Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extraction of gamma   After a brief look at the well-known standard approaches to determine the
angle gamma of the unitarity triangle, we focus on two kinds of strategies,
employing $B\to\pi K$ modes, and U-spin-related B decays. Interesting
"puzzles", which may already be indicated by the present B-factory data, are
pointed out, and the importance of the extraction of hadronic parameters, which
are provided by these strategies as by-products, is emphasized.

37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga