Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some Remarks on the Final State Interactions in $B\to \pi K$ Decays   Careful discussions are made on some points which are met in studying B decay
final state interactions, taking the $B^0\to \pi^+ K^-$ process as an example.
We point out that $\pi$--exchange rescatterings are not important, whereas for
$D^*$ and $D^{**}$ exchanges, since the $B^0\to D^+D_s^-$ decay has a large
branching ratio their contributions may be large enough to enhance the $B\to
\pi K$ branching ratio significantly.
  However our estimates fail to predict a large enhancement.

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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int