Search for an Invisibly Decaying Z ' Boson at Belle II in e( )e(-) -> mu( )mu(-) (e( /-)mu(-/ )) Plus Missing Energy Final States

I Adachi; P Ahlburg; H Aihara; N Akopov; A Aloisio; N Anh Ky; DM Asper; H Atmacan; T Aushev; V Aushev; T Aziz; V Babu; S Baehr; P Bambade; Sw Banerjee; V Bansal; M Barrett; J Baudot; J Becker; PK Behera; J Bennett; E Bernieri; FU Bernlochner; M Bertemes; M Bessner; S Bettarini; F Bianchi; D Biswas; A Bozek; M Bracko; P Branchini; RA Briere; TE Browder; A Budano; L Burmistrov; S Bussino; M Campajola; L Cao; G Casarosa; C Cecchi; D Cervenkov; M-C Chang; R Cheaib; V Chekelian; YQ Chen; Y-T Chen; BG Cheon; K Chilikin; K Cho; S Cho; S-K Choi; S Choudhury; D Cinabro; L Corona; LM Cremaldi; S Cunliffe; T Czank; F Dattola; E De La Cruz-Burelo; G De Nardo; M De Nuccio; G De Pietro; R de Sangro; M Destefanis; S Dey; A De Yta-Hernandez; F Di Capua; Z Dolezal; I Dominguez Jimenez; T Dong; K Dort; D Dossett; S Dubey; S Duell; G Dujany; S Eidelman; M Eliachevitch; JE Fast; T Ferber; D Ferlewicz; G Finocchiaro; S Fiore; A Fodor; F Forti; BG Fulsom; E Ganiev; M Garcia-Hernandez; R Garg; V Gaur; A Gaz; A Gellrich; J Gemmler; T Gessler; R Giordano; A Giri; B Gobbo; R Godang; P Goldenzweig; B Golob; P Gomis; W Gradl; E Graziani; D Greenwald; Y Guan; C Hadjivasiliou; S Halder; T Hara; O Hartbrich; K Hayasaka; H Hayashii; C Hearty; MT Hedges; I Heredia de la Cruz; M Hernandez Villanueva; A Hershenhorn; T Higuchi; EC Hill; M Hoek; C-L Hsu; Y Hu; T Iijima; K Inami; G Inguglia; J Irakkathil Jabbar; A Ishikawa; R Itoh; Y Iwasaki; WW Jacobs; DE Jaffe; E-J Jang; HB Jeon; S Jia; Y Jin; C Joo; KK Joo; J Kahn; H Kakuno; AB Kaliyar; J Kandra; G Karyan; Y Kato; T Kawasaki; BH Kim; C-H Kim; DY Kim; K-H Kim; S-H Kim; YK Kim; Y Kim; TD Kimmel; H Kindo; C Kleinwort; P Kodys; T Koga; S Kohani; I Komarov; S Korpar; N Kovalchuk; TMG Kraetzschmar; P Krizan; R Kroeger; P Krokovny; T Kuhr; J Kumar; M Kumar; R Kumar; K Kumara; S Kurz; A Kuzmin; Y-J Kwon; S Lacaprara; C La Licata; L Lanceri; JS Lange; K Lautenbach; I-S Lee; SC Lee; P Leitl; D Levit; LK Li; YB Li; J Libby; K Lieret; L Li Gioi; Z Liptak; QY Liu; D Liventsev; S Longo; T Luo; Y Maeda; M Maggiora; E Manoni; S Marcello; C Marinas; A Martini; M Masuda; T Matsuda; K Matsuoka; D Matvienko; F Meggendorfer; JC Mei; F Meier; M Merola; F Metzner; M Milesi; C Miller; K Miyabayashi; H Miyake; R Mizuk; K Azmi; GB Mohanty; T Moon; T Morii; H-G Moser; F Mueller; FJ Mueller; Th Muller; G Muroyama; R Mussa; E Nakano; M Nakao; M Nayak; G Nazaryan; D Neverov; C Niebuhr; NK Nisar; S Nishida; K Nishimura; M Nishimura; B Oberhof; K Ogawa; Y Onishchuk; H Ono; Y Onuki; P Oskin; H Ozaki; P Pakhlov; G Pakhlova; A Paladino; A Panta; E Paoloni; H Park; B Paschen; A Passeri; A Pathak; S Paul; TK Pedlar; I Peruzzi; R Peschke; R Pestotnik; M Piccolo; LE Piilonen; V Popov; C Praz; E Prencipe; MT Prim; M Purohit; P Rados; R Rasheed; S Reiter; M Remnev; PK Resmi; I Ripp-Baudot; M Ritter; G Rizzo; LB Rizzuto; SH Robertson; D Rodriguez Perez; JM Roney; C Rosenfeld; A Rostomyan; N Rout; G Russo; D Sahoo; Y Sakai; S Sandilya; A Sangal; L Santelj; P Sartori; Y Sato; V Savinov; B Scavino; J Schueler; C Schwanda; RM Seddon; Y Seino; A Selce; K Senyo; C Sfienti; CP Shen; J-G Shiu; B Shwartz; A Sibidanov; F Simon; RJ Sobie; A Soffer; A Sokolov; E Solovieva; S Spataro; B Spruck; M Staric; S Stefkova; ZS Stottler; R Stroili; J Strube; M Sumihama; T Sumiyoshi; DJ Summers; SY Suzuki; M Tabata; M Takizawa; U Tamponi; S Tanaka; K Tanida; N Taniguchi; P Taras; F Tenchini; E Torassa; K Trabelsi; T Tsuboyama; M Uchida; K Unger; Y Unno; S Uno; Y Ushiroda; SE Vahsen; R van Tonder; GS Varner; KE Varvell; A Vinokurova; L Vitale; A Vossen; M Wakai; HM Wakeling; W Wan Abdullah; CH Wang; M-Z Wang; A Warburton; M Watanabe; J Webb; S Wehle; C Wessel; J Wiechczynski; H Windel; E Won; B Yabsley; S Yamada; W Yan; SB Yang; H Ye; JH Yin; M Yonenaga; CZ Yuan; Y Yusa; L Zani; Z Zhang; V Zhilich; QD Zhou; XY Zhou; V Zhukova

