TY - JOUR
T1 - Left-right mixing on leptonic and semileptonic b → u decays
AU - Chen, Chuan Hung
AU - Nam, Soo hyeon
N1 - Funding Information:
This work is supported in part by the National Science Council of R.O.C. under Grant No. NSC-95-2112-M-006-013-MY2.
PY - 2008/9/11
Y1 - 2008/9/11
N2 - 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%.
AB - 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%.
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U2 - 10.1016/j.physletb.2008.07.095
DO - 10.1016/j.physletb.2008.07.095
M3 - Article
AN - SCOPUS:51749124050
SN - 0370-2693
VL - 666
SP - 462
EP - 466
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 5
ER -