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arXiv 1001.4526hep-phhep-ex
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类矢量约束的LHC现象学

The LHC Phenomenology of Vectorlike Confinement

Can Kilic, Takemichi Okui

摘要:

我们详细研究了LHC中的“类矢量约束”现象,其中标准模型被一个新的约束规范相互作用和新的轻费米子所增强,在标准模型和新的规范群下携带类矢量电荷。如果新的相互作用局限在TeV尺度,这个框架会产生广泛的外来对撞机签名,例如产生一个矢量共振,衰减为一对对撞机稳定的带电大质量粒子(一个“双CHAMP”共振),一对碰撞稳定的大质量有色粒子(“二-R-强子共振")、通过两个中间标量到多光子、$W$ s和$Z$ s和/或到多喷流终态。为了研究LHC上的这些信号,我们建立了两个基准模型:一个用于双CHAMP和多光子信号,另一个用于双R强子和多喷流信号。对于双CHAMP/多光子模型,标准模型的背景是可以忽略不计的,我们表明,一个完整的重建的频谱是可能的,矢量约束提供了有力的证据。对于双R强子/多喷注模型,我们指出,除了双R强子信号,四个R强子的产生率也可以在大型强子对撞机相当大。这一点,再加上在早期的工作中研究的多射流信号,使得有可能挑选出矢量约束作为基础动力学。

英文摘要:

We investigate in detail the LHC phenomenology of "vectorlike confinement", where the Standard Model is augmented by a new confining gauge interaction and new light fermions that carry vectorlike charges under both the Standard Model and the new gauge group. If the new interaction confines at the TeV scale, this framework gives rise to a wide range of exotic collider signatures such as the production of a vector resonance that decays to a pair of collider-stable charged massive particles (a "di-CHAMP" resonance), to a pair of collider-stable massive colored particles (a "di-R-hadron resonance), to multiple photons, $W$s and $Z$s via two intermediate scalars, and/or to multi-jet final states. To study these signals at the LHC, we set up two benchmark models: one for the di-CHAMP and multi-photon signals, and the other for the di-R-hadron and multijet signals. For the di-CHAMP/multi-photon model, Standard Model backgrounds are negligible, and we show that a full reconstruction of the spectrum is possible, providing powerful evidence for vectorlike confinement. For the di-R-hadron/multijet model, we point out that in addition to the di-R-hadron signal, the rate of the production of four R-hadrons can also be sizable at the LHC. This, together with the multi-jet signals studied in earlier work, makes it possible to single out vectorlike confinement as the underlying dynamics.

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