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125 GeV共振:希格斯还是膨胀/Radion?

Resonance at 125 GeV: Higgs or Dilaton/Radion?

Zackaria Chacko, Roberto Franceschini, Rashmish K. Mishra

摘要:

我们认为,在125 GeV的新粒子,已被观察到的可能性不是标准模型(SM)希格斯,而是与近似共形对称性,已自发破缺的玻色子。我们专注于产生于理论的人工色,或从希格斯玻色子的理论作为一个伪南布-戈德斯通玻色子(pNGB),涉及强共形动力学在紫外线的光子。在pNGB的情况下,我们正在考虑一个框架,其中希格斯粒子明显比玻色子重,因此尚未被观察到。在每一个的technicolor和pNGB的情况下,我们研究的情况下,当SM费米子和规范玻色子是基本的,和的情况下,当他们是强相互作用部门的复合材料。我们的分析采用了共形对称违反的影响,这是必然存在的,因为touchon不是无质量的,是直接适用于广泛的一类模型,稳定的弱规模,并涉及强共形动力学。由于AdS/CFT对应关系的Radion在Randall-Sundrum(RS)模型中的Radion的Radion,我们的研究结果也适用于RS模型与SM字段本地化的红外膜,或在散装。我们确定的参数,可以用来区分与几个不同类别的理论被认为是从对方,并从SM希格斯玻色子。我们对来自几个实验的所有可用数据进行拟合,并突出显示关键观察结果以提取这些参数。我们发现,目前,无论是technicolor和pNGB介子的情况下提供了一个很好的适合的数据,可比的SM希格斯。我们指出了未来的观察,这将有助于证实或证伪每一种情况。

英文摘要:

We consider the possibility that the new particle that has been observed at 125 GeV is not the Standard Model (SM) Higgs, but instead the dilaton associated with an approximate conformal symmetry that has been spontaneously broken. We focus on dilatons that arise from theories of technicolor, or from theories of the Higgs as a pseudo-Nambu-Goldstone boson (pNGB), that involve strong conformal dynamics in the ultraviolet. In the pNGB case, we are considering a framework where the Higgs particle is significantly heavier than the dilaton and has therefore not yet been observed. In each of the technicolor and pNGB scenarios, we study both the case when the SM fermions and gauge bosons are elementary, and the case when they are composites of the strongly interacting sector. Our analysis incorporates conformal symmetry violating effects, which are necessarily present since the dilaton is not massless, and is directly applicable to a broad class of models that stabilize the weak scale and involve strong conformal dynamics. Since the AdS/CFT correspondence relates the radion in Randall-Sundrum (RS) models to the dilaton, our results also apply to RS models with the SM fields localized on the infrared brane, or in the bulk. We identify the parameters that can be used to distinguish the dilatons associated with the several different classes of theories being considered from each other, and from the SM Higgs. We perform a fit to all the available data from several experiments and highlight the key observations to extract these parameters. We find that at present, both the technicolor and pNGB dilaton scenarios provide a good fit to the data, comparable to the SM Higgs. We indicate the future observations that will help to corroborate or falsify each scenario.

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