Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High energy neutrino absorption by W production in a strong magnetic
  field   An influence of a strong external magnetic field on the neutrino self-energy
operator is investigated. The width of the neutrino decay into the electron and
W boson, and the mean free path of an ultra-high energy neutrino in a strong
magnetic field are calculated. A kind of energy cutoff for neutrinos
propagating in a strong field is defined.

31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
18
The categories of this paper are: econ