Missing doublet model reexamined

The Insider-Outsider Model Reexamined

In this note we introduce different levels of decay in the Goyal, Galeotti and Kamphorst (GGK) insider-outsider model of network formation. First, we deal with situations where the amount of decay is sufficiently low to avoid superfluous connections in strict Nash networks and we examine the architectures of strict Nash networks. We show that centrality and small diameter are robust features of...

Dimension-six Proton Decays in the Modified Missing Doublet SU(5) Model

Dimension-five operators for nucleon decays are suppressed in the modified missing doublet (MMD) model in the supersymmetric SU(5) grand unification. We show that nonrenormalizable interactions decrease the unification scale in the MMD model which increases the nucleon decay rate of dimensionsix operators by a significant amount. We find that the theoretical lower bound on the proton life time ...

Gauge Model of Generation Nonuniversality Reexamined

A gauge model of generation nonuniversality proposed in 1981 is reexamined in the light of present precision electroweak measurements. Two necessary features of this model are that the τ lifetime should be longer than predicted by the standard model and that the ρ parameter measured at the Z peak should have an additional negative contribution. Both trends are noticeable in present data. A futu...

Simple Two Higgs Doublet Model

Partially composite 2-Higgs doublet model

In the extra dimensional scenarios with gauge fields in the bulk, the KaluzaKlein (KK) gauge bosons can induce Nambu-Jona-Lasinio (NJL) type attractive fourfermion interactions, which can break electroweak symmetry dynamically with accompanying composite Higgs fields. We consider a possibility that electroweak symmetry breaking (EWSB) is triggered by both a fundamental Higgs and a composite Hig...