Unitarity Triangle without Semileptonic Decays

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Abstract
The use of semileptonic decays has become standard in constraining the unitarity triangle. Since precise calculations of these are very challenging, we propose an entirely new approach. The $\epsilon${}K constraint, which depends extremely sensitively on |Vcb|, is replaced by the interplay between $\epsilon${}K, BR(B$\rightarrow${}$\tau${}$\nu${}), and $\Delta${}MBs. Improvements on the B$\rightarrow${}$\tau${}$\nu${} branching ratio and on the lattice determinations of fBsB^s1/2 and fB can increase the effectiveness of this method significantly.