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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

Hirose, Shigeki*; Tanida, Kiyoshi   ; Belle Collaboration*; 182 of others*

With the full data sample of $$772 times 10^6$$ $$B{bar B}$$ pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay $$bar{B} rightarrow D^* tau^- bar{nu}_tau$$ is studied with the hadronic $$tau$$ decays $$tau^- rightarrow pi^- nu_tau$$ and $$tau^- rightarrow rho^- nu_tau$$. The $$tau$$ polarization $$P_tau(D^*)$$ in two-body hadronic $$tau$$ decays is measured, as well as the ratio of the branching fractions $$R(D^{*}) = mathcal{B}(bar {B} rightarrow D^* tau^- bar{nu}_tau) / mathcal{B}(bar{B} rightarrow D^* ell^- bar{nu}_ell)$$, where $$ell^-$$ denotes an electron or a muon. Our results, $$P_tau(D^*) = -0.38 pm 0.51 {rm (stat)} ^{+0.21}_{-0.16} {rm (syst)}$$ and $$R(D^*) = 0.270 pm 0.035{rm (stat)} ^{+0.028}_{-0.025}{rm (syst)}$$, are consistent with the theoretical predictions of the Standard Model. The polarization values of $$P_tau(D^*) > +0.5$$ are excluded at the 90% confidence level.

Language

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English

Journal

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Physical Review D

Volume

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97

Number

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1

Pages

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p.012004_1 - 012004_17

Publication Year/Month

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2018/01

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Held date

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Patent information

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PDF

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AA2018-0508.pdf:1.3MB

Paper URL

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https://doi.org/10.1103/PhysRevD.97.012004

DOI for research data

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Keywords

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no keyword

Research Facility

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Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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高エネルギー加速器研究機構

Accesses

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- Accesses

InCites™

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Percentile:99.04

Category:Astronomy & Astrophysics

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