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arXiv 0902.2400hep-ph
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5D有味理论中轻子味破坏的松弛约束

Relaxing Constraints from Lepton Flavor Violation in 5D Flavorful Theories

Kaustubh Agashe

摘要:

我们提出了新的机制,改善的卡鲁扎-克莱因(KK)质量标度的约束带电轻子味破坏的标准模型(SM)的框架内传播的一个扭曲的额外的维度,特别是在模型占中微子数据。这些机制利用了扩展的五维(5D)电弱规范对称性[SU(2)_L x SU(2)_R x U(1)_X],为了满足该框架中的电弱精确测试,该规范对称性已经被强烈地激发。在这种对称性下,轻子表示的新选择(自然地)可以允许左手(LH)带电轻子的小混合角,同时允许它们的SU(2)_L伙伴的大混合角,即,LH中微子,中微子数据被占后者的混合。因此,在这些模型中,可以避免由在轻子带电电流中观察到的大混合角引起的带电轻子味违反的增强,该混合角存在于LH带电轻子和中微子混合角相似的表示的最小选择中。这个想法也可能是有用的抑制贡献B_{d, s}混合在这个框架中,为了抑制味道违反超伴侣(而不是从KK模式)在5D“美味超对称”模型。此外,较少的最小表示可以为费米子与Z的耦合转移提供监护保护,进而进一步抑制在扭曲的额外维度场景中来自树级Z交换的带电轻子味道违反。结果表明,即使在弯曲额外维的框架下,~O(3)TeV KK质量标度的5D味参数没有任何特殊结构,也能同时与带电轻子味破坏和中微子数据相一致。

英文摘要:

We propose new mechanisms for ameliorating the constraints on the Kaluza-Klein (KK) mass scale from charged lepton flavor violation in the framework of the Standard Model (SM) fields propagating in a warped extra dimension, especially in models accounting for neutrino data. These mechanisms utilize the extended five-dimensional (5D) electroweak gauge symmetry [SU(2)_L x SU(2)_R x U(1)_X] which is already strongly motivated in order to satisfy electroweak precision tests in this framework. New choices of representations for leptons under this symmetry (naturally) can allow small mixing angles for left-handed (LH) charged leptons and simultaneously large mixing angles for their SU(2)_L partners, i.e., the LH neutrinos, with the neutrino data being accounted for by the latter mixings. Enhancement of charged lepton flavor violation by the large mixing angle observed in leptonic charged currents, which is present for the minimal choice of representations where the LH charged lepton and neutrino mixing angles are similar, can thus be avoided in these models. This idea might also be useful for suppressing the contributions to B_{d, s} mixing in this framework and in order to suppress flavor violation from superpartners (instead of from KK modes) in 5D "flavorful supersymmetry" models. Additionally, the less minimal representations can provide custodial protection for shifts in couplings of fermions to Z and, in turn, further suppress charged lepton flavor-violation from tree-level Z exchange in the warped extra-dimensional scenario. As a result, ~O(3) TeV KK mass scale can be simultaneously consistent with charged lepton flavor violation and neutrino data, even without any particular structure in the 5D flavor parameters in the framework of a warped extra dimension.

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