allowed in the SU(2)L×SU(2)R×U(1) model, but only for tiny corners of parameter space. For most parameter values (including manifest and pseudomanifest left-right symmetry) one has B(KLe)*10-15. AE
AB - The expectations for B(KLe) generated by massive neutrinos are studied in detail for the SU(2)L×U(1) and SU(2)L×SU(2)R×U(1) models. The effects of Dirac and Majorana masses for the ordinary as well as for fourth-family and SU(2)L-singlet (right-handed) neutrinos are considered, taking into account all existing laboratory and cosmological constraints on the neutrino masses and mixings, as well as plausible (i.e., not requiring extreme fine-tuning) expectations for mixing between light and heavy neutrinos. We consider general SU(2)L×SU(2)R×U(1) models, in which the right-handed quark mixing matrix UR is arbitrary, as well as the special case of manifest or pseudomanifest left-right symmetry (UR=UL or UL*), and incorporate existing limits on the mass and mixing of the WR and on UR. It is found that all plausible versions of the SU(2)L×U(1) model lead to immeasurably small branching ratios. Branching ratios as large as 2×10-13 are allowed in the SU(2)L×SU(2)R×U(1) model, but only for tiny corners of parameter space. For most parameter values (including manifest and pseudomanifest left-right symmetry) one has B(KLe)*10-15. AE
UR - http://www.scopus.com/inward/record.url?scp=4243614009&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4243614009&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.38.2841
DO - 10.1103/PhysRevD.38.2841
M3 - Article
AN - SCOPUS:4243614009
SN - 1550-7998
VL - 38
SP - 2841
EP - 2850
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
IS - 9
ER -