We report a measurement of the branching fractions of the decays B→D(*)πℓν. The analysis uses 772×10^6 BB pairs produced in e+e-→Y(4S) data recorded by the Belle experiment at the KEKB asymmetric-energy e+e- collider. The tagging B meson in the decay is fully reconstructed in a hadronic decay mode. On the signal side, we reconstruct the decay B→D(*)πℓν(ℓ=e,μ). The measured branching fractions are B(B+→D−π+ℓ+ν)=[4.55±0.27 (stat.)±0.39 (syst.)]×10^−3, B(B0→D0π-ℓ+ν)=[4.05±0.36 (stat.)±0.41 (syst.)]×10^−3, B(B+→D*-π+ℓ+ν)=[6.03±0.43 (stat.)±0.38 (syst.)]×10^−3, and B(B0→D*0π-ℓ+ν)=[6.46±0.53 (stat.)±0.52 (syst.)]×10^−3. These are in good agreement with the current world-average values.
Measurement of the branching fraction of B→D⁽*⁾πℓν at Belle using hadronic tagging in fully reconstructed events
F. Tenchini;
2018-01-01
Abstract
We report a measurement of the branching fractions of the decays B→D(*)πℓν. The analysis uses 772×10^6 BB pairs produced in e+e-→Y(4S) data recorded by the Belle experiment at the KEKB asymmetric-energy e+e- collider. The tagging B meson in the decay is fully reconstructed in a hadronic decay mode. On the signal side, we reconstruct the decay B→D(*)πℓν(ℓ=e,μ). The measured branching fractions are B(B+→D−π+ℓ+ν)=[4.55±0.27 (stat.)±0.39 (syst.)]×10^−3, B(B0→D0π-ℓ+ν)=[4.05±0.36 (stat.)±0.41 (syst.)]×10^−3, B(B+→D*-π+ℓ+ν)=[6.03±0.43 (stat.)±0.38 (syst.)]×10^−3, and B(B0→D*0π-ℓ+ν)=[6.46±0.53 (stat.)±0.52 (syst.)]×10^−3. These are in good agreement with the current world-average values.File | Dimensione | Formato | |
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PhysRevD.98.012005.pdf
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