Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-linear field theory for lepton and quark masses   Barut's formula for the mass of leptons is successfully extended to quarks. A
very simple non-linear scalar field model explains both the N^4 power law
dependence of the mass, and the existence of a cut-off which limits the number
of leptons to three and the number of quarks to five, suggesting that the mass
of the sixth quark is of different origin.

10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph