====== TTP03-18 Flavour SU(3) Symmetry in Charmless $B$ Decays ======
 
 
   <hidden TTP03-18  Flavour SU(3) Symmetry in Charmless $B$ Decays > QCD sum rules are used to estimate
 the flavour SU(3)-symmetry violation
 in   two-body B decays to pions and kaons.
 In  the factorizable amplitudes the
 SU(3)-violation  manifests itself in the ratio of
 the decay constants f_K/f_pi
 and in the differences between the B->K, B_s->K
 and B->pi form factors.
 These effects are calculated from the QCD two-point
 and light-cone sum rules, respectively, in terms
 of the strange quark mass and the ratio of
 the  strange and nonstrange quark-condensate densities.
 Importantly, QCD sum rules predict that
 SU(3) breaking in the heavy-to-light form factors
 can be substantial and
 does not vanish in the heavy-quark mass limit.
 Furthermore, we investigate the strange-quark mass dependence of
 nonfactorizable effects in the  B->K pi decay amplitudes.
 Taking into account these effects we estimate the accuracy of
 several SU(3)-symmetry relations between charmless B-decay
 amplitudes.
 </hidden>
|**Alexander Khodjamirian, Thomas Mannel, Martin Melcher ...**  | 
|**  Phys.Rev.  D68 114007 2003  **  |
| {{preprints:2003:ttp03-18.pdf|PDF}} {{preprints:2003:ttp03-18.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0308297|arXiv]]   |
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