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Phys Rev Lett. 2016 May 27;116(21):212001. doi: 10.1103/PhysRevLett.116.212001. Epub 2016 May 24.

Observation of Z_{b}(10610) and Z_{b}(10650) Decaying to B Mesons.

Garmash A1,2, Abdesselam A3, Adachi I4,5, Aihara H6, Asner DM7, Aushev T8, Ayad R3, Aziz T9, Babu V9, Badhrees I10,3, Bakich AM11, Behera P12, Bhardwaj V13, Bhuyan B14, Bobrov A1,2, Bondar A1,2, Bonvicini G15, Bozek A16, Bračko M17,18, Browder TE19, Červenkov D20, Chekelian V21, Chen A22, Cheon BG23, Chilikin K24, Cho K25, Chobanova V21, Choi Y26, Cinabro D15, Dalseno J21,27, Danilov M24, Dash N28, Doležal Z20, Drutskoy A24, Dutta D9, Eidelman S1,2, Epifanov D6, Farhat H15, Fast JE7, Ferber T29, Fulsom BG7, Gaur V9, Gabyshev N1,2, Gillard R15, Goh YM23, Goldenzweig P30, Golob B17,31, Hara T4,5, Hayasaka K32, Hayashii H33, Iijima T34,32, Ishikawa A35, Itoh R4,5, Iwasaki Y5, Jaegle I19, Joffe D36, Joo KK37, Julius T38, Kang KH39, Kato E35, Kawasaki T40, Kim DY41, Kim JB42, Kim KT42, Kim MJ39, Kim SH23, Kim YJ25, Kinoshita K43, Korpar S17,18, Križan P17,31, Krokovny P1,2, Kuhr T44, Kuzmin A1,2, Kwon YJ45, Lange JS46, Lee IS23, Li C38, Li H47, Li L48, Li Gioi L21, Libby J12, Liventsev D5,49, Lukin P1,2, Masuda M50, Matvienko D1,2, Miyabayashi K33, Miyata H40, Mizuk R24,8, Mohanty GB9, Moll A21,27, Mori T34, Mussa R51, Nakano E52, Nakao M4,5, Nanut T17, Natkaniec Z16, Nishida S4,5, Olsen SL53, Pakhlov P24, Pakhlova G8, Pal B43, Park H39, Pedlar TK54, Pestotnik R17, Petrič M17, Piilonen LE49, Pulvermacher C30, Ribežl E17, Ritter M21, Rostomyan A29, Sahoo H19, Sakai Y4,5, Sandilya S9, Sanuki T35, Savinov V55, Schneider O56, Schnell G57,58, Schwanda C59, Seino Y40, Semmler D46, Senyo K60, Seong IS19, Sevior ME38, Shebalin V1,2, Shen CP61, Shibata TA62, Shiu JG63, Shwartz B1,2, Simon F21,27, Sohn YS45, Solovieva E8, Starič M17, Sumiyoshi T64, Tamponi U51,65, Tanida K53, Teramoto Y52, Trabelsi K4,5, Uchida M62, Uehara S4,5, Uglov T8, Uno S4,5, Van Hulse C57, Vanhoefer P21, Varner G19, Vorobyev V1,2, Wagner MN46, Wang CH66, Wang MZ63, Wang P67, Watanabe Y68, Williams KM49, Won E42, Yamamoto H35, Yamaoka J7, Yashchenko S29, Yelton J69, Yook Y45, Yuan CZ67, Zhang ZP48, Zhilich V1,2, Zhulanov V1,2, Zupanc A17; Belle Collaboration.

