Negative [delta][rho] with four families in the standard model

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

DOI:https://doi.org/10.1103/PhysRevD.50.2082· OSTI ID:7080547

Hung, P Q; McCoy, R; Singleton, D ^[1]

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1. Department of Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)

The possible consequences of heavy, fourth generation fermion, vector-meson'' bound states, formed by the exchange of the Higgs boson, are discussed. In particular, it is suggested that such bound states could make negative contributions to the [rho] parameter, thereby loosening the perturbative constraint upon the mass of the top quark and/or the masses, mass splittings, and other characteristics of a potential fourth generation of heavy fermions. Phenomenological implications such as monojet'' events, coming from the decay of a heavy neutral lepton in [ital Z][r arrow][ital [bar N]][nu][sub [tau]]+[ital N][bar [nu]][sub [tau]], as well as their correlations to the flavor-changing decay [ital Z][r arrow][ital [bar b]s]+[ital b[bar s]] are also discussed. The analysis also extends to the standard model with two Higgs doublets.

• DOE Contract Number: AS05-89ER40518
• OSTI ID: 7080547
• 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

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSON-EXCHANGE MODELS
BOSONS
BOUND STATE
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HIGGS BOSONS
LEPTONS
MASS
MASS DIFFERENCE
MATHEMATICAL MODELS
MESONS
NEUTRAL PARTICLES
PARTICLE MODELS
PARTICLE PROPERTIES
PARTICLES
PERIPHERAL MODELS
POSTULATED PARTICLES
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
STANDARD MODEL
TOP PARTICLES
UNIFIED GAUGE MODELS
VECTOR MESONS