An analysis of a minimal vectorlike extension of the Standard Model

TL;DR

This paper explores a minimal extension of the Standard Model involving an additional hypercolor gauge group, analyzing its implications for Higgs physics, symmetry breaking, and potential collider signatures.

Contribution

It introduces a vectorlike hypercolor extension with specific symmetry properties, detailing the construction of interactions and implications for pseudo-Nambu-Goldstone bosons.

Findings

Identification of stable neutral pseudoscalar due to symmetry

Analysis of collider signatures of lightest states

Explicit construction of vectorlike interactions

Abstract

We analyze an extension of the Standard Model with an additional SU(2) hypercolor gauge group keeping the Higgs boson as a fundamental field. Vectorlike interactions of new hyperquarks with the intermediate vector bosons are explicitly constructed. We also consider pseudo-Nambu--Goldstone bosons caused by the symmetry breaking SU(4)-> Sp(4). A specific global symmetry of the model with zero hypercharge of the hyperquark doublets ensures the stability of a neutral pseudoscalar field. Some possible manifestations of the lightest states at colliders are also examined.