Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oscillation of heavy sterile neutrino in decay of $B \to \mu e \pi$   In a scenario with two almost mass degenerate heavy sterile Majorana
neutrinos with a mass $\sim 1$ GeV, we present the semileptonic decay widths of
heavy charged pseudoscalars such as $B$ mesons, either lepton-number-violating
($B^{\pm} \to \mu^{\pm} e^{\pm} \pi^{\mp}$), or lepton-number-conserving
($B^{\pm} \to \mu^{\pm} e^{\mp} \pi^{\pm}$), mediated by such on-shell
neutrinos. It had been explained in the literature that such decays may be
eventually detected, and that they can present even detectable CP violation
effects. In this work we point out that, in addition, such decays may present
detectable effects of heavy neutrino oscillation, allowing us to extract the
oscillation length and thus the heavy neutrino mass difference $\Delta M_N$, as
well as a CP-violating Majorana phase.

31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph