Decay of the Higgs boson to $\tau^- \tau^+$ and non-Hermiticity of the Yukawa interaction

TL;DR

This paper explores the non-Hermitian nature of the Higgs boson's interaction with fermions, proposing a model that predicts observable effects such as fermion polarization asymmetries in decay processes.

Contribution

It introduces a non-Hermitian Yukawa interaction model for the Higgs-fermion coupling and analyzes its symmetry properties and potential experimental signatures.

Findings

Non-Hermitian Yukawa interaction leads to fermion polarization asymmetries.

Modified Dirac equation for non-Hermitian interactions is derived.

Potential observables in Higgs decay to tau pairs are proposed.

Abstract

The issue of Hermiticity of the Higgs boson interaction with fermions is addressed. A model for non-Hermitian Yukawa interaction is proposed and approximation of one fermion generation is considered. Symmetry properties of the corresponding $h f \bar{f}$ Lagrangian with respect to the discrete P, C and T transformations are analyzed, and the modified Dirac equation for the free fermion is studied. Longitudinal polarization of the fermions in the decay $h \to f \bar{f}$, which arises due to non-Hermiticity of the $h f \bar{f}$ interaction, is discussed. It is suggested to study effects of this non-Hermiticity in the decay $h \to \tau^- \tau^+ \to \mu^- {\bar \nu}_\mu \nu_\tau \, \mu^+ \nu_\mu {\bar \nu}_\tau$, for which observables (asymmetries) are constructed which take nonzero values for a non-Hermitian $h \tau^- \tau^+$ interaction. These asymmetries are analyzed for various configurations of the muon energies.