Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: FCNC portals to the dark sector   The most general basis of operators parametrizing a low-scale departure from
the SM particle content is constructed. The SM gauge invariance is enforced,
and operators of lowest dimensions are retained separately for a new light
neutral particle of spin 0, 1/2, 1, and 3/2. The basis is further decomposed
into couplings to the SM Higgs/gauge fields, to pairs of quark/lepton fields,
and to baryon/lepton number violating combinations of fermion fields. This
basis is then used to systematically investigate the discovery potential of the
rare FCNC decays of the K and B mesons with missing energy in the final state.
The most sensitive decay modes in the s to d, b to d, and b to s sectors are
identified and compared for each type of couplings to the new invisible state.

12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
2
The categories of this paper are: math