Measurement of the branching ratio of B[over ¯]→D^{(*)}τ^{−}ν[over ¯]_{τ} relative to B[over ¯]→D^{(*)}ℓ^{-}ν[over ¯]_{ℓ} decays with hadronic tagging at Belle

Authors

M. Huschle et al., Belle Collaboration
D. Joffe, Kennesaw State UniversityFollow

Department

Physics

Document Type

Article

Publication Date

10-2015

Embargo Period

7-5-2018

Abstract

We report a measurement of the branching fraction ratios R(D(*)) of ¯B→D(*)τ−¯ντ relative to ¯B→D(*)ℓ−¯νℓ (where ℓ=e or μ) using the full Belle data sample of 772×106B¯B pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The measured values are R(D)=0.375±0.064(stat)±0.026(syst) and R(D∗)=0.293±0.038(stat)±0.015(syst). The analysis uses hadronic reconstruction of the tag-side B meson and purely leptonic τ decays. The results are consistent with earlier measurements and do not show a significant deviation from the standard model prediction.

Journal Title

Physical Review D

Journal ISSN

2470-0010

Volume

92

Issue

7

Digital Object Identifier (DOI)

10.1103/PhysRevD.92.072014

Comments

Preprint.

Also available at: https://doi.org/10.1103/PhysRevD.92.072014