We propose a new method for the precise determination of |Vtd/Vub| from the ratios of branching ratios B(B→ρνν̄)/B(B→ρlν) and B(B→πνν̄)/B(B→πlν). These ratios depend only on the ratio of the Cabibbo-Kobayashi-Maskawa (CKM) elements |Vtd/Vub| with little theoretical uncertainty, when very small isospin breaking effects are neglected. As is well known, |Vtd/Vub| equals (sin γ/sin β) for the CKM version of CP violation within the standard model. We also give in detail analytical and numerical results on the differential decay width dΓ(B→K*νν̄)/dq2 and the ratio of the differential rates dB(B→ρνν̄)/dq2/ dB(B→K*νν̄)/dq2 as well as B(B→ρνν̄)/B(B→K*νν̄) and B(B→πνν̄)/B(B→Kνν̄).
|Number of pages||5|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 1998 Jul 1|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)