Abstract
We study diagonal and transition quark dipole operators in a class of extended technicolor (ETC) models, taking account of the multiscale nature of the ETC gauge symmetry breaking and of the mixing among ETC interaction eigenstates. Because of this mixing, terms involving the lowest ETC scale can play an important role in dipole operators, and we focus on these terms. We derive from experiment new correlated constraints on the quark mixing angles and phases. Our bounds yield information on mixing angles individually in the up- and down-sectors, for both left- and right-handed quark fields and thus constrain even quark mixing parameters that do not enter in the CKM matrix. With phases of order unity, we conclude that these mixing angles are small, constraining future ETC model building, but plausibly in the range suggested by the size of the CKM elements. These values still allow substantial deviations from the standard model predictions, in particular for several CP violating quantities, including the asymmetries in b→sγ and Bd→ϕKS, Re(ε′/ε), and the electric dipole moments of the neutron and the 199Hg atom.
Highlights
Extended technicolor (ETC) provides a framework [1] for the generation of fermion masses in theories of dynamical electroweak symmetry breaking
In this paper we study diagonal and transition quark magnetic and electric, and chromomagnetic and chromoelectric, dipole moments in a class of ETC models [2]- [6], taking account of the multiscale nature of the ETC gauge symmetry breaking, and mixing between ETC interaction eigenstates to form mass eigenstates for the fermions and gauge bosons
We have described previously [6,7] how the mass matrix M (f) and dipole matrix D (f) are estimated from an underlying ETC theory and have noted how they are related in the presence of the mixing of ETC interaction eigenstates to form mass eigenstates of the fermions and gauge bosons
Summary
Extended technicolor (ETC) provides a framework [1] for the generation of fermion masses in theories of dynamical electroweak symmetry breaking. In this paper we study diagonal and transition quark magnetic and electric, and chromomagnetic and chromoelectric, dipole moments in a class of ETC models [2]- [6], taking account of the multiscale nature of the ETC gauge symmetry breaking, and mixing between ETC interaction eigenstates to form mass eigenstates for the fermions and gauge bosons. The electroweak symmetry breaking scale, the effective theory consists of the SM interactions, mass terms for the quarks, charged leptons, and neutrinos, and a tower of higher-dimension operators generated by the underlying ETC dynamics. In a companion paper [9], we discuss the impact of dimension-6 operators
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