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arXiv 0705.3844hep-ph
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真实扭曲空间模型中的辐射现象学

Radion Phenomenology in Realistic Warped Space Models

Csaba Csáki, Jay Hubisz, Seung J. Lee

摘要:

我们调查的Randall-Sundrum Radion在现实模型中的电弱对称性破缺与散装规范和费米子领域的现象,因为Radion可能会变成这样的模型中最轻的粒子。我们计算了在这种情况下,批量费米子和规范模式的辐射耦合。需要特别注意与无质量规范场(光子、胶子)的耦合,因为众所周知,环效应对这些场可能很重要。我们还提出了一个详细的解释,这些耦合的CFT解释。然后,我们使用这些耦合,以确定放射性的分支分数,并讨论了一些发现潜力的大型强子对撞机的放射性。我们发现,伽马-伽马信号增强的大部分范围内的放射性质量超过伽马-伽马信号的SM希格斯,只要RS规模是足够低的。然而,信号的意义强烈地依赖于自由参数,其特征在于裸膜定域动力学项的无质量规范场的大小。在没有这些项的情况下,信号可以比传统的RS 1模型(其中所有的标准模型场都定位在IR膜上)增强,但是如果膜定位项是相当大的,则与RS 1相比信号也可以减小。我们还表明,对于较大的radion质量,γ-γ信号不再显着,人们可以使用通常的4轻子信号来发现radion。

英文摘要:

We investigate the phenomenology of the Randall-Sundrum radion in realistic models of electroweak symmetry breaking with bulk gauge and fermion fields, since the radion may turn out to be the lightest particle in such models. We calculate the coupling of the radion in such scenarios to bulk fermion and gauge modes. Special attention needs to be devoted to the coupling to massless gauge fields (photon, gluon), since it is well known that loop effects may be important for these fields. We also present a detailed explanation of these couplings from the CFT interpretation. We then use these couplings to determine the radion branching fractions and discuss some of the discovery potential of the LHC for the radion. We find that the gamma-gamma signal is enhanced over most of the range of the radion mass over the gamma-gamma signal of a SM Higgs, as long as the RS scale is sufficiently low. However, the signal significance depends strongly on free parameters that characterize the magnitude of bare brane-localized kinetic terms for the massless gauge fields. In the absence of such terms, the signal can be be enhanced over the traditional RS1 models (where all standard model fields are localized on the IR brane), but the signal can also be reduced compared to RS1 if the brane localized terms are sizeable. We also show that for larger radion masses, where the gamma-gamma signal is no longer significant, one can use the usual 4 lepton signal to discover the radion.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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