Measurement of the tau lepton polarization and R(D*) in the decay (B)over-bar -˃ D*tau(-)(nu)over-bar(tau) with one-prong hadronic tau decays at Belle
- Title
- Measurement of the tau lepton polarization and R(D*) in the decay (B)over-bar -˃ D*tau(-)(nu)over-bar(tau) with one-prong hadronic tau decays at Belle
- Author
- 천병구
- Keywords
- DISPERSIVE BOUNDS; MESON DECAYS; B-DECAYS; IDENTIFICATION; MODEL
- Issue Date
- 2018-01
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW D, v. 97, no. 1, Article no. 012004
- Abstract
- With the full data sample of 772 x 10(6) B (B) over bar pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay (B) over bar -> D+ tau(-)(nu) over bar (tau) is studied with the hadronic tau decays tau(-) -> pi(-)nu(tau) and tau(-) -> 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*) = B((B) over bar -> D*tau(-) (nu) over bar (tau))/B((B) over bar -> D*l(-) (nu) over bar (l),where l(-) denotes an electron or a muon. Our results, P-tau (D*) = - 0.38 +/- 0.51(stat)(+0.21)(-0.16) (syst) and R(D*) = 0.270 +/- 0.035(stat)(+0.028)(-0.025)(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.
- URI
- https://journals.aps.org/prd/abstract/10.1103/PhysRevD.97.012004https://repository.hanyang.ac.kr/handle/20.500.11754/117081
- ISSN
- 2470-0010; 2470-0029
- DOI
- 10.1103/PhysRevD.97.012004
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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