论文标题

LHC信号从延长的额外尺寸

LHC Signals for KK Graviton from an Extended Warped Extra Dimension

论文作者

Agashe, Kaustubh, Ekhterachian, Majid, Kim, Doojin, Sathyan, Deepak

论文摘要

我们在“扩展”扭曲的外二维模型的背景下,从Kaluza-Klein(KK)吸引人的生产和衰减中分析了大型强子对撞机(LHC)的信号,其中标准模型(SM)Higgs和Fermion领域被限制在正常的Ultorviolet/Planck Brane和$ simiate($ simiate)之间($ simiate $ simiate($ $ $)($ $ $ $ $ \ fev)。 Brane,而SM仪表字段(和重力)则进一步传播到$ \ sim O(\ hbox {tev})$红外线。这样的框架抑制了KK颗粒效应引起的侵犯风味,同时保持LHC可以使用的KK仪表和引力。我们发现来自KK Graviton的信号与标准翘曲模型中的信号明显不同。这是因为通常,Kk Gractons的通常主要衰减模式进入顶部夸克,Higgs和纵向$ W/Z $颗粒受到这两组颗粒之间的上述空间分离的抑制,因此其他衰减通道可以自身发光。特别是,我们专注于KK Graviton的两个新型衰减通道。第一个是腐烂成一对辐射,每个辐射都会(主要)腐烂成一对SM胶子,从而产生了由两对Dijet共振组成的共振4射流最终状态。另一方面,如果辐射较重和/或kk gluon较轻,则KK Graviton大部分会腐烂成KK Gluon和SM Gluon。由此产生的KK Gluon在Radion和Sm Gluon中具有显着的衰减分支分数,从而产生(再次)4射流签名,但具有不同的基础事件拓扑,即现在具有三种不同的共振。我们证明,高亮度LHC(HL-LHC)在两个通道中对(最高)$ \ sim 4 $ TEV具有敏感性,而在标准的Dijet Resonance搜索通道中,从KK Graviton decay到两个Gluuons中,不太可能具有灵敏度。

We analyze signals at the Large Hadron Collider (LHC) from production and decay of Kaluza-Klein (KK) gravitons in the context of "extended" warped extra-dimensional models, where the standard model (SM) Higgs and fermion fields are restricted to be in-between the usual ultraviolet/Planck brane and a $\sim O(10)$ TeV (new, "intermediate") brane, whereas the SM gauge fields (and gravity) propagate further down to the $\sim O( \hbox{TeV} )$ infrared brane. Such a framework suppresses flavor violation stemming from KK particle effects, while keeping the KK gauge bosons and gravitons accessible to the LHC. We find that the signals from KK graviton are significantly different than in the standard warped model. This is because the usually dominant decay modes of KK gravitons into top quark, Higgs and longitudinal $W/Z$ particles are suppressed by the above spatial separation between these two sets of particles, thus other decay channels are allowed to shine themselves. In particular, we focus on two novel decay channels of the KK graviton. The first one is the decay into a pair of radions, each of which decays (dominantly) into a pair of SM gluons, resulting in a resonant 4-jet final state consisting of two pairs of dijet resonance. On the other hand, if the radion is heavier and/or KK gluon is lighter, then the KK graviton mostly decays into a KK gluon and a SM gluon. The resulting KK gluon has a significant decay branching fraction into radion and SM gluon, thereby generating (again) a 4-jet signature, but with a different underlying event topology, i.e., featuring now three different resonances. We demonstrate that the High-Luminosity LHC (HL-LHC) has sensitivity to KK graviton of (up to) $\sim 4$ TeV in both channels, whereas it is unlikely to have sensitivity in the standard dijet resonance search channel from KK graviton decay into two gluons.

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