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Phys Rev Lett. 2015 Nov 27;115(22):221803. Epub 2015 Nov 24.

Observation of B^{0}→pΛ[over ¯]D^{(*)-}.

Chang YY1, Wang MZ1, Abdesselam A2, Adachi I3,4, Adamczyk K5, Aihara H6, Al Said S7,2, Asner DM8, Atmacan H9, Aushev T10,11, Babu V12, Badhrees I13,2, Bakich AM14, Barberio E15, Bhuyan B16, Biswal J17, Bobrov A18,19, Bozek A5, Bračko M17,20, Browder TE21, Červenkov D22, Chekelian V23, Chen A24, Cheon BG25, Chilikin K10, Chistov R10, Chobanova V23, Choi SK26, Choi Y27, Cinabro D28, Dalseno J23,29, Danilov M10,30, Dingfelder J31, Doležal Z22, Drásal Z22, Dutta D12, Eidelman S18,19, Farhat H28, Fast JE8, Ferber T32, Fulsom BG8, Gaur V12, Gabyshev N18,19, Ganguly S28, Garmash A18,19, Gillard R28, Glattauer R33, Goh YM25, Goldenzweig P34, Greenwald D35, Grzymkowska O5, Haba J3,4, Hayasaka K36, Hayashii H37, He XH38, Hou WS1, Hsu CL15, Iijima T39,36, Inami K39, Ishikawa A40, Itoh R3,4, Iwasaki Y4, Jacobs WW41, Jaegle I21, Joffe D42, Joo KK43, Kawasaki T44, Kim DY45, Kim HJ46, Kim JB47, Kim JH48, Kim KT47, Kim MJ46, Kim SH25, Kim YJ48, Kinoshita K49, Korpar S17,20, Križan P17,50, Krokovny P18,19, Kuhr T51, Kumita T52, Kuzmin A18,19, Kwon YJ53, Lai YT1, Lee IS25, Li L54, Li Y55, Libby J56, Liventsev D4,55, Lukin P18,19, Masuda M57, Matvienko D18,19, Miyabayashi K37, Miyake H3,4, Miyata H44, Mizuk R10,30, Mohanty GB12, Mohanty S12,58, Moll A23,29, Moon HK47, Mori T39, Nakano E59, Nakao M3,4, Nanut T17, Nayak M56, Nishida S3,4, Ogawa S60, Ozaki H3,4, Pakhlov P10,30, Pakhlova G10,11, Pal B49, Park CW27, Pedlar TK61, Pestotnik R17, Petrič M17, Piilonen LE55, Rauch J35, Ribežl E17, Ritter M23, Rostomyan A32, Ryu S62, Sahoo H21, Sakai Y3,4, Sandilya S12, Santelj L4, Sanuki T40, Savinov V63, Schneider O64, Schnell G65,66, Schwanda C33, Seino Y44, Senyo K67, Seong IS21, Sevior ME15, Shebalin V18,19, Shen CP68, Shibata TA69, Shiu JG1, Simon F23,29, Sohn YS53, Starič M17, Stypula J5, Sumihama M70, Sumisawa K3,4, Sumiyoshi T52, Tamponi U71,72, Tanida K62, Teramoto Y59, Uglov T10,11, Unno Y25, Uno S3,4, Usov Y18,19, Van Hulse C65, Vanhoefer P23, Varner G21, Vorobyev V18,19, Vossen A41, Wagner MN73, Wang CH74, Wang P75, Watanabe M44, Watanabe Y76, Williams KM55, Won E47, Yamaoka J8, Yashchenko S32, Yelton J77, Yusa Y44, Zhang ZP54, Zhilich V18,19, Zhulanov V18,19, Zupanc A17; Belle Collaboration.

