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.

6 pages, 5 figures, Inputs and numerics updated, References added, Conclusions unchanged

References in corpus (11)

• Estimate of BR(B -> X_s gamma) at O(alpha_s^2)
• Measurement of $\boldmath {B_s^0}$ mixing parameters from the flavor-tagged decay
• Correlations among new CP violating effects in Delta F = 2 observables
• Neutral B Meson Mixing in Unquenched Lattice QCD
• Possible Indications of New Physics in Bd-mixing and in sin(2 beta) Determinations
• Charged-Higgs effects in a new B -> D tau nu differential decay distribution
• Neutral kaon mixing from 2+1 flavor Domain Wall QCD
• On the consistency between the observed amount of CP violation in the K- and Bd-systems within minimal flavor violation
• Unquenched determination of the kaon parameter B_K from improved staggered fermions
• Hints for the scale of new CP-violating physics from B-CP anomalies
• Light charged Higgs at the beginning of the LHC era

Cited by in corpus (19)

• B- and D-meson decay constants from three-flavor lattice QCD
• Update of $|V_{cb}|$ from the $\bar{B}\to D^{\ast }\ell \bar{\nu }$ form factor at zero recoil with three-flavor lattice QCD
• Possible evidence for the breakdown of the CKM-paradigm of CP-violation
• Continuum Limit of $B_K$ from 2+1 Flavor Domain Wall QCD
• Delta F = 2 observables and B -> X_q gamma decays in the Left-Right Model: Higgs particles striking back
• Determining weak phases from B->J/Psi P decays
• Two Higgs doublets with 4th generation fermions - models for TeV-scale compositeness
• Neutral B-meson mixing from three-flavor lattice QCD: Determination of the SU(3)-breaking ratio ξ
• Constraining the mixing matrix for Standard Model with four generations: time dependent and semi-leptonic CP asymmetries in $B_d^0$, $B_s$ and $D^0$
• Neutral $B$ mixing from 2+1 flavor lattice-QCD: the Standard Model and beyond
• Emerging lattice approach to the K-Unitarity Triangle
• Texture Zeros for the Standard Model Quark Mass Matrices
• Five Texture Zeros and CP violation for the SM Quark Mass Matrices
• Demise of CKM & its aftermath
• Matching lattice and continuum four-fermion operators with nonrelativistic QCD and highly improved staggered quarks
• The Need for New Search Strategies for Fourth Generation Quarks at the LHC
• Calculating B-meson decay constants using domain-wall light quarks and nonperturbatively tuned relativistic b-quarks
• Neutral B mixing from 2+1 flavor lattice QCD
• Penguin contributions to B to J/Psi P Decays