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Measurement of the tau Lepton Polarization and R(D*) in the Decay (B)over-bar -˃ D* tau(-) (v)over-bar(tau)

Title
Measurement of the tau Lepton Polarization and R(D*) in the Decay (B)over-bar -˃ D* tau(-) (v)over-bar(tau)
Author
천병구
Keywords
Physical Systems; Mesons
Issue Date
2017-05
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v. 118, no. 21, Article no. 211801
Abstract
We report the first measurement of the tau lepton polarization P-tau(D*) in the decay (B) over bar -> D* tau(-) (v) over bar (tau) as well as a newmeasurement of the ratio of the branching fractions R(D*) = B((B) over bar -> D* tau(-) (v) over bar (tau)) / B((B) over bar -> D* l(-) (v) over bar (l)), where l(-) denotes an electron or a muon, and the tau is reconstructed in the modes tau(-) -> pi(-) v(tau) and tau(-) -> rho(-) v(tau). We use the full data sample of 772 x 10(6) B (B) over bar pairs recorded with the Belle detector at the (KEKB) over bar electron-positron collider. Our results, P-tau(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.
URI
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.211801https://repository.hanyang.ac.kr/handle/20.500.11754/113962
ISSN
0031-9007; 1079-7114
DOI
10.1103/PhysRevLett.118.211801
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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