Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Expectation values of flavor-neutrino numbers with respect to
  neutrino-source hadron states --Neutrino oscillations and decay
  probabilities--   On the basis of quantum field theory, we consider a unified description of
various processes accompanied by neutrinos, namely weak decays and oscillation
processes. The structures of the expectation values of flavor-neutrino numbers
with respect to neutrino-source hadron state are investigated. Due to the
smallness of neutrino masses, we naturally obtain the old (i.e. pre-mixing)
formulas of decay probabilities. Together, it is shown that the oscillation
formulas, similar to the usual ones, are applied irrespectively of the details
of neutrino-producing processes. The derived oscillation formulas are the same
in form as the usually used ones except for the oscillation length.

27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
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
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph