Discrimination of Models Including Doubly Charged Scalar Bosons by Using Tau Lepton Decay Distributions

TL;DR

This paper proposes a method to distinguish different models involving doubly charged scalar bosons by analyzing tau lepton decay distributions, aiding in understanding neutrino mass generation mechanisms.

Contribution

It introduces a technique to differentiate Yukawa interactions of H^{--} using tau decay energy distributions, which can discriminate between models of neutrino mass origin.

Findings

Energy distributions of charged pions reveal Yukawa interaction types.

Method can distinguish models with different tau lepton couplings.

Potential to identify the nature of doubly charged scalar bosons.

Abstract

The doubly-charged scalar boson H^{--} is involved in several new physics models for generating neutrino masses. Depending on new physics models, H^{--} has the Yukawa interaction with a pair of left-handed charged leptons or a pair of right-handed ones. In this talk, we see that these two Yukawa interactions can be distinguished by measuring energy distributions of charged pions produced by decays of tau leptons if pair-produced H^{++} H^{--} can decay sufficiently into four charged leptons which involve one or two tau leptons. The information on the Yukawa interaction of H^{--} will help to discriminate models in which neutrino masses are generated.