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Phys Rev Lett. 2017 May 26;118(21):211801. doi: 10.1103/PhysRevLett.118.211801. Epub 2017 May 26.

Measurement of the τ Lepton Polarization and R(D^{*}) in the Decay B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ}.

Hirose S1, Iijima T1,2, Adachi I3,4, Adamczyk K5, Aihara H6, Al Said S7,8, Asner DM9, Atmacan H10, Aulchenko V11,12, Aushev T13, Ayad R8, Babu V14, Badhrees I15,8, Bakich AM16, Bansal V9, Barberio E17, Behera P18, Berger M19, Bhuyan B20, Biswal J21, Bondar A11,12, Bonvicini G22, Bozek A5, Bračko M21,23, Browder TE24, Červenkov D25, Chang P26, Chen A27, Cheon BG28, Chilikin K29,30, Chistov R29,30, Cho K31, Choi Y32, Cinabro D22, Danilov M29,30, Dash N33, Di Carlo S22, Dingfelder J34, Doležal Z25, Drásal Z25, Dutta D14, Eidelman S11,12, Epifanov D11,12, Farhat H22, Fast JE9, Ferber T35, Fulsom BG9, Gaur V14, Gabyshev N11,12, Garmash A11,12, Goldenzweig P36, Golob B21,37, Greenwald D38, Grygier J36, Haba J3,4, Hara K4, Hasenbusch J34, Hayasaka K39, Hayashii H40, Higuchi T41, Hou WS26, Hsu CL17, Inami K1, Inguglia G35, Ishikawa A42, Itoh R3,4, Iwasaki Y4, Jacobs WW43, Jaegle I44, Jin Y6, Joffe D45, Joo KK46, Julius T17, Kato Y1, Kawasaki T39, Kichimi H4, Kiesling C47, Kim DY48, Kim JB49, Kim KT49, Kim MJ50, Kim SH28, Kinoshita K51, Kodyš P25, Korpar S21,23, Kotchetkov D24, Križan P21,37, Krokovny P11,12, Kuhr T52, Kulasiri R45, Kumar R53, Kwon YJ54, Lange JS55, Li CH17, Li L56, Li Y57, Li Gioi L47, Libby J18, Liventsev D4,57, Lubej M21, Luo T58, MacNaughton J4, Masuda M59, Matsuda T60, Matvienko D11,12, Miyabayashi K40, Miyake H3,4, Miyata H39, Mizuk R29,30,13, Mohanty GB14, Moon HK49, Mori T1, Mussa R61, Nakao M3,4, Nanut T21, Nath KJ20, Natkaniec Z5, Nayak M4,22, Niiyama M62, Nisar NK58, Nishida S3,4, Ogawa S63, Okuno S64, Ono H65,39, Onuki Y6, Ostrowicz W5, Pakhlov P29,30, Pakhlova G29,13, Pal B51, Park CW32, Park H50, Paul S38, Pesántez L34, Pestotnik R21, Piilonen LE57, Prasanth K18, Ritter M52, Rostomyan A35, Rozanska M5, Sakai Y3,4, Sandilya S51, Santelj L4, Sanuki T42, Sato Y1, Savinov V58, Schlüter T52, Schneider O66, Schnell G67,68, Schwanda C69, Seino Y39, Senyo K70, Seon O1, Sevior ME17, Shebalin V11,12, Shen CP71, Shibata TA72, Shiu JG26, Simon F47,73, Sokolov A74, Solovieva E29,13, Starič M21, Strube JF9, Sumisawa K3,4, Sumiyoshi T75, Takizawa M76,77,78, Tamponi U61,79, Tenchini F17, Trabelsi K3,4, Uchida M72, Uglov T29,13, Unno Y28, Uno S3,4, Urquijo P17, Ushiroda Y3,4, Usov Y11,12, Van Hulse C67, Varner G24, Varvell KE16, Vossen A43, Wang CH80, Wang MZ26, Wang P81, Watanabe M39, Watanabe Y64, Widmann E19, Won E49, Yamashita Y65, Ye H35, Yelton J44, Yuan CZ81, Zhang ZP56, Zhilich V11,12, Zhulanov V11,12, Zupanc A21,37; Belle Collaboration.

