Higgs-mediated Bs,d0→μτ,eτ and τ→3μ,eμμ decays in supersymmetric seesaw models

Higgs-mediated Bs,d0→μτ,eτ and τ→3μ,eμμ decays in supersymmetric seesaw models
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超对称跷跷板模型中希格斯介导的 Bs,d0→μτ,eτ 和 τ→3μ,eμμ 衰减

DOI:
10.1016/s0370-2693(02)02900-3
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发表时间:
2002
期刊:
影响因子:
4.4
通讯作者:
M. Raidal
M. Raidal
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
A. Dedes;J. Ellis;M. Raidal

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我们研究了超对称跷跷板模型中希格斯介导的衰变 Bs,d0→μτ,eτ 和 τ→μμμ,eμμ 所允许的速率,假设轻子味破坏 (LFV) 的唯一来源是由于非对角单线态中微子 Yukawa 相互作用而导致的软超对称破缺项的重正化。这些衰变与 Bs、d0→μμ 和 τ→μ(e)γ 的分支比密切相关并受其限制。根据低能中微子数据对单重态中微子汤川耦合 Yν 和质量 MNi 进行参数化,并允许轻子和夸克以及两个希格斯双峰的味道通用软质量在统一尺度上不同,我们系统地扫描了模型参数空间。中微子数据和当前的实验限制对希格斯介导的 LFV 衰变​​率 Br(Bs0→μτ,eτ)≲4×10−9 和 Br(τ→μμμ,eμμ)≲4×10−10 设置了上限。
We study the rates allowed for the Higgs-mediated decays Bs,d0→μτ,eτ and τ→μμμ,eμμ in supersymmetric seesaw models, assuming that the only source of lepton flavour violation (LFV) is the renormalization of soft supersymmetry-breaking terms due to off-diagonal singlet-neutrino Yukawa interactions. These decays are strongly correlated with, and constrained by, the branching ratios for Bs,d0→μμ and τ→μ(e)γ. Parametrizing the singlet-neutrino Yukawa couplings Yνand masses MNiin terms of low-energy neutrino data, and allowing the flavour-universal soft masses for sleptons and for squarks, as well as those for the two Higgs doublets, to be different at the unification scale, we scan systematically over the model parameter space. Neutrino data and the present experimental constraints set upper limits on the Higgs-mediated LFV decay rates Br(Bs0→μτ,eτ)≲4×10−9and Br(τ→μμμ,eμμ)≲4×10−10.