Unitarity Triangle Without Semileptonic Decays
Abstract
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. Furthermore, improvements on the B -> tau nu branching ratio and on the lattice determination of f_Bs Bs^(1/2) can increase the effectiveness of this method significantly.
Keywords
Cite
@article{arxiv.0912.0002,
title = {Unitarity Triangle Without Semileptonic Decays},
author = {E. Lunghi and A. Soni},
journal= {arXiv preprint arXiv:0912.0002},
year = {2014}
}
Comments
6 pages, 5 figures, Inputs and numerics updated, References added, Conclusions unchanged