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rare decays of the tau lepton at Belle

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Chinese Physics C 2010年第6期34卷 902-906页

作者： M.Bischofberger Nara Women's University

We report recent results of searches for lepton flavor violation and second class current in decays of τ leptons using the data sample collected in the Belle experiment at the KEKB electron-positron asymmetricenergy ... 详细信息

关键词： tau lepton flavor violation rare decays second class current

rare tau decays from BABAR

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Chinese Physics C 2010年第6期34卷 907-911页

作者： G.D.Lafferty School of Physics and Astronomy The University of Manchester

The BABAR experiment has now completed data taking and with an integrated luminosity of 531 fb^-1 of e^＋e^- collision data has recorded some 480 million tau-pair events. Various studies of suppressed, rare and forbidden decays of the tau have been conducted, including searches for high-multiplicity decays, for second-class hadronic weak currents, and for lepton-flavour violation.

关键词： particle physics tau leptons rare decays

Note on rare Z-boson decays to double heavy quarkonia

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Chinese Physics C 2023年第4期47卷 89-93页

作者：高道能龚玺 Interdisciplinary Center for Theoretical Study University of Science and Technology of ChinaHefei 230026China Peng Huanwu Center for Fundamental Theory Hefei 230026China

Within the standard model,we have investigated rare Z-boson decays into double heavy quarkonia,Z→VV and Z→VP,with V and P denoting vector and pseudo scalar quarkonia,*** is assumed that the leading-order QCD diagrams would give the dominant contributions to these processes,and the corresponding branching fractions,for instance,B(Z→J/ΨJ/Ψ),have been estimated to be approximately 10^(-13)in ***,these decays could also happen through electromagnetic transitions Z→Vγ^(*)and Z→Pγ^(*),with the virtual photon transforming into ***,the smallness of the vector quarkonium mass can give rise to a large factor m_(Z)^(2)/m_(V)^(2)relative to the QCD contributions,which thus counteracts the suppression from the electromagnetic *** systematically include these two types of contributions in our calculation to predict branching fractions for these ***,owing to the virtual photon effects,it is found that B(Z→J/ΨJ/Ψ)will be significantly enhanced,up to 10^(-10).

关键词： rare decays Z-boson heavy quarkonia