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arXiv 1503.03026hep-ph
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精确测量对Higgs二重态数目的限制

Precision measurements constraints on the number of Higgs doublets

A. E. Cárcamo Hernández, Sergey Kovalenko, Iván Schmidt

摘要:

我们考虑了任意数量$N$的Higgs二重态(NHDM)的标准模型的扩展,并计算了它们对斜参数$S$和$T$的贡献.我们研究了这些参数的精确测量对$N$的可能限制。鉴于NHDM的一般情况下的复杂性,我们分析了几个基准方案的希格斯质谱,确定最轻的CP甚至希格斯粒子最近在LHC观察到的类希格斯粒子的质量为$\sim 125$ GeV。其余的希格斯粒子都在$\sim 600$ GeV的质量标度以上,在这个质量标度以下,除了前面那个著名的信号外,大型强子对撞机实验没有探测到任何类似希格斯粒子的信号。我们表明,在一种情况下,所有重希格斯玻色子以任何尺度简并,希格斯双重态的数量$N$没有限制。然而,上限出现某些不完全简并配置的重希格斯玻色子。

英文摘要:

We consider an extension of the Standard Model with an arbitrary number $N$ of Higgs doublets (NHDM), and calculate their contribution to the oblique parameters $S$ and $T$. We examine the possible limitations on $N$ from precision measurements of these parameters. In view of the complexity of the general case of NHDM, we analyze several benchmark scenarios for the Higgs mass spectrum, identifying the lightest CP-even Higgs with the Higgs-like particle recently observed at the LHC with the mass of $\sim 125$ GeV. The rest of the Higgses are put above the mass scale of $\sim 600$ GeV, below which the LHC experiments do not detect any Higgs-like signals except for the former famous one. We show that, in a scenario, with all the heavy Higgses degenerate at any scale, there are no limitations on the number $N$ of the Higgs doublets. However, upper limits appear for certain not completely degenerate configurations of the heavy Higgses.

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