Measurement of the τ Lepton Polarization and R (D∗) in the Decay B →d∗τ- ν τ

(Belle Collaboration)

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484 Citations (Scopus)


We report the first measurement of the τ lepton polarization Pτ(D∗) in the decay B→D∗τ-ντ as well as a new measurement of the ratio of the branching fractions R(D∗)=B(B→D∗τ-ντ)/B(B→D∗-ν), where - denotes an electron or a muon, and the τ is reconstructed in the modes τ-→π-ντ and τ-→ρ-ντ. We use the full data sample of 772×106 BB pairs recorded with the Belle detector at the KEKB electron-positron collider. 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.

Original languageEnglish
Article number211801
JournalPhysical review letters
Issue number21
Publication statusPublished - 2017 May 26

Bibliographical note

Publisher Copyright:
© 2017 American Physical Society.

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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