Measurement of the τ lepton polarization and R (D∗) in the decay B ̄ →d∗τ- ν ̄ τ with one-prong hadronic τ decays at Belle MEASUREMENT of the τ LEPTON POLARIZATION ⋯ S. HIROSE et al.

The BELLE collaboration

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Abstract

With the full data sample of 772×106 BB̄ pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay B̄→D∗τ-ν̄τ 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(B̄→D∗τ-ν̄τ)/B(B̄→D∗-ν̄), where - 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.

Original languageEnglish
Article number012004
Number of pages17
JournalPhysical Review D
Volume97
Issue number1
DOIs
Publication statusPublished - 10 Jan 2018

Keywords

  • DISPERSIVE BOUNDS
  • MESON DECAYS
  • B-DECAYS
  • IDENTIFICATION
  • MODEL

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