Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charged Kaons at the Main Injector (CKM)   The CKM collaboration is proposing to measure the branching ratio of the rare
K decay (K+ --> pi+ nu nubar) at the Main Injector at Fermilab. Our goal is to
be able to observe about 100 events, for a Standard Model branching ratio of
about 1.0E-10. This implies that we must be able to reduce the background to a
few events.

19
The categories of this paper are: eess
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org