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Phys Rev Lett. 2019 Jan 11;122(1):011801. doi: 10.1103/PhysRevLett.122.011801.

Search for a Light CP-odd Higgs Boson and Low-Mass Dark Matter at the Belle Experiment.

Seong IS1, Vahsen SE1, Adachi I2,3, Aihara H4, Al Said S5,6, Asner DM7, Aulchenko V8,9, Aushev T10, Ayad R6, Babu V11, Bakich AM12, Bansal V13, Behera P14, Bhardwaj V15, Bhuyan B16, Bilka T17, Biswal J18, Bobrov A8,9, Bonvicini G19, Bozek A20, Bračko M18,21, Browder TE1, Cao L22, Červenkov D17, Chang P23, Chekelian V24, Chen A25, Cheon BG26, Chilikin K27, Cho K28, Choi Y29, Choudhury S30, Cinabro D19, Cunliffe S31, Dash N32, Di Carlo S33, Dingfelder J34, Dong TV2,3, Eidelman S8,27,9, Epifanov D8,9, Fast JE13, Frey A35, Fulsom BG13, Garg R36, Gaur V37, Gabyshev N8,9, Garmash A8,9, Gelb M22, Giri A30, Goldenzweig P22, Golob B18,38, Guido E39, Haba J2,3, Hayasaka K40, Hayashii H41, Hedges MT1, Higuchi T42, Hou WS23, Hsu CL12, Huang K23, Iijima T43,44, Inami K43, Inguglia G31, Ishikawa A45, Itoh R2,3, Iwasaki M46, Iwasaki Y3, Jacobs WW47, Jeon HB48, Jia S49, Jin Y4, Joffe D50, Joo KK51, Julius T52, Kaliyar AB14, Karyan G31, Kawasaki T53, Kichimi H3, Kiesling C24, Kim DY54, Kim JB55, Kim KT55, Kim SH26, Kinoshita K56, Kodyš P17, Korpar S18,21, Kotchetkov D1, Križan P18,38, Kroeger R57, Krokovny P8,9, Kuhr T58, Kumita T59, Kuzmin A8,9, Kwon YJ60, Lange JS61, Lee IS26, Lee SC48, Li LK62, Li YB63, Li Gioi L24, Libby J14, Liventsev D3,37, Lubej M18, Luo T64, MacQueen C52, Masuda M65, Matsuda T66, Merola M67,68, Miyabayashi K41, Miyata H40, Mizuk R27,69,10, Mohanty GB11, Mori T43, Mussa R39, Nakano E46, Nakao M2,3, Nanut T18, Nath KJ16, Nayak M3,19, Niiyama M70, Nisar NK71, Nishida S2,3, Nishimura K1, Ogawa S72, Ono H73,40, Ostrowicz W20, Pakhlov P27,69, Pakhlova G27,10, Pal B7, Park H48, Pedlar TK74, Pestotnik R18, Piilonen LE37, Prencipe E75, Ritter M58, Rostomyan A31, Russo G67, Sakai Y2,3, Salehi M58,76, Sandilya S56, Santelj L3, Sanuki T45, Savinov V71, Schneider O77, Schnell G78,79, Schueler J1, Schwanda C80, Seino Y40, Senyo K81, Seon O43, Sevior ME52, Shen CP49, Shibata TA82, Shiu JG23, Simon F24,83, Solovieva E27,10, Stanič S84, Starič M18, Sumihama M85, Sumiyoshi T59, Sutcliffe W22, Takizawa M86,87,88, Tanida K89, Tenchini F52, Trabelsi K2,3, Uchida M82, Uglov T27,10, Unno Y26, Uno S2,3, Usov Y8,9, Van Hulse C78, Van Tonder R22, Varner G1, Vinokurova A8,9, Vossen A90, Wang B56, Wang CH91, Wang P62, Watanabe M40, Watanuki S45, Widmann E92, Won E55, Yamamoto H45, Ye H31, Yelton J93, Yuan CZ62, Yusa Y40, Zakharov S27,10, Zhang ZP94, Zhilich V8,9, Zhukova V27,69, Zhulanov V8,9, Zupanc A18,38; Belle Collaboration.

