A Composite Higgs Model with Minimal Fine-Tuning I.~The Large-N and Weak-technicolor Limit

TL;DR

This paper proposes a generalized composite Higgs model with minimal fine-tuning, employing extended technicolor and technicolor interactions, and analyzes its large-N limit where technicolor is weak, aiming to match observed top quark and Higgs boson masses.

Contribution

It introduces a new composite Higgs model with extended technicolor, analyzing its large-N limit to reduce fine-tuning and accommodate observed particle masses.

Findings

Large-N_{TC} and N_C limit analysis shows weak technicolor contribution.

Model predicts enhanced diboson and triboson production signals.

Potential to match top quark and Higgs boson masses with additional dynamics.

Abstract

We suggest a criterion to minimize the amount of fine-tuning in a composite Higgs model. The paradigm of this type of model is the top-condensate model of Bardeen, Hill and Lindner (BHL). Although "minimally fine-tuned", this model failed to account correctly for the masses of the top quark and the 125~GeV Higgs boson. We propose a generalization of the BHL model that employs finely-tuned extended technicolor (ETC) plus technicolor (TC) interactions. The additional freedom of this model may accommodate both m_t(173) and M_H(125). This paper studies the large-N_{TC} and N_C limit of this model in which technicolor is weak and does not contribute to electroweak symmetry breaking. Refinements including walking-TC dynamics and a renormalization group analysis of m_t and M_H will appear in a subsequent paper. A likely generic signal of this model is enhanced production of dibosons (W^+W^- and W^\pm Z^0) and tribosons (W^+W^- Z^0) via rho_T^{0,\pm} and omega_T decay.