Probing the Randall-Sundrum geometric origin of flavor with lepton flavor violation
Probing the Randall-Sundrum geometric origin of flavor with lepton flavor violation
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DOI：
10.1103/physrevd.74.053011
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发表时间：
2006-09-01
影响因子：
5
通讯作者：
Petriello, Frank
中科院分区：
文献类型：
--
作者：
Agashe, Kaustubh;Blechman, Andrew E.;Petriello, Frank
味道的无政府Randall-Sundrum模型是一个低能量的解决方案，电弱层次和味道的问题。这样的模型有一个扭曲的、紧凑的额外维度，标准模型中的费米子和规范玻色子生活在主体中，希格斯粒子生活在TeV膜上或附近。在本文中，我们考虑这些模型的轻子味违反约束设置的界限。我们发现，当希格斯场局域在四维膜上时，l -> l（'）gamma形式的环诱导衰变是紫外敏感的，并且是不可计算的;当希格斯场在完整的五维时空中传播时，这种缺陷不会发生。我们发现在整个自然范围内的参数，从μ-e转换的存在下的核，罕见的μ衰变，和罕见的τ衰变的几个TeV水平的限制。环诱导偶极衰变（如mu -> e gamma）和树级过程（如mu-e转换）之间存在张力;它们对五维汤川耦合具有相反的依赖性，使得很难解耦味道破坏效应。我们强调未来实验MEG和PRIME的重要性。这些实验将明确测试兰德尔-桑德拉姆几何起源的层次轻子部门在TeV规模。
The anarchic Randall-Sundrum model of flavor is a low energy solution to both the electroweak hierarchy and flavor problems. Such models have a warped, compact extra dimension with the standard model fermions and gauge bosons living in the bulk, and the Higgs living on or near the TeV brane. In this paper we consider bounds on these models set by lepton flavor-violation constraints. We find that loop-induced decays of the form l -> l(')gamma are ultraviolet sensitive and incalculable when the Higgs field is localized on a four-dimensional brane; this drawback does not occur when the Higgs field propagates in the full five-dimensional space-time. We find constraints at the few TeV level throughout the natural range of parameters, arising from mu-e conversion in the presence of nuclei, rare mu decays, and rare tau decays. A tension exists between loop-induced dipole decays such as mu -> e gamma and tree-level processes such as mu-e conversion; they have opposite dependences on the five-dimensional Yukawa couplings, making it difficult to decouple flavor-violating effects. We emphasize the importance of the future experiments MEG and PRIME. These experiments will definitively test the Randall-Sundrum geometric origin of hierarchies in the lepton sector at the TeV scale.