%0 Journal Article %1 Lunghi2009Unitarity %A Lunghi, E. %A Soni, A. %D 2009 %K flavour %T Unitarity Triangle Without Semileptonic Decays %U http://arxiv.org/abs/0912.0002 %X 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 2 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.

@article{Lunghi2009Unitarity, 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 2 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.}}, added-at = {2019-02-23T22:09:48.000+0100}, archiveprefix = {arXiv}, author = {Lunghi, E. and Soni, A.}, biburl = {https://www.bibsonomy.org/bibtex/2765e8b2ed1f94df97b127d69490a12eb/cmcneile}, citeulike-article-id = {6283576}, citeulike-linkout-0 = {http://arxiv.org/abs/0912.0002}, citeulike-linkout-1 = {http://arxiv.org/pdf/0912.0002}, comment = {(private-note)Good motivation for improving f\_B and f\_Bs}, day = 30, eprint = {0912.0002}, interhash = {9fb1ffe8ec2ba57459172997dc421fef}, intrahash = {765e8b2ed1f94df97b127d69490a12eb}, keywords = {flavour}, month = nov, posted-at = {2009-12-02 11:00:16}, priority = {0}, timestamp = {2019-02-23T22:15:27.000+0100}, title = {{Unitarity Triangle Without Semileptonic Decays}}, url = {http://arxiv.org/abs/0912.0002}, year = 2009 }