Search for Lepton-Flavor-Violating τ Decays to a Lepton and an Invisible Boson at Belle II

被引：12
|
作者：
Adachi, I.
Adamczyk, K.
Aggarwal, L.
Ahmed, H.
Aihara, H.
Akopov, N.
Aloisio, A.
Ky, N. Anh
Asner, D. M.
Aushev, T.
Aushev, V.
Bae, H.
Bahinipati, S.
Bambade, P.
Banerjee, Sw
Baudot, J.
Bauer, M.
Baur, A.
Beaubien, A.
Becker, J.
Behera, P. K.
V. Bennett, J.
Bernieri, E.
Bernlochner, F. U.
Bertacchi, V.
Bertemes, M.
Bertholet, E.
Bessner, M.
Bettarini, S.
Bhuyan, B.
Bianchi, F.
Bilka, T.
Bilokin, S.
Biswas, D.
Bodrov, D.
Bolz, A.
Borah, J.
Bozek, A.
Bracko, M.
Branchini, P.
Browder, T. E.
Budano, A.
Bussino, S.
Campajola, M.
Cao, L.
Casarosa, G.
Cecchi, C.
Chang, M. -C.
Chang, P.
Cheaib, R.
机构：
来源：
PHYSICAL REVIEW LETTERS | 2023年 / 130卷 / 18期
基金：
中国国家自然科学基金; 新加坡国家研究基金会; 澳大利亚研究理事会; 欧盟地平线“2020”; 以色列科学基金会; 欧洲研究理事会; 美国国家科学基金会; 奥地利科学基金会; 日本学术振兴会; 加拿大自然科学与工程研究理事会;
关键词：
LOWEST-ORDER CALCULATIONS; RADIATIVE-CORRECTIONS; MONTE-CARLO; FINAL-STATES; SIMULATION;
D O I：
10.1103/PhysRevLett.130.181803
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We search for lepton-flavor-violating tau- -> e-alpha and tau- -> mu-alpha decays, where alpha is an invisible spin-0 boson. The search uses electron-positron collisions at 10.58 GeV center-of-mass energy with an integrated luminosity of 62.8 fb-1, produced by the SuperKEKB collider and collected with the Belle II detector. We search for an excess in the lepton-energy spectrum of the known tau- -> e- nu over bar e nu tau and tau- -> mu- nu over bar mu nu tau decays. We report 95% confidence-level upper limits on the branching-fraction ratio Bo tau- -> e-alpha thorn =Bo tau- -> e-nu over bar e nu tau thorn in the range o1.1-9.7 thorn x 10-3 and on Bo tau- -> mu- alpha thorn =Bo tau- -> mu- nu over bar mu nu tau thorn in the range o0.7-12.2 thorn x 10-3 for alpha masses between 0 and 1.6 GeV=c2. These results provide the most stringent bounds on invisible boson production from tau decays.
引用
收藏
页数：7
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