Author information

1
Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
2
Novosibirsk State University, Novosibirsk 630090.
3
Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
4
SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193.
5
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
6
Department of Physics, University of Tokyo, Tokyo 113-0033.
7
Pacific Northwest National Laboratory, Richland, Washington 99352.
8
Moscow Institute of Physics and Technology, Moscow Region 141700.
9
Tata Institute of Fundamental Research, Mumbai 400005.
10
King Abdulaziz City for Science and Technology, Riyadh 11442.
11
School of Physics, University of Sydney, New South Wales 2006.
12
Indian Institute of Technology Madras, Chennai 600036.
13
University of South Carolina, Columbia, South Carolina 29208.
14
Indian Institute of Technology Guwahati, Assam 781039.
15
Wayne State University, Detroit, Michigan 48202.
16
H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342.
17
J. Stefan Institute, 1000 Ljubljana.
18
University of Maribor, 2000 Maribor.
19
University of Hawaii, Honolulu, Hawaii 96822.
20
Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
21
Max-Planck-Institut für Physik, 80805 München.
22
National Central University, Chung-li 32054.
23
Hanyang University, Seoul 133-791.
24
Moscow Physical Engineering Institute, Moscow 115409.
25
Korea Institute of Science and Technology Information, Daejeon 305-806.
26
Sungkyunkwan University, Suwon 440-746.
27
Excellence Cluster Universe, Technische Universität München, 85748 Garching.
28
Indian Institute of Technology Bhubaneswar, Satya Nagar 751007.
29
Deutsches Elektronen-Synchrotron, 22607 Hamburg.
30
Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe.
31
Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana.
32
Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602.
33
Nara Women's University, Nara 630-8506.
34
Graduate School of Science, Nagoya University, Nagoya 464-8602.
35
Tohoku University, Sendai 980-8578.
36
Kennesaw State University, Kennesaw, Georgia 30144.
37
Chonnam National University, Kwangju 660-701.
38
School of Physics, University of Melbourne, Victoria 3010.
39
Kyungpook National University, Daegu 702-701.
40
Niigata University, Niigata 950-2181.
41
Soongsil University, Seoul 156-743.
42
Korea University, Seoul 136-713.
43
University of Cincinnati, Cincinnati, Ohio 45221.
44
Ludwig Maximilians University, 80539 Munich.
45
Yonsei University, Seoul 120-749.
46
Justus-Liebig-Universität Gießen, 35392 Gießen.
47
Indiana University, Bloomington, Indiana 47408.
48
University of Science and Technology of China, Hefei 230026.
49
CNP, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061.
50
Earthquake Research Institute, University of Tokyo, Tokyo 113-0032.
51
INFN-Sezione di Torino, 10125 Torino.
52
Osaka City University, Osaka 558-8585.
53
Seoul National University, Seoul 151-742.
54
Luther College, Decorah, Iowa 52101.
55
University of Pittsburgh, Pittsburgh, Pennsylvania 15260.
56
École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015.
57
University of the Basque Country UPV/EHU, 48080 Bilbao.
58
IKERBASQUE, Basque Foundation for Science, 48013 Bilbao.
59
Institute of High Energy Physics, Vienna 1050.
60
Yamagata University, Yamagata 990-8560.
61
Beihang University, Beijing 100191.
62
Tokyo Institute of Technology, Tokyo 152-8550.
63
Department of Physics, National Taiwan University, Taipei 10617.
64
Tokyo Metropolitan University, Tokyo 192-0397.
65
University of Torino, 10124 Torino.
66
National United University, Miao Li 36003.
67
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049.
68
Kanagawa University, Yokohama 221-8686.
69
University of Florida, Gainesville, Florida 32611.

Abstract

We report the analysis of the three-body e^{+}e^{-}→BB[over ¯]π^{±}, BB[over ¯]^{*}π^{±}, and B^{*}B[over ¯]^{*}π^{±} processes, including the first observations of the Z_{b}^{±}(10610)→[BB[over ¯]^{*}+c.c.]^{±} and Z_{b}^{±}(10650)→[B^{*}B[over ¯]^{*}]^{±} transitions that are found to dominate the corresponding final states. We measure Born cross sections for the three-body production of σ(e^{+}e^{-}→[BB[over ¯]^{*}+c.c.]^{±}π^{∓})=[17.4±1.6(stat)±1.9(syst)]  pb and σ(e^{+}e^{-}→[B^{*}B[over ¯]^{*}]^{±}π^{∓})=[8.75±1.15(stat)±1.04(syst)]  pb and set a 90% C.L. upper limit of σ(e^{+}e^{-}→[BB[over ¯]]^{±}π^{∓})<2.9  pb. The results are based on a 121.4  fb^{-1} data sample collected with the Belle detector at a center-of-mass energy near the ϒ(10860) peak.

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