Measurement of the $\tau$ lepton polarization and $R(D^*)$ in the decay $\bar{B} \rightarrow D^* \tau^- \bar{\nu}_\tau$ with one-prong hadronic $\tau$ decays at Belle
By S. Hirose, T. Iijima, I. Adachi, K. Adamczyk, H. Aihara, S. Said, D. Asner, H. Atmacan, T. Aushev, R. Ayad and 174 more. 2017
182 citations recorded by the source corpus.
With the full data sample of 772×106 BB¯ pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay B¯→D*τ-ν¯τ is studied with the hadronic τ decays τ-→π-ντ and τ-→ρ-ντ. The τ polarization Pτ(D*) in two-body hadronic τ decays is measured, as well as the ratio of the branching fractions R(D*)=B(B¯→D*τ-ν¯τ)/B(B¯→D*l-ν¯l), where l- denotes an electron or a muon. Our results, Pτ(D*)=-0.38±0.51(stat)-0.16+0.21(syst) and R(D*)=0.270±0.035(stat)-0.025+0.028(syst), are consistent with the theoretical predictions of the standard model. The polarization values of Pτ(D*)>+0.5 are excluded at the 90% confidence level.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/d50004be45d6ff0175c2254f33af58b59b0dd130
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Citations in the corpus
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