Tau longitudinal polarization in B -> D tau nu and its role in the search for charged Higgs boson

TL;DR

This paper investigates how measuring tau lepton polarization in B -> D tau nu decays can help identify the presence of charged Higgs bosons, offering a new probe in particle physics beyond the Standard Model.

Contribution

It establishes a relation between decay rate and tau polarization, highlighting the importance of polarization measurements in charged Higgs searches.

Findings

Tau polarization is sensitive to charged Higgs effects.

A specific relation between decay rate and tau polarization is derived.

Tau polarization measurements can enhance charged Higgs detection sensitivity.

Abstract

We study the longitudinal polarization of the tau lepton in B -> D tau nu decay. After discussing possible sensitivities of tau decay modes to the tau polarization, we examine the effect of charged Higgs boson on the tau polarization in B -> D tau nu. We find a relation between the decay rate and the tau polarization, and clarify the role of the tau polarization measurement in the search for the charged Higgs boson.