Department

Physics

Document Type

Article

Publication Date

3-2018

Embargo Period

7-3-2018

Abstract

We report a measurement of the branching fraction of the decay B→D(∗)πℓν. The analysis uses 772×106 BB¯ pairs produced in e+e−→Υ(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+→D−π+ℓ+ν) = [4.55 ± 0.27 (stat.) ± 0.39 (syst.)]×10−3, (B0→D¯0π−ℓ+ν) = [4.05 ± 0.36 (stat.) ± 0.41 (syst.)]×10−3, (B+→D∗−π+ℓ+ν) = [6.03 ± 0.43 (stat.) ± 0.38 (syst.)]×10−3, and (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.

Journal

arXiv

Comments

Submitted to PRD.

Preprint.

Also found at: https://arxiv.org/abs/1803.06444

Included in

Physics Commons

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