Search for the dark photon in B 0 → A′A′, A′ → e e −, μ μ −, and π π − decays at Belle

SH Park; YJ Kwon; I Adachi; H Aihara; S Al Said; DM Asner; H Atmacan; T Aushev; R Ayad; V Babu; P Behera; J Bennett; M Bessner; V Bhardwaj; B Bhuyan; T Bilka; J Biswal; G Bonvicini; A Bozek; M Bračko; TE Browder; M Campajola; L Cao; D Červenkov; MC Chang; P Chang; A Chen; BG Cheon; K Chilikin; HE Cho; K Cho; SJ Cho; SK Choi; Y Choi; S Choudhury; D Cinabro; S Cunliffe; S Das; N Dash; G De Nardo; F Di Capua; J Dingfelder; Z Doležal; TV Dong; S Eidelman; D Epifanov; D Ferlewicz; BG Fulsom; R Garg; V Gaur; A Garmash; A Giri; P Goldenzweig; Y Guan; K Gudkova; C Hadjivasiliou; T Hara; O Hartbrich; K Hayasaka; H Hayashii; MT Hedges; M Hernandez Villanueva; WS Hou; CL Hsu; K Huang; T Iijima; K Inami; G Inguglia; A Ishikawa; R Itoh; M Iwasaki; Y Iwasaki; WW Jacobs; I Jaegle; EJ Jang; HB Jeon; S Jia; Y Jin; CW Joo; KK Joo; KH Kang; G Karyan; T Kawasaki; C Kiesling; DY Kim; KH Kim; SH Kim; YK Kim; K Kinoshita; P Kodyš; T Konno; S Korpar; D Kotchetkov; P Križan; R Kroeger; P Krokovny; T Kuhr; M Kumar; K Kumara; K Lalwani

Journal article

Search for the dark photon in B 0 → A′A′, A′ → e e −, μ μ −, and π π − decays at Belle

SH Park, YJ Kwon, I Adachi, H Aihara, S Al Said, DM Asner, H Atmacan, T Aushev, R Ayad, V Babu, P Behera, J Bennett, M Bessner, V Bhardwaj, B Bhuyan, T Bilka, J Biswal, G Bonvicini, A Bozek, M Bračko Show all

Journal of High Energy Physics | Published : 2021

DOI: 10.1007/JHEP04(2021)191

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Abstract

We present a search for the dark photon A′ in the B0 → A′A′ decays, where A′ subsequently decays to e+e−, μ+μ−, and π+π−. The search is performed by analyzing 772 × 106BB¯ events collected by the Belle detector at the KEKB e+e− energy-asymmetric collider at the ϒ(4S) resonance. No signal is found in the dark photon mass range 0.01 GeV/c2 ≤ mA′ ≤ 2.62 GeV/c2, and we set upper limits of the branching fraction of B0 → A′A′ at the 90% confidence level. The products of branching fractions, ℬ(B0→A′A′)×ℬ(A′→e+e−)2 and ℬ(B0→A′A′)×ℬ(A′→μ+μ−)2, have limits of the order of 10−8 depending on the A′ mass. Furthermore, considering A′ decay rate to each pair of charged particles, the upper limits of ℬ (B→ ..

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University of Melbourne Researchers

Martin Sevior Author

Eiasha Waheed Author

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Funding Acknowledgements

We thank B. Batell and M. Pospelov for the discussion of the B0 ! A0 A0 branching fraction which helped to finalize this paper. We thank the KEKB group for the excellent operation of the accelerator; the KEK cryogenics group for the efficient operation of the solenoid; and the KEK computer group, and the Pacific Northwest National Laboratory (PNNL) Environmental Molecular Sciences Laboratory (EMSL) computing group for strong computing support; and the National Institute of Informatics, and Science Information NETwork 5 (SINET5) for valuable network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, the Japan Society for the Promotion of Science (JSPS), and the Tau-Lepton Physics Research Center of Nagoya University; the Australian Research Council including grants DP180102629, DP170102389, DP170102204, DP150103061, FT130100303; Austrian Federal Ministry of Education, Science and Research (FWF) and FWF Austrian Science Fund No. P 31361-N36; the National Natural Science Foundation of China under Contracts No. 11435013, No. 11475187, No. 11521505, No. 11575017, No. 11675166, No. 11705209; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS), Grant No. QYZDJ-SSW-SLH011; the CAS Center for Excellence in Particle Physics (CCEPP); the Shanghai Pujiang Program under Grant No. 18PJ1401000; the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LTT17020; the Carl Zeiss Foundation, the Deutsche Forschungsgemeinschaft, the Excellence Cluster Universe, and the VolkswagenStiftung; the Department of Atomic Energy (Project Identification No. RTI 4002) and the Department of Science and Technology of India; the Istituto Nazionale di Fisica Nucleare of Italy; National Research Foundation (NRF) of Korea Grant Nos. 2016R1D1A1B01010135, 2016R1D1A1B02012900, 2018R1A2B3003643, 2018R1A6A1A06024970, 2018R1D1A1B07047294, 2018R1A4A1025334, 2019K1A3A7A09033840, 2019K1A3A7A09034999, 2019R1I1A3A01058933; Radiation Science Research Institute, Foreign Largesize Research Facility Application Supporting project, the Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information and KREONET/GLORIAD; the Polish Ministry of Science and Higher Education and the National Science Center; the Ministry of Science and Higher Education of the Russian Federation, Agreement 14.W03.31.0026 and the HSE University Basic Research Program, Moscow; University of Tabuk research grants S-1440-0321, S-0256-1438, and S-0280-1439 (Saudi Arabia); the Slovenian Research Agency Grant Nos. J1-9124 and P1-0135; Ikerbasque, Basque Foundation for Science, Spain; the Swiss National Science Foundation; the Ministry of Education and the Ministry of Science and Technology of Taiwan; and the United States Department of Energy and the National Science Foundation.