Search for a Dark Photon and an Invisible Dark Higgs Boson inμ plus μ - and Missing Energy Final States with the Belle II Experiment

被引：5
|
作者：
Abudinen, F.
Adachi, I.
Aggarwal, L.
Aihara, H.
Akopov, N.
Aloisio, A.
Ky, N. Anh
Asner, D. M.
Atmacan, H.
Aushev, T.
Aushev, V.
Babu, V.
Bahinipati, S.
Bambade, P.
Banerjee, Sw.
Bansal, S.
Baudot, J.
Baur, A.
Beaubien, A.
Becker, J.
Behera, P. K.
Bennett, J. V.
Bernieri, E.
Bernlochner, F. U.
Bertemes, M.
Bertholet, E.
Bessner, M.
Bhuyan, B.
Bianchi, F.
Bilka, T.
Biswas, D.
Bobrov, A.
Bolz, D. Bodrov A.
Bozek, A.
Bracko, M.
Branchini, P.
Browder, T. E.
Budano, A.
Bussino, S.
Campajola, M.
Casarosa, G.
Cecchi, C.
Chekelian, V.
Chen, C.
Chen, Y. Q.
Cheon, B. G.
Chilikin, K.
Chirapatpimol, K.
Cho, H. -e.
Cho, K.
机构：
来源：
PHYSICAL REVIEW LETTERS | 2023年 / 130卷 / 07期
基金：
美国国家科学基金会; 奥地利科学基金会; 欧盟地平线“2020”; 欧洲研究理事会; 澳大利亚研究理事会; 加拿大自然科学与工程研究理事会; 新加坡国家研究基金会; 以色列科学基金会; 中国国家自然科学基金; 日本学术振兴会;
关键词：
VECTOR BOSON; GAUGE BOSON; U-GAMMA; E(+)E(-); LIMIT;
D O I：
10.1103/PhysRevLett.130.071804
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The dark photon A' and the dark Higgs boson h' are hypothetical particles predicted in many dark sector models. We search for the simultaneous production of A' and h' in the dark Higgsstrahlung process e+e- -> A'h' with A' -> mu+mu- and h' invisible in electron-positron collisions at a center-of-mass energy of 10.58 GeV in data collected by the Belle II experiment in 2019. With an integrated luminosity of 8.34 fb-1, we observe no evidence for signal. We obtain exclusion limits at 90% Bayesian credibility in the range of 1.7-5.0 fb on the cross section and in the range of 1.7 x 10-8-200 x 10-8 on the effective coupling epsilon 2 x alpha D for the A' mass in the range of 4.0 GeV/c2 < MA' < 9.7 GeV/c2 and for the h' mass Mh' < MA', where epsilon is the mixing strength between the standard model and the dark photon and alpha D is the coupling of the dark photon to the dark Higgs boson. Our limits are the first in this mass range.
引用
收藏
页数：8
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