Journal article

Search for an Invisibly Decaying Z ' Boson at Belle II in e( )e(-) -> mu( )mu(-) (e( /-)mu(-/ )) Plus Missing Energy Final States

I Adachi, P Ahlburg, H Aihara, N Akopov, A Aloisio, N Anh Ky, DM Asper, H Atmacan, T Aushev, V Aushev, T Aziz, V Babu, S Baehr, P Bambade, Sw Banerjee, V Bansal, M Barrett, J Baudot, J Becker, PK Behera Show all

PHYSICAL REVIEW LETTERS | AMER PHYSICAL SOC | Published : 2020

DOI: 10.1103/PhysRevLett.124.141801

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Abstract

Theories beyond the standard model often predict the existence of an additional neutral boson, the Z^{'}. Using data collected by the Belle II experiment during 2018 at the SuperKEKB collider, we perform the first searches for the invisible decay of a Z^{'} in the process e^{+}e^{-}→μ^{+}μ^{-}Z^{'} and of a lepton-flavor-violating Z^{'} in e^{+}e^{-}→e^{±}μ^{∓}Z^{'}. We do not find any excess of events and set 90% credibility level upper limits on the cross sections of these processes. We translate the former, in the framework of an L_{μ}-L_{τ} theory, into upper limits on the Z^{'} coupling constant at the level of 5×10^{-2}-1 for M_{Z^{'}}≤6 GeV/c^{2}.

