Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Note on invisible decays of light mesons   A search for the invisible decays of $\omega$ and $\phi$ mesons in $J/\psi\to
\omega (\phi)\eta$ transitions has been performed by the BESIII Collaboration
very recently. Inspired by this experimental study, we compute the lowest order
contribution to branching ratios of ${\cal B}(V\to\bar{\nu}\nu)$ with $V$
denoting $\rho,\;\omega,\;\phi$, as the standard model background to these
invisible decays. Our predictions are far below the upper bounds given by the
BESIII experiment. We also analyze the $J/\psi\to
\eta(\eta^\prime)\bar{\nu}\nu$ processes, and estimate their decay rates.
Furthermore, the invisible decays of light pseudoscalar mesons $P$ including
$\pi^0$, $\eta$, and $\eta^\prime$ are reexamined in the present note. It is
shown that, due to the helicity suppression of the two-neutrino final state,
the standard model contributions to $P\to{\rm invisible}$ decays are dominated
by $P\to\bar{\nu}\nu \bar{\nu}\nu$ processes.

33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci