Dynamical symmetry breaking, CP violation, and a Higgs-like particle

TL;DR

This paper explores how a pseudoscalar particle resulting from dynamical symmetry breaking, when mixed with a heavier scalar and CP violation, can mimic the observed 125 GeV Higgs-like particle through altered production and decay characteristics.

Contribution

It introduces a model where a mostly pseudoscalar mixed state can resemble the Higgs boson, explaining experimental observations via CP violation and heavy quark effects.

Findings

Enhanced gluon-gluon production rate due to heavy quarks

The mixed state can appear scalar in angular distributions

Pseudoscalar couplings may be detectable in other processes

Abstract

A pseudoscalar associated with dynamical symmetry breaking can mix with a heavier scalar when CP is violated. We study how such a mixed state that is mostly pseudoscalar can resemble the observed 125 GeV particle. The production rate from $gg$ is enhanced by the new heavy quarks and this compensates for the reduced $WW$, $ZZ$ and $\gamma\gamma$ branching ratios. The particle can appear to be a scalar from angular distributions in $ZZ$ decay while its pseudoscalar couplings should become evident in other processes.