Probing sterile neutrino in $B$ ($D$) meson decays at Belle II (BESIII)

C. S. Kim, Youngjoon Kwon, Donghun Lee +2

We present, how a systematic study of $B\to D\ell N$ ($D\to K\ell N$) decays with $\ell =\mu ,\tau$, at Belle II (BESIII) can provide unambiguous signature of a heavy neutrino $N$ and/…