The status of the quark mixing in weak interaction is reviewed. The 3× 3 quark mixing matrix
for the three left-handed doublet model is analyzed using various experimental information …

Abstract Models with non-minimal Higgs sectors represent a mainstream direction in
theoretical exploration of physics opportunities beyond the Standard Model. Extended scalar …

A unified model of strong and electro-weak interactions based on the exceptional group E6
is presented, with three generations of fermions and all the symmetry breaking obtained …

Abstract We consider SU (2)× U (1) gauge models with an additional global symmetry of S n
type. In particular, we study S 4 symmetry for a six-quark—six-lepton standard model. We …

In extensions of the Standard Model with two Higgs doublets, flavor-changing Yukawa
couplings of the neutral scalars may be present at tree level. In this work, we consider the …

The most general left-right symmetry for SU (2) L× SU (2) R× U (1) gauge theories with any
number of flavours and with at most two scalar multiplets transforming as qq bilinears is …

We study experimental and theoretical constraints which can prevent the introduction of
horizontal gauge ssymmetries. To allow for the possibility of dynamical symmetry breaking …

We point out a conflict between the requirement of natural flavour conservation in the neutral
currents and the possibility of determining the generalized Cabibbo angles as a function of …

An approach to gauge theory in the context of locally conformally flat space–time is
described. It is discussed how there are a number of natural principal bundles associated …

If a gauge group without left-right symmetry is supplemented by a finite group D of discrete
transformations in order to get a relation between the Cabibbo angle and the masses I show …