Probing new physics through mu - e universality in K ---> l nu
Probing new physics through mu - e universality in K ---> l nu
复制标题
通过 K 中的 mu - e 普遍性探索新物理 ---> l nu
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
R. Petronzio
中科院分区：
文献类型：
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作者：
A. Masiero;P. Paradisi;R. Petronzio
最近的NA48/2对R_K=Gamma(K-> mu nu_e)/Gamma（K->mu nu_mu）的改进强调了K_l2衰变在探索mu-e普适性中的作用。标准模型的超对称（SUSY）扩展可以表现出mu-e非万有贡献。它们的起源是双重的：那些来自轻子风味保存耦合的是相对于那些来自轻子风味破坏（LFV）源的次要的。我们证明了K_l2中的mu-e非普适性在约束具有LFV的SUSY模型的相关区域（例如，具有中微子质量跷跷板机制的超重力）方面是非常有效的。通过与LFV衰减的类似边界的比较，证明了测量R_K与SUSY中探测LFV的相关性。
The recent NA48/2 improvement on R_K=Gamma(K->e nu_e)/Gamma(K->mu nu_mu) emphasizes the role of K_l2 decays in probing the mu-e universality. Supersymmetric (SUSY) extensions of the Standard Model can exhibit mu-e non-universal contributions. Their origin is twofold: those deriving from lepton flavor conserving couplings are subdominant with respect to those arising from lepton flavor violating (LFV) sources. We show that mu-e non-universality in K_l2 is quite effective in constraining relevant regions of SUSY models with LFV (for instance, supergravities with a see-saw mechanism for neutrino masses). A comparison with analogous bounds coming from tau LFV decays proves the relevance of the measurement of R_K to probe LFV in SUSY.