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Phys Rev Lett. 2019 Feb 22;122(7):072501. doi: 10.1103/PhysRevLett.122.072501.

Observation of Ξ(1620)^{0} and Evidence for Ξ(1690)^{0} in Ξ_{c}^{+}→Ξ^{-}π^{+}π^{+} Decays.

Sumihama M1,2, Adachi I3,4, Ahn JK5, Aihara H6, Al Said S7,8, Asner DM9, Atmacan H10, Aushev T11, Ayad R8, Babu V12, Badhrees I13,8, Bahinipati S14, Bakich AM15, Bansal V16, Beleño C17, Berger M18, Bhardwaj V19, Bhuyan B20, Bilka T21, Biswal J22, Bonvicini G23, Bozek A24, Bračko M22,25, Browder TE26, Červenkov D21, Chekelian V27, Chen A28, Cheon BG29, Chilikin K30, Cho K31, Choi SK32, Choi Y33, Choudhury S34, Cinabro D23, Cunliffe S35, Czank T36, Dash N14, Di Carlo S37, Doležal Z21, Dong TV3,4, Drásal Z21, Eidelman S38,30,39, Epifanov D38,39, Fast JE16, Fulsom BG16, Garg R40, Gaur V41, Gabyshev N38,39, Garmash A38,39, Gelb M42, Giri A34, Goldenzweig P42, Guido E43, Haba J3,4, Hayasaka K44, Hayashii H45, Hirose S46, Hou WS47, Inami K46, Inguglia G35, Ishikawa A36, Itoh R3,4, Iwasaki M48, Iwasaki Y4, Jacobs WW49, Jeon HB50, Jia S51, Jin Y6, Joo KK52, Julius T53, Kaliyar AB54, Kang KH50, Karyan G35, Kato Y55, Kiesling C27, Kim DY56, Kim JB5, Kim KT5, Kim SH29, Kinoshita K57, Kodyš P21, Korpar S22,25, Kotchetkov D26, Križan P22,58, Kroeger R59, Krokovny P38,39, Kumar R60, Kuzmin A38,39, Kwon YJ61, Lange JS62, Lee IS29, Lee SC50, Li LK63, Li YB64, Li Gioi L27, Libby J54, Liventsev D4,41, Lubej M22, Luo T65, Masuda M66, Matsuda T67, Matvienko D38,30,39, Merola M68,69, Miyabayashi K45, Miyata H44, Mizuk R30,70,11, Mohanty GB12, Moon HK5, Mori T46, Mussa R43, Nakano E48, Nakano T2, Nakao M3,4, Nanut T22, Nath KJ20, Natkaniec Z24, Niiyama M71, Nisar NK72, Nishida S3,4, Ono H73,44, Pakhlov P30,70, Pakhlova G30,11, Pal B9, Pardi S68, Park H50, Paul S74, Pedlar TK75, Pestotnik R22, Piilonen LE41, Popov V30,11, Ritter M76, Russo G68, Sahoo D12, Sandilya S57, Santelj L4, Sanuki T36, Savinov V72, Schneider O77, Schnell G78,79, Schwanda C80, Seino Y44, Senyo K81, Sevior ME53, Shebalin V38,39, Shen CP51, Shibata TA82, Shiu JG47, Shwartz B38,39, Simon F27,83, Sokolov A84, Solovieva E30,11, Starič M22, Strube JF16, Sumiyoshi T85, Takizawa M86,87,88, Tamponi U43, Tanida K89, Taniguchi N4, Tenchini F53, Uchida M82, Uglov T30,11, Uno S3,4, Urquijo P53, Vahsen SE26, Van Hulse C78, Varner G26, Vorobyev V38,30,39, Vossen A90, Wang B57, Wang CH91, Wang MZ47, Wang P63, Wang XL65, Watanabe M44, Watanuki S36, Widmann E18, Won E5, Ye H35, Yelton J92, Yuan CZ63, Yusa Y44, Zakharov S30,11, Zhang ZP93, Zhilich V38,39, Zhukova V30,70, Zhulanov V38,39; Belle Collaboration.

Author information

1
Gifu University, Gifu 501-1193.
2
Research Center for Nuclear Physics, Osaka University, Osaka 567-0047.
3
SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193.
4
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
5
Korea University, Seoul 136-713.
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
Brookhaven National Laboratory, Upton, New York 11973.
10
University of South Carolina, Columbia, South Carolina 29208.
11
Moscow Institute of Physics and Technology, Moscow Region 141700.
12
Tata Institute of Fundamental Research, Mumbai 400005.
13
King Abdulaziz City for Science and Technology, Riyadh 11442.
14
Indian Institute of Technology Bhubaneswar, Satya Nagar 751007.
15
School of Physics, University of Sydney, Sydney, New South Wales 2006.
16
Pacific Northwest National Laboratory, Richland, Washington 99352.
17
II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen.
18
Stefan Meyer Institute for Subatomic Physics, Vienna 1090.
19
Indian Institute of Science Education and Research Mohali, SAS Nagar, Mohali 140306.
20
Indian Institute of Technology Guwahati, Assam 781039.
21
Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
22
J. Stefan Institute, 1000 Ljubljana.
23
Wayne State University, Detroit, Michigan 48202.
24
H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342.
25
University of Maribor, 2000 Maribor.
26
University of Hawaii, Honolulu, Hawaii 96822.
27
Max-Planck-Institut für Physik, 80805 München.
28
National Central University, Chung-li 32054.
29
Hanyang University, Seoul 133-791.
30
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991.
31
Korea Institute of Science and Technology Information, Daejeon 305-806.
32
Gyeongsang National University, Chinju 660-701.
33
Sungkyunkwan University, Suwon 440-746.
34
Indian Institute of Technology Hyderabad, Telangana 502285.
35
Deutsches Elektronen-Synchrotron, 22607 Hamburg.
36
Department of Physics, Tohoku University, Sendai 980-8578.
37
LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay.
38
Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
39
Novosibirsk State University, Novosibirsk 630090.
40
Panjab University, Chandigarh 160014.
41
Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061.
42
Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe.
43
INFN-Sezione di Torino, 10125 Torino.
44
Niigata University, Niigata 950-2181.
45
Nara Women's University, Nara 630-8506.
46
Graduate School of Science, Nagoya University, Nagoya 464-8602.
47
Department of Physics, National Taiwan University, Taipei 10617.
48
Osaka City University, Osaka 558-8585.
49
Indiana University, Bloomington, Indiana 47408.
50
Kyungpook National University, Daegu 702-701.
51
Beihang University, Beijing 100191.
52
Chonnam National University, Kwangju 660-701.
53
School of Physics, University of Melbourne, Victoria 3010.
54
Indian Institute of Technology Madras, Chennai 600036.
55
Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602.
56
Soongsil University, Seoul 156-743.
57
University of Cincinnati, Cincinnati, Ohio 45221.
58
Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana.
59
University of Mississippi, University, Mississippi 38677.
60
Punjab Agricultural University, Ludhiana 141004.
61
Yonsei University, Seoul 120-749.
62
Justus-Liebig-Universität Gießen, 35392 Gießen.
63
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049.
64
Peking University, Beijing 100871.
65
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443.
66
Earthquake Research Institute, University of Tokyo, Tokyo 113-0032.
67
University of Miyazaki, Miyazaki 889-2192.
68
INFN-Sezione di Napoli, 80126 Napoli.
69
Università di Napoli Federico II, 80055 Napoli.
70
Moscow Physical Engineering Institute, Moscow 115409.
71
Kyoto University, Kyoto 606-8502.
72
University of Pittsburgh, Pittsburgh, Pennsylvania 15260.
73
Nippon Dental University, Niigata 951-8580.
74
Department of Physics, Technische Universität München, 85748 Garching.
75
Luther College, Decorah, Iowa 52101.
76
Ludwig Maximilians University, 80539 Munich.
77
École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015.
78
University of the Basque Country UPV/EHU, 48080 Bilbao.
79
IKERBASQUE, Basque Foundation for Science, 48013 Bilbao.
80
Institute of High Energy Physics, Vienna 1050.
81
Yamagata University, Yamagata 990-8560.
82
Tokyo Institute of Technology, Tokyo 152-8550.
83
Excellence Cluster Universe, Technische Universität München, 85748 Garching.
84
Institute for High Energy Physics, Protvino 142281.
85
Tokyo Metropolitan University, Tokyo 192-0397.
86
J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
87
Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198.
88
Showa Pharmaceutical University, Tokyo 194-8543.
89
Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195.
90
Duke University, Durham, North Carolina 27708.
91
National United University, Miao Li 36003.
92
University of Florida, Gainesville, Florida 32611.
93
University of Science and Technology of China, Hefei 230026.

Abstract

We report the first observation of the double strange baryon Ξ(1620)^{0} in its decay to Ξ^{-}π^{+} via Ξ_{c}^{+}→Ξ^{-}π^{+}π^{+} decays based on a 980  fb^{-1} data sample collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. The mass and width are measured to be 1610.4±6.0(stat)_{-4.2}^{+6.1} (syst)  MeV/c^{2} and 59.9±4.8(stat)_{-7.1}^{+2.8}(syst)  MeV, respectively. We obtain 4.0σ evidence of the Ξ(1690)^{0} with the same data sample. These results shed light on the structure of hyperon resonances with strangeness S=-2.

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