Exploring CP-violation, via heavy neutrino oscillations, in rare B meson decays at Belle II

TL;DR

This paper investigates the potential to observe CP-violation caused by heavy neutrino oscillations in rare B meson decays at Belle II, focusing on specific decay channels and parameter scenarios.

Contribution

It analyzes the feasibility of measuring CP-asymmetry in B meson decays mediated by nearly-degenerate Majorana heavy neutrinos at Belle II.

Findings

CP-asymmetry could be detectable under certain conditions.

Heavy neutrino mass and mixing parameters influence observability.

Realistic experimental conditions are identified for potential measurement.

Abstract

In this article we study the rare B-meson decay via two on-shell almost-degenerate Majorana Heavy Neutrinos, into two charged leptons and two pseudoscalar mesons ($B^{\pm} \to D^0 \ell^{\pm}_1 \ell^{\pm}_2 \pi^{\mp}$). We consider the scenario where the heavy neutrino masses are $\sim 2$ GeV and the heavy-light mixing coefficients are $|B_{\ell N}|^2 \sim 10^{-5}$, and evaluate the possibility to measure the CP-asymmetry at Belle II. We present some realistic conditions under which the asymmetry could be detected.