Author information

1
Department of Physics, National Taiwan University, Taipei 10617.
2
Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
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
Pacific Northwest National Laboratory, Richland, Washington 99352.
9
Middle East Technical University, 06531 Ankara.
10
Institute for Theoretical and Experimental Physics, Moscow 117218.
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
School of Physics, University of Sydney, NSW 2006.
15
School of Physics, University of Melbourne, Victoria 3010.
16
Indian Institute of Technology Guwahati, Assam 781039.
17
J. Stefan Institute, 1000 Ljubljana.
18
Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
19
Novosibirsk State University, Novosibirsk 630090.
20
University of Maribor, 2000 Maribor.
21
University of Hawaii, Honolulu, Hawaii 96822.
22
Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
23
Max-Planck-Institut für Physik, 80805 München.
24
National Central University, Chung-li 32054.
25
Hanyang University, Seoul 133-791.
26
Gyeongsang National University, Chinju 660-701.
27
Sungkyunkwan University, Suwon 440-746.
28
Wayne State University, Detroit, Michigan 48202.
29
Excellence Cluster Universe, Technische Universität München, 85748 Garching.
30
Moscow Physical Engineering Institute, Moscow 115409.
31
University of Bonn, 53115 Bonn.
32
Deutsches Elektronen-Synchrotron, 22607 Hamburg.
33
Institute of High Energy Physics, Vienna 1050.
34
Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe.
35
Department of Physics, Technische Universität München, 85748 Garching.
36
Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602.
37
Nara Women's University, Nara 630-8506.
38
Peking University, Beijing 100871.
39
Graduate School of Science, Nagoya University, Nagoya 464-8602.
40
Tohoku University, Sendai 980-8578.
41
Indiana University, Bloomington, Indiana 47408.
42
Kennesaw State University, Kennesaw, Georgia 30144.
43
Chonnam National University, Kwangju 660-701.
44
Niigata University, Niigata 950-2181.
45
Soongsil University, Seoul 156-743.
46
Kyungpook National University, Daegu 702-701.
47
Korea University, Seoul 136-713.
48
Korea Institute of Science and Technology Information, Daejeon 305-806.
49
University of Cincinnati, Cincinnati, Ohio 45221.
50
Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana.
51
Ludwig Maximilians University, 80539 Munich.
52
Tokyo Metropolitan University, Tokyo 192-0397.
53
Yonsei University, Seoul 120-749.
54
University of Science and Technology of China, Hefei 230026.
55
CNP, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061.
56
Indian Institute of Technology Madras, Chennai 600036.
57
Earthquake Research Institute, University of Tokyo, Tokyo 113-0032.
58
Utkal University, Bhubaneswar 751004.
59
Osaka City University, Osaka 558-8585.
60
Toho University, Funabashi 274-8510.
61
Luther College, Decorah, Iowa 52101.
62
Seoul National University, Seoul 151-742.
63
University of Pittsburgh, Pittsburgh, Pennsylvania 15260.
64
École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015.
65
University of the Basque Country UPV/EHU, 48080 Bilbao.
66
IKERBASQUE, Basque Foundation for Science, 48013 Bilbao.
67
Yamagata University, Yamagata 990-8560.
68
Beihang University, Beijing 100191.
69
Tokyo Institute of Technology, Tokyo 152-8550.
70
Gifu University, Gifu 501-1193.
71
INFN-Sezione di Torino, 10125 Torino.
72
University of Torino, 10124 Torino.
73
Justus-Liebig-Universität Gießen, 35392 Gießen.
74
National United University, Miao Li 36003.
75
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049.
76
Kanagawa University, Yokohama 221-8686.
77
University of Florida, Gainesville, Florida 32611.

Abstract

We report the first observation of the decays B^{0}→pΛ[over ¯]D^{(*)-}. The data sample of 711  fb^{-1} used in this analysis corresponds to 772×10^{6} BB[over ¯] pairs, collected at the ϒ(4S) resonance by the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We observe 19.8σ and 10.8σ excesses of events for the two decay modes and measure the branching fractions of B^{0}→pΛ[over ¯]D^{-} and B^{0}→pΛ[over ¯]D^{*-} to be (25.1±2.6±3.5)×10^{-6} and (33.6±6.3±4.4)×10^{-6}, respectively, where the first uncertainties are statistical and the second are systematic. These results are not compatible with the predictions based on the generalized factorization approach. In addition, a threshold enhancement in the dibaryon (pΛ[over ¯]) system is observed, consistent with that observed in similar B decays.

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