Measurement of the τ Lepton Polarization and R (D∗) in the Decay B →d∗τ- ν τ

(Belle Collaboration)

Research output: Contribution to journalArticle

158 Citations (Scopus)

Abstract

We report the first measurement of the τ lepton polarization Pτ(D∗) in the decay B→D∗τ-ντ as well as a new measurement of the ratio of the branching fractions R(D∗)=B(B→D∗τ-ντ)/B(B→D∗-ν), where - denotes an electron or a muon, and the τ is reconstructed in the modes τ-→π-ντ and τ-→ρ-ντ. We use the full data sample of 772×106 BB pairs recorded with the Belle detector at the KEKB electron-positron collider. 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.

Original languageEnglish
Article number211801
JournalPhysical Review Letters
Volume118
Issue number21
DOIs
Publication statusPublished - 2017 May 26

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leptons
decay
polarization
muons
positrons
electrons
detectors
predictions

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Cite this

Measurement of the τ Lepton Polarization and R (D∗) in the Decay B →d∗τ- ν τ. / (Belle Collaboration).

In: Physical Review Letters, Vol. 118, No. 21, 211801, 26.05.2017.

Research output: Contribution to journalArticle

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abstract = "We report the first measurement of the τ lepton polarization Pτ(D∗) in the decay B→D∗τ-ντ as well as a new measurement of the ratio of the branching fractions R(D∗)=B(B→D∗τ-ντ)/B(B→D∗-ν), where - denotes an electron or a muon, and the τ is reconstructed in the modes τ-→π-ντ and τ-→ρ-ντ. We use the full data sample of 772×106 BB pairs recorded with the Belle detector at the KEKB electron-positron collider. 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.",
author = "{(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 V. Aulchenko and T. Aushev and R. Ayad and V. Babu and I. Badhrees and Bakich, {A. M.} and V. Bansal and E. Barberio and P. Behera and M. Berger and B. Bhuyan and J. Biswal and A. Bondar and G. Bonvicini and A. Bozek and M. Bračko and Browder, {T. E.} and D. Červenkov and P. Chang and A. Chen and Cheon, {B. G.} and K. Chilikin and R. Chistov and K. Cho and Y. Choi and D. Cinabro and M. Danilov and N. Dash and {Di Carlo}, S. and J. Dingfelder and Z. DoleŽal and Z. Dr{\'a}sal and D. Dutta and S. Eidelman and D. Epifanov and H. Farhat and Fast, {J. E.} and T. Ferber and Fulsom, {B. G.} and V. Gaur and N. Gabyshev and Eunil Won",
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T1 - Measurement of the τ Lepton Polarization and R (D∗) in the Decay B →d∗τ- ν τ

AU - (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 - Aulchenko, V.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Badhrees, I.

AU - Bakich, A. M.

AU - Bansal, V.

AU - Barberio, E.

AU - Behera, P.

AU - Berger, M.

AU - Bhuyan, B.

AU - Biswal, J.

AU - Bondar, A.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Červenkov, D.

AU - Chang, P.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Chistov, R.

AU - Cho, K.

AU - Choi, Y.

AU - Cinabro, D.

AU - Danilov, M.

AU - Dash, N.

AU - Di Carlo, S.

AU - Dingfelder, J.

AU - DoleŽal, Z.

AU - Drásal, Z.

AU - Dutta, D.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Farhat, H.

AU - Fast, J. E.

AU - Ferber, T.

AU - Fulsom, B. G.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Won, Eunil

PY - 2017/5/26

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N2 - We report the first measurement of the τ lepton polarization Pτ(D∗) in the decay B→D∗τ-ντ as well as a new measurement of the ratio of the branching fractions R(D∗)=B(B→D∗τ-ντ)/B(B→D∗-ν), where - denotes an electron or a muon, and the τ is reconstructed in the modes τ-→π-ντ and τ-→ρ-ντ. We use the full data sample of 772×106 BB pairs recorded with the Belle detector at the KEKB electron-positron collider. 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.

AB - We report the first measurement of the τ lepton polarization Pτ(D∗) in the decay B→D∗τ-ντ as well as a new measurement of the ratio of the branching fractions R(D∗)=B(B→D∗τ-ντ)/B(B→D∗-ν), where - denotes an electron or a muon, and the τ is reconstructed in the modes τ-→π-ντ and τ-→ρ-ντ. We use the full data sample of 772×106 BB pairs recorded with the Belle detector at the KEKB electron-positron collider. 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.

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