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
JournalPhysical Review D
Volume97
Issue number1
DOIs
Publication statusPublished - 2018 Jan 1

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leptons
decay
polarization
muons
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positrons
electrons
detectors
predictions

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

@article{7973df0989454a7d917875f3cc2f6f9b,
title = "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.",
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.",
author = "{(The Belle Collaboration)} and S. Hirose and T. Iijima and I. Adachi and K. Adamczyk and H. Aihara and {Al Said}, S. and Asner, {D. M.} and H. Atmacan and T. Aushev and R. Ayad and T. Aziz and V. Babu and I. Badhrees and Bakich, {A. M.} and V. Bansal and M. Berger and V. Bhardwaj and B. Bhuyan and J. Biswal and A. Bondar and A. Bozek and M. Bračko and Browder, {T. E.} and D. Červenkov and Chang, {M. C.} and P. Chang and V. Chekelian and A. Chen and Cheon, {B. G.} and K. Chilikin and K. Cho and Choi, {S. K.} and Y. Choi and S. Choudhury and D. Cinabro and T. Czank and N. Dash and {Di Carlo}, S. and Z. DoleŽal and D. Dutta and S. Eidelman and Fast, {J. E.} and T. Ferber and Fulsom, {B. G.} and R. Garg and V. Gaur and N. Gabyshev and A. Garmash and M. Gelb and Eunil Won",
year = "2018",
month = "1",
day = "1",
doi = "10.1103/PhysRevD.97.012004",
language = "English",
volume = "97",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "1",

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TY - JOUR

T1 - 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.

AU - (The Belle Collaboration)

AU - Hirose, S.

AU - Iijima, T.

AU - Adachi, I.

AU - Adamczyk, K.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Atmacan, H.

AU - Aushev, T.

AU - Ayad, R.

AU - Aziz, T.

AU - Babu, V.

AU - Badhrees, I.

AU - Bakich, A. M.

AU - Bansal, V.

AU - Berger, M.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Biswal, J.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Červenkov, D.

AU - Chang, M. C.

AU - Chang, P.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, K.

AU - Choi, S. K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Czank, T.

AU - Dash, N.

AU - Di Carlo, S.

AU - DoleŽal, Z.

AU - Dutta, D.

AU - Eidelman, S.

AU - Fast, J. E.

AU - Ferber, T.

AU - Fulsom, B. G.

AU - Garg, R.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gelb, M.

AU - Won, Eunil

PY - 2018/1/1

Y1 - 2018/1/1

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevD.97.012004

DO - 10.1103/PhysRevD.97.012004

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