K/sub L/. --> mu. e in SU(2)/sub L/ x U(1) and SU(2)/sub L/ x SU(2)/sub R/ x U(1) models with large neutrino masses

Journal Article · Tue Nov 01 00:00:00 EST 1988 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.38.2841· OSTI ID:7086117

Langacker, P; Sankar, S U; Schilcher, K

The expectations for B(K/sub L/..--> mu..e) generated by massive neutrinos are studied in detail for the SU(2)/sub L/ x U(1) and SU(2)/sub L/ x SU(2)/sub R/ x U(1) models. The effects of Dirac and Majorana masses for the ordinary as well as for fourth-family and SU(2)/sub 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)/sub L/ x SU(2)/sub R/ x U(1) models, in which the right-handed quark mixing matrix U/sup R/ is arbitrary, as well as the special case of manifest or pseudomanifest left-right symmetry (U/sup R/ = U/sup L/ or U/sup L//sup */), and incorporate existing limits on the mass and mixing of the W/sub R/ and on U/sup R/. It is found that all plausible versions of the SU(2)/sub L/ x U(1) model lead to immeasurably small branching ratios. Branching ratios as large as 2 x 10/sup -13/ are allowed in the SU(2)/sub L/ x SU(2)/sub R/ x 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(K/sub L/..--> mu..e)less than or equal to10/sup -15/. .AE

• Research Organization: Deutsches Electronen-Synchrotron DESY, D-2000 Hamburg 52, Federal Republic of Germany
• OSTI ID: 7086117
• Journal Information: Phys. Rev. D; (United States), Vol. 38:9
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
KAONS NEUTRAL LONG-LIVED
LEPTONIC DECAY
NEUTRINOS
MASS
BRANCHING RATIO
CONFIGURATION MIXING
ELECTRONS
FLAVOR MODEL
LEPTON NUMBER
MUONS
QUARKS
SU-2 GROUPS
U-1 GROUPS
WEAK INTERACTIONS
BASIC INTERACTIONS
BOSONS
COMPOSITE MODELS
DECAY
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INTERACTIONS
KAONS
KAONS NEUTRAL
LEPTONS
LIE GROUPS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MESONS
PARTICLE DECAY
PARTICLE MODELS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARK MODEL
STRANGE MESONS
STRANGE PARTICLES
SU GROUPS
SYMMETRY GROUPS
U GROUPS
WEAK PARTICLE DECAY
645203* - High Energy Physics- Particle Interactions & Properties-Theoretical- Weak Interactions & Properties