Author information

1
University of Hawaii, Honolulu, Hawaii 96822.
2
SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193.
3
High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
4
Department of Physics, University of Tokyo, Tokyo 113-0033.
5
Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589.
6
Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
7
Brookhaven National Laboratory, Upton, New York 11973.
8
Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
9
Novosibirsk State University, Novosibirsk 630090.
10
Moscow Institute of Physics and Technology, Moscow Region 141700.
11
Tata Institute of Fundamental Research, Mumbai 400005.
12
School of Physics, University of Sydney, New South Wales 2006.
13
Pacific Northwest National Laboratory, Richland, Washington 99352.
14
Indian Institute of Technology Madras, Chennai 600036.
15
Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306.
16
Indian Institute of Technology Guwahati, Assam 781039.
17
Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
18
J. Stefan Institute, 1000 Ljubljana.
19
Wayne State University, Detroit, Michigan 48202.
20
H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342.
21
University of Maribor, 2000 Maribor.
22
Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe.
23
Department of Physics, National Taiwan University, Taipei 10617.
24
Max-Planck-Institut für Physik, 80805 München.
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
Sungkyunkwan University, Suwon 440-746.
30
Indian Institute of Technology Hyderabad, Telangana 502285.
31
Deutsches Elektronen-Synchrotron, 22607 Hamburg.
32
Indian Institute of Technology Bhubaneswar, Satya Nagar 751007.
33
LAL, University Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay.
34
University of Bonn, 53115 Bonn.
35
II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen.
36
Panjab University, Chandigarh 160014.
37
Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061.
38
Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana.
39
INFN-Sezione di Torino, 10125 Torino.
40
Niigata University, Niigata 950-2181.
41
Nara Women's University, Nara 630-8506.
42
Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583.
43
Graduate School of Science, Nagoya University, Nagoya 464-8602.
44
Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602.
45
Department of Physics, Tohoku University, Sendai 980-8578.
46
Osaka City University, Osaka 558-8585.
47
Indiana University, Bloomington, Indiana 47408.
48
Kyungpook National University, Daegu 702-701.
49
Beihang University, Beijing 100191.
50
Kennesaw State University, Kennesaw, Georgia 30144.
51
Chonnam National University, Kwangju 660-701.
52
School of Physics, University of Melbourne, Victoria 3010.
53
Kitasato University, Tokyo 108-0072.
54
Soongsil University, Seoul 156-743.
55
Korea University, Seoul 136-713.
56
University of Cincinnati, Cincinnati, Ohio 45221.
57
University of Mississippi, University, Mississippi 38677.
58
Ludwig Maximilians University, 80539 Munich.
59
Tokyo Metropolitan University, Tokyo 192-0397.
60
Yonsei University, Seoul 120-749.
61
Justus-Liebig-Universität Gießen, 35392 Gießen.
62
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049.
63
Peking University, Beijing 100871.
64
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443.
65
Earthquake Research Institute, University of Tokyo, Tokyo 113-0032.
66
University of Miyazaki, Miyazaki 889-2192.
67
INFN-Sezione di Napoli, 80126 Napoli.
68
Università di Napoli Federico II, 80055 Napoli.
69
Moscow Physical Engineering Institute, Moscow 115409.
70
Kyoto University, Kyoto 606-8502.
71
University of Pittsburgh, Pittsburgh, Pennsylvania 15260.
72
Toho University, Funabashi 274-8510.
73
Nippon Dental University, Niigata 951-8580.
74
Luther College, Decorah, Iowa 52101.
75
Forschungszentrum Jülich, 52425 Jülich.
76
University of Malaya, 50603 Kuala Lumpur.
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
University of Nova Gorica, 5000 Nova Gorica.
85
Gifu University, Gifu 501-1193.
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
Stefan Meyer Institute for Subatomic Physics, Vienna 1090.
93
University of Florida, Gainesville, Florida 32611.
94
University of Science and Technology of China, Hefei 230026.

Abstract

We report on the first Belle search for a light CP-odd Higgs boson, A^{0}, that decays into low mass dark matter, χ, in final states with a single photon and missing energy. We search for events produced via the dipion transition ϒ(2S)→ϒ(1S)π^{+}π^{-}, followed by the on-shell process ϒ(1S)→γA^{0} with A^{0}→χχ, or by the off-shell process ϒ(1S)→γχχ. Utilizing a data sample of 157.3×10^{6} ϒ(2S) decays, we find no evidence for a signal. We set limits on the branching fractions of such processes in the mass ranges M_{A^{0}}<8.97  GeV/c^{2} and M_{χ}<4.44  GeV/c^{2}. We then use the limits on the off-shell process to set competitive limits on WIMP-nucleon scattering in the WIMP mass range below 5  GeV/c^{2}.

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