Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rare decays of the $B_s-$meson into four charged leptons in the
  framework of the Standard Model   In the framework of the Standard Model we present new theoretical predictions
for the branching ratios, double and single differential distributions and
forward -- backward leptonic asymmetries for the $\bar B_s \to \mu^+ \mu^- e^+
e^-$ decay. In our consideration we take into account the $\phi(1020)$ --
resonance contribution; the main contributions of four charmonium resonances :
$\psi(3770)$, $\psi(4040)$, $\psi(4160)$ and $\psi(4415)$; $u\bar{u}$ --
resonant contribution from $\rho(770)$ and $\omega(782)$; tails contributions
from $J/\psi$ and $\psi(2S)$ resonances; non -- resonant contribution of the
$b\,\bar{b}$ - pairs, bremsstrahlung and the contribution of the weak
annihilation. We provide the prediction for the branching ratio of $\bar B_s
\to \mu^+ \mu^- e^+ e^-$ decay with and without the $\phi(1020)$ -- resonance
contribution. We use the model of vector meson dominance (VMD) for calculation
of resonances contributions and take into account all substantive terms in
$\bar B_s \to \mu^+ \mu^- e^+ e^-$ amplitude that was not considered in the
previously papers.

9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int