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)

doi:10.1103/PhysRevLett.124.141801

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)

The Graduate University for Advanced Studies
High Energy Accelerator Research Organization, Tsukuba
University of Bonn
The University of Tokyo
A. Alikhanian Yerevan Institute of Physics
National Institute for Nuclear Physics
University of Naples Federico II
Duy Tan University
Institute of Physics
Brookhaven National Laboratory
University of Cincinnati
Moscow Institute of Physics and Technology
Kyiv National Taras Shevchenko University
Tata Institute of Fundamental Research
German Electron Synchrotron
Karlsruhe Institute of Technology
Université Paris-Sud
University of Louisville
Pacific Northwest National Laboratory
Université de Strasbourg
Indian Institute of Technology Madras
University of Mississippi
Austrian Academy of Sciences
University of Hawai'i at Mānoa
University of Pisa
University of Turin
H. Niewodniczanski Institute of Nuclear Physics
Jožef Stefan Institute
University of Maribor
Carnegie Mellon University
Roma Tre University
University of Perugia
Charles University
Fu Jen Catholic University
University of British Columbia
Max Planck Institute for Physics (Werner Heisenberg Institute)
University of Science and Technology of China
National Taiwan University
Hanyang University
RAS - P.N. Lebedev Physics Institute
Korea Institute of Science and Technology Information

Research output: Contribution to journal › Article › peer-review

59 Scopus citations

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	https://doi.org/10.1103/PhysRevLett.124.141801
State	Published - 10 Apr 2020

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10.1103/PhysRevLett.124.141801

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@article{f3388ca8c9d44ceca866d0bb1da2cf82,

title = "Search for an Invisibly Decaying Z′ Boson at Belle II in e+e- →μ+μ- (e±μ) Plus Missing Energy Final States",

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{\texttimes}10-2-1 for MZ′≤6 GeV/c2.",

author = "\{(Belle II Collaboration)\} and I. Adachi and P. Ahlburg and H. Aihara and N. Akopov and A. Aloisio and \{Anh Ky\}, N. and Asner, \{D. M.\} and H. Atmacan and T. Aushev and V. Aushev and T. Aziz and V. Babu and S. Baehr and P. Bambade and Sw Banerjee and V. Bansal and M. Barrett and J. Baudot and J. Becker and Behera, \{P. K.\} and Bennett, \{J. V.\} and E. Bernieri and Bernlochner, \{F. U.\} and M. Bertemes and M. Bessner and S. Bettarini and F. Bianchi and D. Biswas and A. Bozek and M. Bra{\v c}ko and P. Branchini and Briere, \{R. A.\} and Browder, \{T. E.\} and A. Budano and L. Burmistrov and S. Bussino and M. Campajola and L. Cao and G. Casarosa and C. Cecchi and D. {\v C}ervenkov and Chang, \{M. C.\} and R. Cheaib and V. Chekelian and Chen, \{Y. Q.\} and Chen, \{Y. T.\} and Cheon, \{B. G.\} and K. Chilikin and K. Cho and H. Park",

note = "Publisher Copyright: {\textcopyright} 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.",

year = "2020",

month = apr,

day = "10",

doi = "10.1103/PhysRevLett.124.141801",

language = "English",

volume = "124",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "14",

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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 - Park, H.

N1 - 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 - https://www.scopus.com/pages/publications/85084169899

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 -

Search for an Invisibly Decaying Z′ Boson at Belle II in e+e- →μ+μ- (e±μ) Plus Missing Energy Final States

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