Scalar-pseudoscalar interactions in neutrino-electron scattering

TL;DR

This paper investigates how scalar and pseudoscalar interactions affect neutrino-electron scattering, providing model-independent limits on these couplings and applying findings to constrain parameters in the type III two Higgs doublet model.

Contribution

It offers a phenomenological, model-independent analysis of scalar and pseudoscalar couplings in neutrino-electron scattering, deriving new constraints on Yukawa couplings in the type III two Higgs doublet model.

Findings

Derived new bounds on scalar and pseudoscalar couplings.

Established limits on Yukawa matrix elements in the type III two Higgs doublet model.

Demonstrated the potential of neutrino-electron scattering to probe new physics.

Abstract

Many extensions to the Standard Model imply the existence of new charged scalar Higgs bosons. We study the contribution of a general scalar or pseudoscalar coupling for the neutrino-electron scattering. We take a phenomenological approach in order to obtain model independent limits to the couplings that arise in this picture. We illustrate the reach of the constraints by studying the particular case of the type III two Higgs doublet model, where we have found new constraints to some elements of the Yukawa couplings mixing matrix ($|Y_{ee}| \leq 1 \times 10^{-1}$ and $|Y_{e\mu}| \leq 7\times10^{-2}$ at 90% CL).