Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lepton number violation in D meson decay   The lepton number violating process can be induced by introducing a fourth
generation heavy Majorana neutrino, which is coupled to the charged leptons of
Standard Model. There have been many previous studies on the leptonic number
violating decay processes with this mechanism, we follow the trend to study the
process: $D \to K \ell \ell \pi$ with the same-sign dilepton final states. We
restrict ourself to certain neutrino mass regions, in which the heavy neutrino
could be on shell and the dominant contribution to the branching fraction comes
from the resonance enhanced effect. Applying the Narrow Width Approximation, we
found that upper limit for the branching fractions for $D^0 \to
K^-\ell^+\ell^+\pi^-$ are generally at the order of $10^{-10}$ to $10^{-9}$, if
we take the most stringent upper limit bound currently available in the
literature for the mixing matrix elements. We also provide the constrains,
which is competitive compared to the LNV B decays, on the mixing matrix element
$|V_{eN}|^2$ based on the upper limit of $D^0 \to K^- e^+ e^+ \pi^-$ estimated
from Monte-Carlo study at BESIII.

16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org