Top quark forward-backward asymmetry and charge asymmetry in the left-right twin Higgs model
Top quark forward-backward asymmetry and charge asymmetry in the left-right twin Higgs model
复制标题
左右孪生希格斯模型中的顶夸克前后不对称性和电荷不对称性
DOI：
10.1103/physrevd.85.075017
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发表时间：
2011-11
影响因子：
5
通讯作者：
Jin-Min Yang
中科院分区：
文献类型：
--
作者：
Lei Wang;Lei Wu;Jin-Min Yang
为了解释左右双希格斯模型中顶夸克前后不对称A(FB)(t)的Tevatron异常，我们选择放弃cap场上最轻的中性粒子(h)作为稳定的暗物质候选者。然后允许(h)的新的汤川相互作用，它可以摆脱同号顶对产生的约束，并且对a (FB)(t)有很大的贡献。考虑到顶对产生率（t (t) / bar）、顶衰变率和t (t) / bar不变质量分布的约束，我们发现具有这种新的Yukawa相互作用的模型可以解释在Tevatron上测量到的A(FB)(t)，同时满足在LHC上测量到的电荷不对称性A(C)(t)。此外，该模型预测了大型强子对撞机中的a (C)(t)与Tevatron中的a (FB)(t)之间的强相关性，即a (C)(t)随着a (FB)(t)的增加而增加。
In order to explain the Tevatron anomaly of the top quark forward-backward asymmetry A(FB)(t) in the left-right twin Higgs model, we choose to give up the lightest neutral particle of (h) over cap field as a stable dark matter candidate. Then a new Yukawa interaction for (h) over cap is allowed, which can be free from the constraint of same-sign top pair production and contribute sizably to A(FB)(t). Considering the constraints from the production rates of the top pair (t (t) over bar), the top decay rates, and t (t) over bar invariant mass distribution, we find that this model with such new Yukawa interaction can explain A(FB)(t) measured at the Tevatron while satisfying the charge asymmetry A(C)(t) measured at the LHC. Moreover, this model predicts a strong correlation between A(C)(t) at the LHC and A(FB)(t) at the Tevatron, i.e., A(C)(t) increases as A(FB)(t) increases.