标题： LHC 中来自扭曲矢量共振态级联衰变的信号 显示英文标题

标题： LHC Signals from Cascade Decays of Warped Vector Resonances

摘要： 最近（arXiv:1608.00526），提出了一种新的具有“体”标准模型（SM）的扭曲高维紧化框架：除了紫外（普朗克尺度）和红外（几TeV）膜外，还有一个中间膜，大约在10 TeV处。 SM物质和希格斯场仅从紫外膜传播到这个中间膜，而规范场和引力场在整个体中传播。 这种配置使得最轻的规范卡鲁扎-克莱因（KK）态在LHC的探测范围内，同时满足味和CP约束。 此外，最轻的KK规范玻色子向顶夸克和希格斯玻色子的通常主要衰变模式被抑制。 这种效应使得以前次级的通道变得显著。 这些包括对SM费米子和希格斯玻色子的味无差异衰变，以及一种新通道——衰变为一个radion和一个SM规范玻色子，随后radion衰变为一对SM规范玻色子。 在这项工作中，我们首先描述上述规范KK粒子级联衰变占主导地位的参数空间，从而可以在LHC上作为发现模式。 然后，我们对该模型的LHC信号进行了详细分析，发现300/fb足以在三喷注、喷注+双光子和喷注+双玻色子通道中发现KK-胶子。 然而，KK光子在光子+双喷注，以及KK-W在轻子W+双喷注中需要3000/fb。 这种衰变链的关键特征是一个“双重”共振，即对应于KK规范玻色子和radion的三粒子和二粒子不变质量峰。 显示英文摘要

摘要： Recently (arXiv:1608.00526), a new framework for warped higher-dimensional compactifications with "bulk" standard model (SM) was proposed: in addition to the UV (Planck scale) and IR (a couple of TeV) branes, there is an intermediate brane, taken to be around 10 TeV. The SM matter and Higgs fields propagate from the UV brane down to this intermediate brane only, while gauge and gravity fields propagate in the entire bulk. Such a configuration renders the lightest gauge Kaluza-Klein (KK) states within LHC reach, simultaneously satisfying flavor and CP constraints. In addition, the usual leading decay modes of the lightest KK gauge bosons into top and Higgs bosons are suppressed. This effect permits erstwhile subdominant channels to become significant. These include flavor-universal decays to SM fermions and Higgs bosons, and a novel channel - decay to a radion and a SM gauge boson, followed by radion decay to a pair of SM gauge bosons. In this work, we first delineate the parameter space where the above mentioned cascade decay of gauge KK particles dominates, and thereby can be the discovery mode at the LHC. We then perform a detailed analysis of the LHC signals from this model, finding that 300/fb suffices for evidence of KK-gluon in tri-jet, jet + di-photon and jet + di-boson channels. However, KK photon in photon + di-jet, and KK-W in leptonic W + di-jet require 3000/fb. The crucial feature of this decay chain is a "double" resonance, i.e. 3-particle and 2-particle invariant mass peaks, corresponding to the KK gauge boson and the radion respectively.