Title: Possible mixing between elementary and bound state fields in the $t\bar{t}$ production excess at the LHC Show Chinese title

Title: $t\bar{t}$产生过剩中基本场和束缚态场之间的可能混合现象

Abstract: Recent report by CMS Collaboration on the excess of top and anti-top pair production is studied, under the hypothesis of the coexistence of a toponium $(\eta_t)$ and an additional elementary field $(\Psi)$. We examine the scenario where toponium and an additional field are mixed, and consider the plausible scenarios in that case. Two scenarios are examined: one is the minimal model with $\Psi$ close to the inert Higgs doublet, and the other is embedded into the two Higgs doublet models (2HDM), where $\Psi$ is one of the two Higgs scalars after transforming the basis. The value of the each coupling constant is restricted by the Multicritical Point Principle (MPP). Consistency with the data gives constraints on a mixing angle $\theta\ (-45^\circ\le\theta\le45^\circ)$, with which the mass eigenstate $\Psi^\prime$ contributing to the excess is defined by $\Psi^\prime=\Psi\cos \theta + \eta_t\sin \theta$. The obtained results are $|\theta| \le 17^{\circ}$ for the minimum scenario, and $|\theta| \le 1^{\circ}$ for the second scenario of 2HDM(Type II and Y). We also briefly discuss the comparison with Type I and X. Show Chinese abstract

Abstract: 最近CMS合作组对顶夸克和反顶夸克对产生的过剩进行了研究，在拓onium$(\eta_t)$和一个额外的基本场$(\Psi)$共存的假设下。我们考察了拓onium和一个额外场混合的情况，并考虑了这种情况下可能的场景。 examined两种场景：一种是最小模型，其中$\Psi$接近惰性希格斯二重态，另一种是嵌入到两个希格斯二重态模型（2HDM）中，其中$\Psi$是变换基后两个希格斯标量之一。每个耦合常数的值受到多临界点原理（MPP）的限制。与数据的一致性对混合角$\theta\ (-45^\circ\le\theta\le45^\circ)$给出了约束，通过该混合角，贡献于过剩的质量本征态$\Psi^\prime$由$\Psi^\prime=\Psi\cos \theta + \eta_t\sin \theta$定义。 得到的结果是最小情景下的$|\theta| \le 17^{\circ}$，以及 2HDM（类型 II 和 Y）的第二情景下的$|\theta| \le 1^{\circ}$。 我们还简要讨论了与类型 I 和 X 的比较。