Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for heavy neutrinos at CERN SPS   The phenomenology in the neutrino sector requires physics beyond the Standard
Model. One possibility is the existence of new massive leptonic states which
could be probed at the high intensity machines. The present results on heavy
neutral leptons from the study of kaon decays in flight with the NA48/2 and
NA62 experiments are presented and the future prospects for such searches at
CERN SPS are discussed.

5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat