Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quark- and Gluon-Condensate Contributions to Penguin Four-Fermi
  Operators   The nonperturbative content of the QCD vacuum permits the occurrence of
QCD-vaccum condensate contributions to penguin amplitudes. We calculate the
dimension-4 $<m_q\bar qq>$ and $<\alpha_s G^2>$ contributions to the effective
Wilson coefficients for penguin four-Fermi operators, and discuss how such
contributions may contribute to nonleptonic B decays.

21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
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The categories of this paper are: quant-ph
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci