Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QCD factorisation and flavour symmetries illustrated in B_d,s -> KK
  decays   We present a new analysis of B_d,s -> KK modes within the SM, relating them
in a controlled way through SU(3)-flavour symmetry and QCD-improved
factorisation. We propose a set of sum rules for B_d,s -> K^0 \bar K^0
observables. We determine B_s -> KK branching ratios and CP-asymmetries as
functions of A_dir(B_d -> K^0 \bar K^0), with a good agreement with current
experimental measurements of CDF. Finally, we predict the amount of U-spin
breaking between B_d -> pi+ pi- and B_s -> K+K-.

4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin