Extrapolating Su(3) Breaking Effects from D to B Decays
نویسنده
چکیده
We consider two SU(3) breaking parameters, R1(mB) and R2(mB), appearing in a relation between B → Kπ and B → ππ amplitudes, which plays an important role in determining the weak phase γ. We identify an isospin-related quantity R2(mD) measured in D decays, exhibiting large SU(3) breaking which is likely due to nonfactorizable effects. With a cautious remark about possible nonfactorizable SU(3) breaking in B decays, we proceed to calculate factorizable SU(3) breaking corrections. Applying heavy quark symmetry to semileptonic D and B decay form factors, we find that SU(3) breaking in R2(mB)/R1(mB) may be significantly larger than estimated from certain model calculations of form factors. PACS codes: 12.15.Hh, 12.15.Ji, 13.25.Hw, 14.40.Nd
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