Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: U(2) instantons and leptons   Anomalous quantisation of instantons allows non-trivial (anti) self-dual
configurations to exist for pure U(2) gauge theory in four-dimensional
Euclidean space-time and to be used as ground state of the model. Six left
fermions together with six right fermions and one complex scalar doublet
describe the largest possible vacuum. This structure is just enough to
represent the leptons and Higgs boson in the Standard Model.

31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat