Charged-Higgs effects in a new B -> D tau nu differential decay distribution

TL;DR

This paper proposes a new method to detect charged-Higgs effects in B meson decays by analyzing the differential distribution of the decay chain B -> D nu tau[-> pi nu], which can distinguish Standard Model from charged-Higgs contributions.

Contribution

It introduces a novel differential decay distribution analysis that enhances the sensitivity to charged-Higgs effects and CP violation in B -> D tau nu decays.

Findings

Differential distribution effectively discriminates between Standard Model and charged-Higgs effects.

Measurement of energies and angles can determine the charged-Higgs coupling and CP phase.

Updated form factors improve the accuracy of the decay analysis.

Abstract

We show that the decay mode B -> D tau nu is competitive with and complementary to B -> tau nu in the search for charged-Higgs effects. Updating the relevant form factors, we find that the differential distribution in the decay chain B -> D nu tau[-> pi nu] excellently discriminates between Standard-Model and charged-Higgs contributions. By measuring the D and pi energies and the angle between the D and pi three-momenta one can determine the effective charged-Higgs coupling including a possible CP-violating phase.