Measuring |Vtd/Vub| (=sin γ/sin β within the SM) through B→Mνν̄ (M=π,K,ρ,K*) decays

T. M. Aliev, C. S. Kim

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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).

Original languageEnglish
Article number013003
Pages (from-to)130031-130035
Number of pages5
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number1
Publication statusPublished - 1998 Jul 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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