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

(Belle Collaboration)

doi:10.1103/PhysRevLett.118.211801

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

(Belle Collaboration)

Chair of Physics I

Nagoya University
KEK and Graduate University for Advanced Studies (Sokendai)
High Energy Accelerator Research Organization (KEK)
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences
University of Tokyo
Faculty of Sciences, King Abdulaziz University
University of Tabuk
Pacific Northwest National Laboratory
Middle East Technical University (METU)
Budker Institute of Nuclear Physics (SB RAS)
Novosibirsk State University
Moscow Institute of Physics and Technology
Tata Institute of Fundamental Research, Mumbai
King Abdulaziz City for Science and Technology
University of Sydney
University of Melbourne
Indian Institute of Technology Madras
Stefan Meyer Institut für Subatomare Physik (SMI)
Indian Institute of Technology Guwahati
Jožef Stefan Institute
Wayne State University
University of Maribor
University of Hawaii
Charles University
National Taiwan University
National Central University
Hanyang University
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
National Research Nuclear University MEPhI
Korea Institute of Science and Technology Information
Sungkyunkwan University
Indian Institute of Technology Bhubaneswar
University of Bonn
Deutsches Elektronen-Synchrotron (DESY)
Humanoid Technologies Lab (H2T)
Univ. of Ljubljana
Technical University of Munich
Niigata University
Nara Women's University
Tohoku University
Indiana University Bloomington
University of Florida
Kennesaw State University
Chonnam National University
Max-Planck-Institut für Physik
Soongsil University
Korea University
Kyungpook National University
Univ. of Cincinnati
University of Munich
Punjab Agricultural University
Yonsei University
Justus-Liebig-Universität Gießen
University of Science and Technology of China
Virginia Polytechnic Institute and State University
University of Pittsburgh
University of Miyazaki
INFN Sez. di Torino
Kyoto University
Toho University
Kanagawa University
Nippon Dental University
EPFL
Biodonostia Health Research Institute-CIBERNED-UPV-EHU
Basque Foundation for Science
Österreichische Akademie der Wissenschaften
Yamagata University
Beihang University
Tokyo Institute of Technology
Cluster of Excellence E-conversion
Institute for High Energy Physics (IHEP)
Tokyo Metropolitan University
Riken
Showa Pharmaceutical University
University of Torino
National United University Taiwan
Institute of High Energy Physics Chinese Academy of Science

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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.

Original language	English
Article number	211801
Journal	Physical Review Letters
Volume	118
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.118.211801
State	Published - 26 May 2017

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10.1103/PhysRevLett.118.211801

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@article{33ef1b9fb0794fd5bd9d09698ea2d84e,

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

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. Bra{\v c}ko and Browder, \{T. E.\} and D. {\v C}ervenkov 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. Dole{\v Z}al 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 S. Paul",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = may,

day = "26",

doi = "10.1103/PhysRevLett.118.211801",

language = "English",

volume = "118",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "21",

}

TY - JOUR

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 - Paul, S.

PY - 2017/5/26

Y1 - 2017/5/26

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.

UR - https://www.scopus.com/pages/publications/85019758244

U2 - 10.1103/PhysRevLett.118.211801

DO - 10.1103/PhysRevLett.118.211801

M3 - Article

C2 - 28598663

AN - SCOPUS:85019758244

SN - 0031-9007

VL - 118

JO - Physical Review Letters

JF - Physical Review Letters

IS - 21

M1 - 211801

ER -

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

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