Author information

1
Graduate School of Science, Nagoya University, Nagoya 464-8602.
2
Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602.
3
SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193.
4
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
5
H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342.
6
Department of Physics, University of Tokyo, Tokyo 113-0033.
7
Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589.
8
Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
9
Pacific Northwest National Laboratory, Richland, Washington 99352.
10
Middle East Technical University, 06531 Ankara.
11
Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
12
Novosibirsk State University, Novosibirsk 630090.
13
Moscow Institute of Physics and Technology, Moscow Region 141700.
14
Tata Institute of Fundamental Research, Mumbai 400005.
15
King Abdulaziz City for Science and Technology, Riyadh 11442.
16
School of Physics, University of Sydney, New South Wales 2006.
17
School of Physics, University of Melbourne, Victoria 3010.
18
Indian Institute of Technology Madras, Chennai 600036.
19
Stefan Meyer Institute for Subatomic Physics, Vienna 1090.
20
Indian Institute of Technology Guwahati, Assam 781039.
21
J. Stefan Institute, 1000 Ljubljana.
22
Wayne State University, Detroit, Michigan 48202.
23
University of Maribor, 2000 Maribor.
24
University of Hawaii, Honolulu, Hawaii 96822.
25
Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
26
Department of Physics, National Taiwan University, Taipei 10617.
27
National Central University, Chung-li 32054.
28
Hanyang University, Seoul 133-791.
29
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991.
30
Moscow Physical Engineering Institute, Moscow 115409.
31
Korea Institute of Science and Technology Information, Daejeon 305-806.
32
Sungkyunkwan University, Suwon 440-746.
33
Indian Institute of Technology Bhubaneswar, Satya Nagar 751007.
34
University of Bonn, 53115 Bonn.
35
Deutsches Elektronen-Synchrotron, 22607 Hamburg.
36
Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe.
37
Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana.
38
Department of Physics, Technische Universität München, 85748 Garching.
39
Niigata University, Niigata 950-2181.
40
Nara Women's University, Nara 630-8506.
41
Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583.
42
Department of Physics, Tohoku University, Sendai 980-8578.
43
Indiana University, Bloomington, Indiana 47408.
44
University of Florida, Gainesville, Florida 32611.
45
Kennesaw State University, Kennesaw, Georgia 30144.
46
Chonnam National University, Kwangju 660-701.
47
Max-Planck-Institut für Physik, 80805 München.
48
Soongsil University, Seoul 156-743.
49
Korea University, Seoul 136-713.
50
Kyungpook National University, Daegu 702-701.
51
University of Cincinnati, Cincinnati, Ohio 45221.
52
Ludwig Maximilians University, 80539 Munich.
53
Punjab Agricultural University, Ludhiana 141004.
54
Yonsei University, Seoul 120-749.
55
Justus-Liebig-Universität Gießen, 35392 Gießen.
56
University of Science and Technology of China, Hefei 230026.
57
Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061.
58
University of Pittsburgh, Pittsburgh, Pennsylvania 15260.
59
Earthquake Research Institute, University of Tokyo, Tokyo 113-0032.
60
University of Miyazaki, Miyazaki 889-2192.
61
INFN-Sezione di Torino, 10125 Torino.
62
Kyoto University, Kyoto 606-8502.
63
Toho University, Funabashi 274-8510.
64
Kanagawa University, Yokohama 221-8686.
65
Nippon Dental University, Niigata 951-8580.
66
École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015.
67
University of the Basque Country UPV/EHU, 48080 Bilbao.
68
IKERBASQUE, Basque Foundation for Science, 48013 Bilbao.
69
Institute of High Energy Physics, Vienna 1050.
70
Yamagata University, Yamagata 990-8560.
71
Beihang University, Beijing 100191.
72
Tokyo Institute of Technology, Tokyo 152-8550.
73
Excellence Cluster Universe, Technische Universität München, 85748 Garching.
74
Institute for High Energy Physics, Protvino 142281.
75
Tokyo Metropolitan University, Tokyo 192-0397.
76
J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
77
Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198.
78
Showa Pharmaceutical University, Tokyo 194-8543.
79
University of Torino, 10124 Torino.
80
National United University, Miao Li 36003.
81
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049.

Abstract

We report the first measurement of the τ lepton polarization P_{τ}(D^{*}) in the decay B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ} as well as a new measurement of the ratio of the branching fractions R(D^{*})=B(B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ})/B(B[over ¯]→D^{*}ℓ^{-}ν[over ¯]_{ℓ}), where ℓ^{-} denotes an electron or a muon, and the τ is reconstructed in the modes τ^{-}→π^{-}ν_{τ} and τ^{-}→ρ^{-}ν_{τ}. We use the full data sample of 772×10^{6}  BB[over ¯] pairs recorded with the Belle detector at the KEKB electron-positron collider. Our results, P_{τ}(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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