[ital Z][prime], new fermions, and flavor-changing processes: Constraints on E[sub 6] models from [mu][r arrow][ital eee]

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.1240· OSTI ID:6438639

Nardi, E ^[1]

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1. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)

We study a new class of flavor-changing interactions, which can arise in models based on extended gauge groups (rank [gt]4) when new charged fermions are present together with a new neutral gauge boson. We discuss the cases in which the flavor-changing couplings in the new neutral current coupled to the [ital Z][prime] are theoretically expected to be large, implying that the observed suppression of neutral flavor-changing transitions must be provided by heavy [ital Z][prime] masses together with small [ital Z]-[ital Z][prime] mixing angles. Concentrating on E[sub 6] models, we show how the tight experimental limit on [mu][r arrow][ital eee] implies serious constraints on the [ital Z][prime] mass and mixing angle. We conclude that if the value of the flavor-changing parameters is assumed to lie in a theoretically natural range, in most cases the presence of a [ital Z][prime] much lighter than 1 TeV is unlikely.

• OSTI ID: 6438639
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 48:3; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Pa
QUANTUM FLAVORDYNAMICS
EXTENDED PARTICLE MODEL
ELECTRONS
LEPTONIC DECAY
MUONS
WEAK NEUTRAL CURRENTS
Z NEUTRAL BOSONS
ALGEBRAIC CURRENTS
BASIC INTERACTIONS
BOSONS
CURRENTS
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LEPTONS
MATHEMATICAL MODELS
NEUTRAL CURRENTS
PARTICLE DECAY
PARTICLE MODELS
QUANTUM FIELD THEORY
WEAK INTERACTIONS
WEAK PARTICLE DECAY
662210* - Specific Theories & Interaction Models
Particle Systematics- Unified Theories & Models- (1992-)
662430 - Properties of Leptons- (1992-)