Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determination of weak phases $\phi_2$ and $\phi_3$ from $B\to
  \pi\pi,K\pi$ in the pQCD method   We look at two methods to determine the weak phases $\phi_2$ and $\phi_3$
from $B \to \pi\pi$ and $K\pi$ decays within the perturbative QCD approach. We
obtain quite interesting bounds on $\phi_2$ and $\phi_3$ from recent
experimental measurements in asymmetric B-factory: $55^o \leq \phi_2 \leq
100^o$ and $51^o \leq \phi_3 \leq 129^o$. Specially we predict the possibility
of large direct CP violation effect in $B^0 \to \pi^{+}\pi^{-}$ decay with
$A_{cp}^{dir}(B\to \pi^{+} \pi^{-})=(23\pm7)$ %.

37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int