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→D0⁢π-⁢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→D0⁢π-⁢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.
2018
Vossen, A.; Adachi, I.; Adamczyk, K.; Aihara, H.; Al Said, S.; Asner, D.  M.; Aulchenko, V.; Aushev, T.; Ayad, R.; Badhrees, I.; Bansal, V.; Beleño, C...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1250289
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