Unitarity Triangle Without Semileptonic Decays

Understand

Use of semi-leptonic decays has become standard in constraining the Unitarity Triangle.

• Bearing in mind that precise calculations of these are very challenging, we propose an entirely new approach.
• In particular the |Vcb| + epsilon_K constraint, which depends extremely sensitively on Vcb in the traditional method, is replaced by the interplay between epsilon_K, BR(B ->tau nu) and Delta M_Bs.
• It is found that even in this method tensions with the Standard Model persist at the ~1.8 sigma level.