Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determining the Weak Phase $\gamma$ From Charged $B$ Decays   A quadrangle relation is shown to be satisfied by the amplitudes for $B^+ \to
\pi^0 K^+,~\pi^+ K^0,~\eta K^+$, and $\eta' K^+$. By comparison with the
corresponding relation satisfied by $B^-$ decay amplitudes, it is shown that
the relative phases of all the amplitudes can be determined up to discrete
ambiguities. Making use of an SU(3) relation between amplitudes contributing to
the above decays and those contributing to $B^{\pm} \to \pi^{\pm} \pi^0$, it is
then shown that one can determine the weak phase $\gamma \equiv {\rm Arg}
(V_{ub}^* V_{cb}/V_{us}^* V_{cs})$, where $V$ is the Cabibbo-Kobayashi-Maskawa
matrix describing the charge-changing weak interactions between the quarks
$(u,c,t)$ and $(d,s,b)$.

20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph