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Phys Rev Lett. 2019 Mar 1;122(8):082001. doi: 10.1103/PhysRevLett.122.082001.

First Measurements of Absolute Branching Fractions of the Ξ_{c}^{0} Baryon at Belle.

Li YB1, Shen CP2,3, Yuan CZ4, Adachi I5,6, Aihara H7, Al Said S8,9, Asner DM10, Aushev T11, Ayad R9, Badhrees I12,9, Ban Y1, Bansal V13, Beleño C14, Berger M15, Bhardwaj V16, Bhuyan B17, Bilka T18, Biswal J19, Bondar A20,21, Bozek A22, Bračko M19,23, Cao L24, Červenkov D18, Chen A25, Cheon BG26, Chilikin K27, Cho K28, Choi SK29, Choi Y30, Cinabro D31, Cunliffe S32, Di Carlo S33, Doležal Z18, Dong TV5,6, Drásal Z18, Eidelman S20,27,21, Fast JE13, Fulsom BG13, Garg R34, Gaur V35, Gabyshev N20,21, Garmash A20,21, Giri A36, Goldenzweig P24, Greenwald D37, Grube B37, Hayasaka K38, Hayashii H39, Hsu CL40, Iijima T41,42, Inami K41, Inguglia G32, Ishikawa A43, Itoh R5,6, Iwasaki M44, Iwasaki Y6, Jacobs WW45, Jia S2, Jin Y7, Joffe D46, Joo KK47, Karyan G32, Kawasaki T48, Kichimi H6, Kim DY49, Kim HJ50, Kim JB51, Kim KT51, Kim SH26, Kinoshita K52, Kodyš P18, Korpar S19,23, Kotchetkov D53, Križan P19,54, Kroeger R55, Krokovny P20,21, Kumita T56, Kuzmin A20,21, Kwon YJ57, Lee JY58, Lee SC50, Li LK4, Li Gioi L59, Libby J60, Liventsev D6,35, Lubej M19, MacNaughton J61, Masuda M62, Matsuda T61, Merola M63,64, Miyabayashi K39, Miyata H38, Mizuk R27,65,11, Mohanty GB66, Mussa R67, Nakano E44, Nakao M5,6, Nath KJ17, Nayak M6,31, Niiyama M68, Nishida S5,6, Ono H69,38, Onuki Y7, Pakhlov P27,65, Pakhlova G27,11, Pal B10, Pardi S63, Park SH57, Paul S37, Pedlar TK70, Pestotnik R19, Piilonen LE35, Popov V27,11, Prencipe E71, Russo G63, Sakai Y5,6, Salehi M72,73, Sandilya S52, Santelj L6, Sanuki T43, Savinov V74, Schneider O75, Schnell G76,77, Schueler J53, Schwanda C78, Schwartz AJ52, Seino Y38, Senyo K79, Sevior ME80, Shibata TA81, Shiu JG82, Shwartz B20,21, Solovieva E27,11, Starič M19, Sumihama M83, Sumiyoshi T56, Sutcliffe W24, Takizawa M84,85,86, Tanida K87, Tao Y88, Tenchini F32, Trabelsi K5,6, Uchida M81, Uglov T27,11, Unno Y26, Uno S5,6, Urquijo P80, Van Tonder R24, Varner G53, Wang B52, Wang CH89, Wang MZ82, Wang P4, Wang XL3, Won E51, Yang SB51, Ye H32, Yelton J88, Yin JH4, Yusa Y38, Zhang ZP90, Zhilich V20,21, Zhukova V27; Belle Collaboration.

Author information

1
Peking University, Beijing 100871.
2
Beihang University, Beijing 100191.
3
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443.
4
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049.
5
SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193.
6
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
7
Department of Physics, University of Tokyo, Tokyo 113-0033.
8
Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589.
9
Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
10
Brookhaven National Laboratory, Upton, New York 11973.
11
Moscow Institute of Physics and Technology, Moscow Region 141700.
12
King Abdulaziz City for Science and Technology, Riyadh 11442.
13
Pacific Northwest National Laboratory, Richland, Washington 99352.
14
II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen.
15
Stefan Meyer Institute for Subatomic Physics, Vienna 1090.
16
Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306.
17
Indian Institute of Technology Guwahati, Assam 781039.
18
Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
19
J. Stefan Institute, 1000 Ljubljana.
20
Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
21
Novosibirsk State University, Novosibirsk 630090.
22
H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342.
23
University of Maribor, 2000 Maribor.
24
Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe.
25
National Central University, Chung-li 32054.
26
Hanyang University, Seoul 133-791.
27
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991.
28
Korea Institute of Science and Technology Information, Daejeon 305-806.
29
Gyeongsang National University, Chinju 660-701.
30
Sungkyunkwan University, Suwon 440-746.
31
Wayne State University, Detroit, Michigan 48202.
32
Deutsches Elektronen-Synchrotron, 22607 Hamburg.
33
LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay 91405.
34
Panjab University, Chandigarh 160014.
35
Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061.
36
Indian Institute of Technology Hyderabad, Telangana 502285.
37
Department of Physics, Technische Universität München, 85748 Garching.
38
Niigata University, Niigata 950-2181.
39
Nara Women's University, Nara 630-8506.
40
School of Physics, University of Sydney, New South Wales 2006.
41
Graduate School of Science, Nagoya University, Nagoya 464-8602.
42
Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602.
43
Department of Physics, Tohoku University, Sendai 980-8578.
44
Osaka City University, Osaka 558-8585.
45
Indiana University, Bloomington, Indiana 47408.
46
Kennesaw State University, Kennesaw, Georgia 30144.
47
Chonnam National University, Kwangju 660-701.
48
Kitasato University, Sagamihara 252-0373.
49
Soongsil University, Seoul 156-743.
50
Kyungpook National University, Daegu 702-701.
51
Korea University, Seoul 136-713.
52
University of Cincinnati, Cincinnati, Ohio 45221.
53
University of Hawaii, Honolulu, Hawaii 96822.
54
Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana.
55
University of Mississippi, University, Mississippi 38677.
56
Tokyo Metropolitan University, Tokyo 192-0397.
57
Yonsei University, Seoul 120-749.
58
Seoul National University, Seoul 151-742.
59
Max-Planck-Institut für Physik, 80805 München.
60
Indian Institute of Technology Madras, Chennai 600036.
61
University of Miyazaki, Miyazaki 889-2192.
62
Earthquake Research Institute, University of Tokyo, Tokyo 113-0032.
63
INFN-Sezione di Napoli, 80126 Napoli.
64
Università di Napoli Federico II, 80055 Napoli.
65
Moscow Physical Engineering Institute, Moscow 115409.
66
Tata Institute of Fundamental Research, Mumbai 400005.
67
INFN-Sezione di Torino, 10125 Torino.
68
Kyoto University, Kyoto 606-8502.
69
Nippon Dental University, Niigata 951-8580.
70
Luther College, Decorah, Iowa 52101.
71
Forschungszentrum Jülich, 52425 Jülich.
72
Ludwig Maximilians University, 80539 Munich.
73
University of Malaya, 50603 Kuala Lumpur.
74
University of Pittsburgh, Pittsburgh, Pennsylvania 15260.
75
École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015.
76
University of the Basque Country UPV/EHU, 48080 Bilbao.
77
IKERBASQUE, Basque Foundation for Science, 48013 Bilbao.
78
Institute of High Energy Physics, Vienna 1050.
79
Yamagata University, Yamagata 990-8560.
80
School of Physics, University of Melbourne, Victoria 3010.
81
Tokyo Institute of Technology, Tokyo 152-8550.
82
Department of Physics, National Taiwan University, Taipei 10617.
83
Gifu University, Gifu 501-1193.
84
J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
85
Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198.
86
Showa Pharmaceutical University, Tokyo 194-8543.
87
Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195.
88
University of Florida, Gainesville, Florida 32611.
89
National United University, Miao Li 36003.
90
University of Science and Technology of China, Hefei 230026.

Abstract

We present the first measurements of absolute branching fractions of Ξ_{c}^{0} decays into Ξ^{-}π^{+}, ΛK^{-}π^{+}, and pK^{-}K^{-}π^{+} final states. The measurements are made using a dataset comprising (772±11)×10^{6} BB[over ¯] pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider. We first measure the absolute branching fraction for B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0} using a missing-mass technique; the result is B(B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0})=(9.51±2.10±0.88)×10^{-4}. We subsequently measure the product branching fractions B(B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0})B(Ξ_{c}^{0}→Ξ^{-}π^{+}), B(B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0})B(Ξ_{c}^{0}→ΛK^{-}π^{+}), and B(B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0})B(Ξ_{c}^{0}→pK^{-}K^{-}π^{+}) with improved precision. Dividing these product branching fractions by the result for B^{-}→Λ[over ¯]_{c}^{-}Ξ_{c}^{0} yields the following branching fractions: B(Ξ_{c}^{0}→Ξ^{-}π^{+})=(1.80±0.50±0.14)%, B(Ξ_{c}^{0}→ΛK^{-}π^{+})=(1.17±0.37±0.09)%, and B(Ξ_{c}^{0}→pK^{-}K^{-}π^{+})=(0.58±0.23±0.05)%. For the above branching fractions, the first uncertainties are statistical and the second are systematic. Our result for B(Ξ_{c}^{0}→Ξ^{-}π^{+}) can be combined with Ξ_{c}^{0} branching fractions measured relative to Ξ_{c}^{0}→Ξ^{-}π^{+} to yield other absolute Ξ_{c}^{0} branching fractions.

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