Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The structure of the exact effective action and the quark confinement in
  MSSM QCD   An expression for the exact (nonperturbative) effective action of $N$=1
supersymmetric gauge theories is proposed, supposing, that all particles except
for the gauge bosons are massive. Analysis of its form shows, that instanton
effects in the supersymmetric theories can lead to the quark confinement. The
typical scale of confinement in MSSM QCD, calculated from the first principles,
is in agreement with the experimental data. The proposed explanation is quite
different from the dual Higgs mechanism.

27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph