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arXiv 0911.2897hep-phhep-ex
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ILC光子-光子碰撞中希格斯玻色子的产生:不同小Higgs模型的比较研究

Higgs boson production in photon-photon collision at ILC: a comparative study in different little Higgs models

Lei Wang, Fuqiang Xu, Jin Min Yang

摘要:

我们在ILC上研究了γγ->h->bb_bar过程,作为对不同小Higgs模型的探索,包括最简单的小Higgs模型(SLH),最小的Higgs模型(LH),以及两种具有T宇称的最小Higgs模型(LHT-Ⅰ,LHT-Ⅱ).与标准模型的预测相比,这些小希格斯模型的产生率发生了很大的变化,更有趣的是,不同的模型给出了不同的预测。我们发现,生产率可能只在LHT-II的参数空间的一部分,而在所有其他情况下,速率被抑制。LH的抑制率可达10%,SLH和LHT-I/LHT-II的抑制率可达60%。当\tan β较大,m_h较小时,SLH中的强抑制发生在新的衰变模式h->ηη(η为轻赝标量)占主导地位的情况下,而当f和m_h都较小时,LHT-I/LHT-II中的强抑制发生在新的衰变模式h->A_H A_H占主导地位的情况下。因此,ILC对这种生产过程的精确测量将允许对这些模型进行测试,甚至区分不同的场景。

英文摘要:

We study the process γγ->h->bb_bar at ILC as a probe of different little Higgs models, including the simplest little Higgs model (SLH), the littlest Higgs model (LH), and two types of littlest Higgs models with T-parity (LHT-I, LHT-II). Compared with the Standard Model (SM) prediction, the production rate is found to be sizably altered in these little Higgs models and, more interestingly, different models give different predictions. We find that the production rate can be possibly enhanced only in the LHT-II for some part of the parameter space, while in all other cases the rate is suppressed. The suppression can be 10% in the LH and as much as 60% in both the SLH and the LHT-I/LHT-II. The severe suppression in the SLH happens for a large \tanβand a small m_h, in which the new decay mode h->ηη(ηis a light pseudo-scalar) is dominant; while for the LHT-I/LHT-II the large suppression occurs when f and m_h are both small so that the new decay mode h->A_H A_H is dominant. Therefore, the precision measurement of such a production process at the ILC will allow for a test of these models and even distinguish between different scenarios.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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