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arXiv 1408.4119hep-ph
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通过$AW^\pm/HW^\pm$通道寻找带电Higgs粒子

Charged Higgs Search via $AW^\pm/HW^\pm$ Channel

Baradhwaj Coleppa, Felix Kling, Shufang Su

摘要:

具有扩展希格斯扇区的电弱对称性破缺模型在理论上有很好的动机。在这项研究中,我们专注于模型的低能谱包含一对带电标量$H^\pm$,以及轻标量H和/或赝标量A。我们研究了与$H^\pm \to AW/HW$相关的$H^\pm tb$的产生,在某些参数区域可以达到相当大的分支分数。详细的对撞机分析,我们得到的排斥界限,以及发现达到在14 TeV的大型强子对撞机的过程$pp \to H^\pm tb \to AW^\pm tb/HW^\pm tb \to ττbbWW, bbbbWW$。我们发现,对于70 GeV的子粒子质量,95%C. L。$σ$ xBR中的排阻范围从大约60 fb变化到25 fb,对于$m_{H^\pm}$,在$ττ$模式中具有300 fb $^{-1}$积分光度的范围从150 GeV到500 GeV。我们进一步解释了这些边界的背景下,第二类两个希格斯双态模型。在$m_{H^\pm}-\tanβ$平面的排斥区可以扩展到$m_{H^\pm}=$ 600 GeV,而发现是可能的$m_{H^\pm}\lesssim$ 400 GeV与300 fb的$^{-1}$综合光度。奇异衰变模式$H^\pm \to AW^\pm/HW^\pm$为带电希格斯粒子的搜索提供了一个与传统模式$H^\pm \to τν$互补的通道。

英文摘要:

Models of electroweak symmetry breaking with extended Higgs sectors are theoretically well motivated. In this study, we focus on models with a low energy spectrum containing a pair of charged scalars $H^\pm$, as well as a light scalar H and/or a pseudoscalar A. We study the $H^\pm tb$ associated production with $H^\pm \to AW/HW$, which could reach sizable branching fractions in certain parameter regions. With detailed collider analysis, we obtain the exclusion bounds as well as discovery reach at the 14 TeV LHC for the process $pp \to H^\pm tb \to AW^\pm tb/HW^\pm tb \to ττbbWW, bbbbWW$. We find that for a daughter particle mass of 70 GeV, the 95% C.L. exclusion reach in $σ$xBR varies from about 60 fb to 25 fb, for $m_{H^\pm}$ ranging from 150 GeV to 500 GeV with 300 fb$^{-1}$ integrated luminosity in the $ττ$ mode. We further interpret these bounds in the context of Type II Two Higgs Doublet Model. The exclusion region in the $m_{H^\pm}-\tanβ$ plane can be extended to $m_{H^\pm}=$ 600 GeV, while discovery is possible for $m_{H^\pm}\lesssim$ 400 GeV with 300 fb$^{-1}$ integrated luminosity. The exotic decay mode $H^\pm \to AW^\pm/HW^\pm$ offers a complementary channel to the conventional mode $H^\pm \to τν$ for charged Higgs searches.

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