arXiv 1506.056132015-06hep-thhep-ph

在反向反应Randall-Sundrum方案中的LixonKaluza-Klein引力子模

Lightest Kaluza-Klein graviton mode in a backreacted Randall-Sundrum scenario

Ashmita Das, Soumitra SenGupta

备注：: 12 pages, 1 figure
DOI：: 10.1140/epjc/s10052-016-4264-9

摘要：

近年来，在LHC实验中寻找额外维度的研究中，Randall-Sundrum（RS）最轻KK引力子的特征一直是人们关注的焦点之一。最近的数据从双轻子衰变通道在大型强子对撞机已经确定的实验下限的RS最轻的卡鲁扎-克莱因（KK）引力子的质量为不同的选择的基础参数的理论。在这项工作中，我们探讨了体标量场，这是用来稳定的RS模型，在修改最轻的KK引力子与标准模型（SM）位于可见膜上的物质场的耦合的反反应的影响。在这样一个修改后的背景几何中，我们表明，最轻的KK引力子与SM物质场的耦合得到了显着的抑制，由于包括体稳定的标量场的反反应。这意味着，在对撞机实验中，反向反应参数减弱了RS方案的信号，从而解释了在对撞机中KK引力子的不可见性。因此，我们表明，在对撞机实验中的翘曲额外的尺寸搜索的模量稳定起着至关重要的作用。

英文摘要：

In search of extra dimensions in the ongoing LHC experiments, signatures of Randall-Sundrum (RS) lightest KK graviton have been one of the main focus in recent years. The recent data from the dilepton decay channel at the LHC has determined the experimental lower bound on the mass of the RS lightest Kaluza-Klein (KK) graviton for different choices of underlying parameters of the theory. In this work we explore the effects of the backreaction of the bulk scalar field, which is employed to stabilise the RS model, in modifying the couplings of the lightest KK graviton with the standard model (SM) matter fields located on the visible brane. In such a modified background geometry we show that the coupling of the lightest KK graviton with the SM matter fields gets a significant suppression due to the inclusion of the backreaction of the bulk stabilising scalar field. This implies that the backreaction parameter weakens the signals from RS scenario in collider experiments which in turn explains the non-visibility of KK graviton in colliders. Thus we show that the modulus stabilisation plays a crucial role in the search of warped extra dimensions in collider experiments.

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