A Realistic Technicolor Model from 150 TeV down

TL;DR

This work constructs a realistic technicolor framework with a high-energy cutoff $\Lambda=150$ TeV in which electroweak symmetry breaking arises from a minimal technicolor doublet and a walking-unified sector that links the third-generation quarks to technifermions down to $\mu_U=9$ TeV. Walking dynamics enhances higher-dimension operators, while a tunable four-fermion sector provides the needed fermion masses and mixings without large FCNCs; below $\mu_U$ the theory reduces to Minimal Technicolor with one light doublet, yielding manageable electroweak radiative corrections. A specific spectrum is predicted: heavy exotics around tens of TeV, a light MTC sector driving EW physics, and top-quark masses near $\mathcal{O}(100\ \text{GeV})$ achieved with about a 10% tuning of a scalar mass parameter. Overall, the model demonstrates a viable path to dynamical EW breaking that is consistent with precision constraints and offers a concrete mechanism for generating the observed fermion mass hierarchy.

Abstract

A realistic technicolor model is presented with the dynamics below $150$ TeV treated explicitly. Electroweak symmetry is broken by the condensates of a `minimal' doublet of technifermions. The new feature of the model is that the the third generation quarks are unified with the technifermions into multiplets of a walking gauge force down to a scale of $10$ TeV. The remaining quarks and leptons are not involved in this unification however. The walking dynamics enhances the higher dimension interactions which give the ordinary fermions their masses and mixing, while leaving flavor-changing neutral currents suppressed. Because the third generation quarks actually feel the walking force their masses can be much larger than those of the other quarks and the leptons. The only non-standard particles with masses below several TeV are the single doublet of technifermions, so electroweak radiative corrections are estimable and within experimental limits.