University of Melbourne Researchers

David Dossett Author Physics

Marco Milesi Author Physics

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Funding Acknowledgements

We thank the SuperKEKB group for the excellent operation of the accelerator; the KEK cryogenics group for the efficient operation of the solenoid; and the KEK computer group for on-site computing support. This work was supported by the following funding sources: Science Committee of theRepublic ofArmeniaGrantNo. 18T-1C180; Australian Research Council and Research Grants No. DP180102629, No. DP170102389, No. DP170102204, No. DP150103061, No. FT130100303, and No. FT130100018; Austrian Federal Ministry of Education, Science and Research, and Austrian Science Fund No. P 31361-N36; Natural Sciences and Engineering Research Council of Canada, Compute Canada and CANARIE; Chinese Academy of Sciences and Research Grant No. QYZDJ-SSW-SLH011, National Natural Science Foundation of China and Research Grants No. 11521505, No. 11575017, No. 11675166, No. 11761141009, No. 11705209, and No. 11975076, LiaoNing Revitalization Talents Program under Contract No. XLYC1807135, Shanghai Municipal Science and Technology Committee under Contract No. 19ZR1403000, Shanghai Pujiang Program under Grant No. 18PJ1401000, and the CAS Center for Excellence in Particle Physics (CCEPP); the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LTT17020 and Charles University Grants No. SVV 260448 and GAUK 404316; European Research Council, 7th Framework PIEFGA-2013-622527, Horizon 2020 Marie Sklodowska-Curie GrantAgreementNo. 700525 'NIOBE,' Horizon2020Marie Sklodowska-Curie RISE project JENNIFER Grant Agreement No. 644294, Horizon 2020 ERC-Advanced Grant No. 267104, and NewAve No. 638528 (European grants); L'Institut National de Physique Nucl ' eaire et de Physique des Particules (IN2P3) du CNRS (France); BMBF, DFG, HGF, MPG, and AvH Foundation (Germany); Department of Atomic Energy and Department of Science and Technology (India); Israel Science Foundation Grant No. 2476/17 and United StatesIsrael Binational Science Foundation Grant No. 2016113; IstitutoNazionale di FisicaNucleare and the ResearchGrants BELLE2; Japan Society for the Promotion of Science, Grantin-Aid for Scientific Research Grants No. 16H03968, No. 16H03993, No. 16H06492, No. 16K05323, No. 17H01133, No. 17H05405, No. 18K03621, No. 18H03710, No. 18H05226, No. 19H00682, No. 26220706, and No. 26400255, the National Institute of Informatics, and Science Information NETwork 5 (SINET5), and the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan; National Research Foundation (NRF) of Korea Grants No. 2016R1D1A1B01010135, No. 2016R1D1A1B02012900, No. 2018R1A2B3003643, No. 2018R1A4A1025334, No. 2018R1A6A1A06024970, No. 2018R1D1A1B07047294, No. 2019K1A3A7A09033840, and No. 2019R1I1A3A01058933, Radiation Science Research Institute, Foreign Large-size Research Facility Application Supporting project, the Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information and KREONET/GLORIAD; Universiti Malaya RU grant, Akademi Sains Malaysia, and Ministry of Education Malaysia; Frontiers of Science Program Contracts No. FOINS-296, No. CB221329, No. CB-236394, No. CB-254409, and No. CB180023, and the Thematic Networks program (Mexico); 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 No. 14.W03.31.0026; Slovenian Research Agency and research Grants No. J1-9124 and No. P1-0135; Agencia Estatal de Investigacion, Spain Grants No. FPA2014-55613P and No.r FPA2017-84445-P, and CIDEGENT/2018/020 of GeneralitatValenciana; Ministry of Science and Technology and Research Grants No. MOST106-2112-M-002-005MY3 and No. MOST107-2119-M-002-035-MY3, and the Ministry of Education (Taiwan); Thailand Center of Excellence in Physics; TUBITAK ULAKBIM (Turkey); Ministry of Education and Science of Ukraine; the U.S. National Science Foundation and Research Grant No. PHY-1807007 and No. PHY-1913789, and the U.S. Department of Energy and Research Grants No. DE-AC06-76RLO1830, No. DE-SC0007983, No. DE-SC0009824, No. DE-SC0009973, No. DE-SC0010073, No. DE-SC0010118, No. DE-SC0010504, No. DE-SC0011784, No. DE-SC0012704; and the National Foundation for Science and Technology Development (NAFOSTED) of Vietnam under Contract No. 103.99-2018.45.