It has been known that there exists a disagreement emerged between the determination of | Vu b | from inclusive B → Xu ℓ ν decays and exclusive B → π ℓ ν decays. In order to solve the mismatch, we investigate the left-right (LR) mixing effects, denoted by ξu, in leptonic and semileptonic b → u decays. We find that the new interactions (V + A) × (V - A) induced via the LR mixing can explain the mismatch between the values of | Vu b | if Re (ξu) = - (0.14 ± 0.12). Furthermore, we also find that the LR mixing effects can enhance the branching fractions for B → τ ν and B → ρ ℓ ν decays by 30% and 17%, respectively, while reducing the branching fraction for B → γ ℓ ν decays by 18%.
|Number of pages||5|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2008 Sep 11|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics