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arXiv 1305.0002hep-ph
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LHC Higgs介子对II 2 HDM的约束

Constraining Type II 2HDM in Light of LHC Higgs Searches

Baradhwaj Coleppa, Felix Kling, Shufang Su

备注：
34 pages, 18 figures
发表信息：
JHEP 1401, 161 (2014)
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摘要：

我们研究了LHC Higgs搜索结果对II型双Higgs模型的意义。特别是，我们探讨的情况下，观察到的126 GeV希格斯信号被解释为轻CP甚至希格斯$h^0$或重CP甚至希格斯$H^0$。施加理论和实验的限制，我们分析了$m_H$（$m_h$），$m_A$，$m_{H^\pm}$，$\tanβ$和$\sin(β- α)$中的幸存参数区域。我们进一步确定的区域，可以容纳一个126 GeV的希格斯粒子的横截面与观察到的希格斯信号一致。我们发现，在$h^0$-126的情况下，我们被限制到$\tanβ$最多为4的$\sin(β-α) \approx \pm 1$的狭窄区域，或具有$0.55 < \sin(β-α) < 0.9$和$1.5 < \tanβ< 4$的扩展区域。然而，$m_H$、$m_A$和$m_{H^\pm}$的值相对不受约束。在$H^0$-126的情况下，我们限于$\tanβ$高达约8的$\sin(β-α) \sim 0$的狭窄区域，或$-0.8$至$-0.05$之间的$\sin(β-α) $的扩展区域，$\tanβ$扩展至30或更高。由于$Δρ$约束，$m_A$和$m_{H^\pm}$几乎退化。强加风味约束对于$H^0$-126情况显著地收缩了存活参数空间，限制了$\tanβ\lesssim 10$，但在$h^0$-126情况中几乎没有影响。我们还研究了$γγ$、$VV$和$bb/ττ$通道之间的相关性。$γγ$和$VV$通道最有可能与归一化截面的$γγ:VV \sim 1$高度相关。

英文摘要：

We study the implication of the LHC Higgs search results on the Type II Two Higgs-Doublet Model. In particular, we explore the scenarios in which the observed 126 GeV Higgs signal is interpreted as either the light CP-even Higgs $h^0$ or the heavy CP-even Higgs $H^0$. Imposing both theoretical and experimental constraints, we analyze the surviving parameter regions in $m_H$ ($m_h$), $m_A$, $m_{H^\pm}$, $\tanβ$ and $\sin(β- α)$. We further identify the regions that could accommodate a 126 GeV Higgs with cross sections consistent with the observed Higgs signal. We find that in the $h^0$-126 case, we are restricted to narrow regions of $\sin(β-α) \approx \pm 1$ with $\tanβ$ up to 4, or an extended region with $0.55 < \sin(β-α) < 0.9$ and $1.5 < \tanβ< 4$. The values of $m_H$, $m_A$ and $m_{H^\pm}$, however, are relatively unconstrained. In the $H^0$-126 case, we are restricted to a narrow region of $\sin(β-α) \sim 0$ with $\tanβ$ up to about 8, or an extended region of $\sin(β-α) $ between $-0.8$ to $-0.05$, with $\tanβ$ extended to 30 or higher. $m_A$ and $m_{H^\pm}$ are nearly degenerate due to $Δρ$ constraints. Imposing flavor constraints shrinks the surviving parameter space significantly for the $H^0$-126 case, limiting $\tanβ\lesssim 10$, but has little effect in the $h^0$-126 case. We also investigate the correlation between $γγ$, $VV$ and $bb/ττ$ channels. $γγ$ and $VV$ channels are most likely to be highly correlated with $γγ:VV \sim 1$ for the normalized cross sections.

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