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±μZ′. 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 Lμ-Lτ theory, into upper limits on the Z′ coupling constant at the level of 5×10-2-1 for MZ′≤6 GeV/c2.
| Original language | English |
|---|---|
| Article number | 141801 |
| Journal | Physical review letters |
| Volume | 124 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - 2020 Apr 10 |
ASJC Scopus subject areas
- Physics and Astronomy(all)
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Search for an Invisibly Decaying Z′ Boson at Belle II in e+e- →μ+μ- (e±μ) Plus Missing Energy Final States. / (Belle II Collaboration).
In: Physical review letters, Vol. 124, No. 14, 141801, 10.04.2020.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Search for an Invisibly Decaying Z′ Boson at Belle II in e+e- →μ+μ- (e±μ) Plus Missing Energy Final States
AU - (Belle II Collaboration)
AU - Adachi, I.
AU - Ahlburg, P.
AU - Aihara, H.
AU - Akopov, N.
AU - Aloisio, A.
AU - Anh Ky, N.
AU - Asner, D. M.
AU - Atmacan, H.
AU - Aushev, T.
AU - Aushev, V.
AU - Aziz, T.
AU - Babu, V.
AU - Baehr, S.
AU - Bambade, P.
AU - Banerjee, Sw
AU - Bansal, V.
AU - Barrett, M.
AU - Baudot, J.
AU - Becker, J.
AU - Behera, P. K.
AU - Bennett, J. V.
AU - Bernieri, E.
AU - Bernlochner, F. U.
AU - Bertemes, M.
AU - Bessner, M.
AU - Bettarini, S.
AU - Bianchi, F.
AU - Biswas, D.
AU - Bozek, A.
AU - Bračko, M.
AU - Branchini, P.
AU - Briere, R. A.
AU - Browder, T. E.
AU - Budano, A.
AU - Burmistrov, L.
AU - Bussino, S.
AU - Campajola, M.
AU - Cao, L.
AU - Casarosa, G.
AU - Cecchi, C.
AU - Červenkov, D.
AU - Chang, M. C.
AU - Cheaib, R.
AU - Chekelian, V.
AU - Chen, Y. Q.
AU - Chen, Y. T.
AU - Cheon, B. G.
AU - Chilikin, K.
AU - Cho, K.
AU - Won, E.
N1 - Funding Information: 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 the Republic of Armenia Grant No. 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 PIEF-GA-2013-622527, Horizon 2020 Marie Sklodowska-Curie Grant Agreement No. 700525 ’NIOBE,’ Horizon 2020 Marie 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 Nucléaire 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 States-Israel Binational Science Foundation Grant No. 2016113; Istituto Nazionale di Fisica Nucleare and the Research Grants BELLE2; Japan Society for the Promotion of Science, Grant-in-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. CB-221329, No. CB-236394, No. CB-254409, and No. CB-180023, 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. FPA2014-55613-P and No. FPA2017-84445-P, and CIDEGENT/2018/020 of Generalitat Valenciana; Ministry of Science and Technology and Research Grants No. MOST106-2112-M-002-005-MY3 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. Funding Information: 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 the Republic of Armenia Grant No.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 PIEF-GA-2013-622527, Horizon 2020 Marie Sklodowska-Curie Grant Agreement No. 700525 NIOBE, Horizon 2020 Marie Sklodowska-Curie RISE project JENNIFER Grant Agreement No. 644294, Horizon 2020 ERC-Advanced Grant No. 267104, and NewAve No. 638528 (European grants); LInstitut National de Physique Nucleaire 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 States-Israel Binational Science Foundation Grant No. 2016113; Istituto Nazionale di Fisica Nucleare and the Research Grants BELLE2; Japan Society for the Promotion of Science, Grant-in-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. CB-221329, No. CB-236394, No. CB-254409, and No. CB-180023, 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. FPA2014-55613-P and No. FPA2017-84445-P, and CIDEGENT/2018/020 of Generalitat Valenciana; Ministry of Science and Technology and Research Grants No. MOST106-2112-M-002-005-MY3 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. Publisher Copyright: © 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/" Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP.
PY - 2020/4/10
Y1 - 2020/4/10
N2 - 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±μZ′. 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 Lμ-Lτ theory, into upper limits on the Z′ coupling constant at the level of 5×10-2-1 for MZ′≤6 GeV/c2.
AB - 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±μZ′. 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 Lμ-Lτ theory, into upper limits on the Z′ coupling constant at the level of 5×10-2-1 for MZ′≤6 GeV/c2.
UR - http://www.scopus.com/inward/record.url?scp=85084169899&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.124.141801
DO - 10.1103/PhysRevLett.124.141801
M3 - Article
C2 - 32338980
AN - SCOPUS:85084169899
SN - 0031-9007
VL - 124
JO - Physical Review Letters
JF - Physical Review Letters
IS - 14
M1 - 141801
ER -