- η , η ′ Mixing in B → ππ
نویسنده
چکیده
An isospin analysis of B → ππ decays yields sin 2α, where α ≡ arg[−VtdV ∗ tb/(VudV ∗ ub)] and Vij is a CKM matrix element, without hadronic uncertainty if isospin is a perfect symmetry. Isospin, however, is broken not only by electroweak effects but also by the u and d quark mass difference. The latter drives π − η, η mixing and converts the isospin-perfect triangle relation between the B → ππ amplitudes to a quadrilateral. The combined isospin-violating effects impact the extracted value of sin 2α in a significant manner, particularly if the latter is small. PACS numbers: 11.30.Er, 11.30.Hv, 12.15.Hh, 13.20.He Typeset using REVTEX e-mail: [email protected]
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تاریخ انتشار 1999