Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electroweak matrix elements at large Nc: matching quarks to mesons   I review some progress made on the problem of calculating electroweak
processes of mesons at low energy with the use of an approximation to large-Nc
QCD which we call the Minimal Hadronic Approximation. An update of results for
the matrix elements of the electroweak penguin operators Q7 and Q8 is also
given.

31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin