Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cross-section and polarization of neutrino-produced $\tau$'s made simple   Practical formulae are derived for the cross-section and polarization of the
$\tau$ lepton produced in deep-inelastic neutrino-nucleon scattering in the
frame of the simple quark-parton model.

1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con