AbstractIn 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 ($$B^{\pm } \rightarrow D^0 \ell ^{\pm }_1 \ell ^{\pm }_2 \pi ^{\mp }$$
B
±
→
D
0
ℓ
1
±
ℓ
2
±
π
∓
). We consider the scenario where the heavy neutrino masses are $$\sim 2$$
∼
2
GeV and the heavy-light mixing coefficients are $$|B_{\ell N}|^2 \sim 10^{-5}$$
|
B
ℓ
N
|
2
∼
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.