Technicolor Models with Color-Singlet Technifermions and their Ultraviolet Extensions

TL;DR

This paper explores technicolor models with color-singlet technifermions, analyzing hypercharge restrictions, avoiding exotic charges, and discussing electroweak constraints and properties of extended theories.

Contribution

It provides a detailed analysis of hypercharge assignments and stability conditions in technicolor models with color-singlet fermions, including implications for extended technicolor theories.

Findings

Hypercharge restrictions for technifermions derived

Conditions to avoid stable exotic charged bound states identified

Electroweak constraints on these models discussed

Abstract

We study technicolor models in which all of the technifermions are color-singlets, focusing on the case in these fermions transform according to the fundamental representation of the technicolor gauge group. Our analysis includes a derivation of restrictions on the weak hypercharge assignments for the technifermions and additional color-singlet, technisinglet fermions arising from the necessity of avoiding stable bound states with exotic electric charges. Precision electroweak constraints on these models are also discussed. We determine some general properties of extended technicolor theories containing these technicolor sectors.