Leptonic flavor violations in the presence of an extra [ital Z]

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.2109· OSTI ID:7272936

Dutta, G; Joshipura, A S; Vijaykumar, K B ^[1]

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1. Theory Group, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009 (India)

Gauged extensions [SU(2)[sub [ital L]][direct product]U(1)[sub [ital Y]][direct product]U(1)[sub [ital X]]] of the standard SU(2)[sub [ital L]][direct product]U(1)[sub [ital Y]] model obtained without extending the fermion content of the model are studied. Models that are possible when U(1)[sub [ital X]] is identified with some combination of the family lepton numbers are systematically classified. Most of these contain flavor violations in the leptonic sector. These flavor violations are correlated to the mixing of the U(1)[sub [ital X]] gauge boson [ital Z][prime] with the ordinary [ital Z] in the models considered here. Detailed phenomenological implications of a typical model are discussed. Constraints on the [ital Z][prime] mass and the [ital Z]-[ital Z][prime] mixing following from (i) the observations at CERN LEP, (ii) rare processes such as [ital Z][r arrow][ital e][tau], and (iii) flavor-violating [tau] decays are presented. It is found that the constraints coming from the LEP allow rare processes such as [tau][r arrow][ital eee] at the level of the present limits on its branching ratio. Thus the future search could either improve on the existing LEP limits or would find such flavor-violating decays.

• OSTI ID: 7272936
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 50:3; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662120* -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662210 -- Specific Theories & Interaction Models
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
ELEMENTARY PARTICLES
FLAVOR
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LEPTON NUMBER
LIE GROUPS
MATHEMATICAL MODELS
MIXING
ORGANOLEPTIC PROPERTIES
PARTICLE MODELS
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
STANDARD MODEL
SU GROUPS
SU-2 GROUPS
SYMMETRY GROUPS
U GROUPS
U-1 GROUPS
UNIFIED GAUGE MODELS
VIOLATIONS
Z NEUTRAL BOSONS