Massive Right-handed Neutrinos in B Decays

TL;DR

This paper explores how massive right-handed neutrinos could explain anomalies in B decay asymmetries and provides predictions for angular observables to guide future experiments.

Contribution

It introduces a framework for analyzing B decays with massive right-handed neutrinos and links these effects to observed asymmetry differences.

Findings

Massive RH neutrinos can account for positive $ ext{A}_{ ext{FB}}$ differences.

Predictions for $q^2$ dependent angular observables are provided.

The framework explains anomalies in Belle data.

Abstract

In this paper, we present the differential decay distributions for $\bar B \to D^{(*)} \ell \bar{X}$ decays with a massive right-handed neutrino in the low-energy effective field theory framework and show how the massive effects of the RH neutrinos can explain the positive value of the difference in forward-backward asymmetries, $\Delta A_{\text{FB}}\equiv A_{\text{FB}}^\mu-A_{\text{FB}}^e$, tentatively inferred from Belle data. We also make predictions for $q^2$ dependent angular observables to motivate future measurements.