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arXiv 1609.01874hep-phhep-ex
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在LHC上寻找两个Higgs偶态II跷跷板模型中的轻荷Higgs

Search for a light-charged Higgs in a two-Higgs-doublet type II seesaw model at the LHC

Chuan-Hung Chen, Takaaki Nomura

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16 pages, 5 figures, 4 tables, version accepted for publication in Physics Letters B
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摘要：

在II型双希格斯模型（THDM）中，带电希格斯粒子的能量被$B$辐射衰变限制在几百GeV以上。THDM的Higgs三重态扩展不仅提供了中微子质量的起源和全新的双电荷Higgs衰变模式，而且还通过标量势中新的标量耦合实现了质量为${\cal O}(100)$ GeV的轻电荷Higgs。结果发现，这些轻荷希格斯粒子的衰变取决于它的质量$m_{H^\pm}$、$\tanβ$和混合效应$\sinθ_\pm$：在$\tanβ=1$，如果$m_{H^\pm} > m_W + m_Z$、$\bar b b W^\pm$、$W^\pm Z$和$τν$是主要的衰变模式;然而，如果是$m_{H^\pm} < m_W + m_Z$，那么主要的衰变模式是$\bar b b W$和$τν$，而在$\tanβ=30$，$τν$模式支配着其他衰变。当$m_t > m_{H^\pm} + m_b$，我们发现ATLAS和CMS最近的上界的乘积$BR(t\to H^+ b)BR(H^+\to τ^+ ν)$可以直接应用，并会给出一个严格的约束$m_{H^\pm}$和$\sinθ_\pm$的相关性.如果对于$m_t > (<) m_{H^\pm} + m_b$满足（逃逸）$BR(t\to H^+ b)BR(H^+\to τ^+ ν)$的上限，则发现通过$H^\pm \to W^\pm Z$发现带电希格斯粒子的意义远低于通过$H^\pm \to \bar b b W^\pm$发现带电希格斯粒子的意义。在$\sqrt{s}=13$ TeV处的100 fb $^{-1}$的光度下并且包括实验界限，对于$m_{H^\pm} <(>) m_W + m_Z$，$H^\pm \to \bar b b W^\pm$信号的显著性可以达到$6.2 (2.4)σ$附近。

英文摘要：

A charged Higgs in the type II two-Higgs-doublet model (THDM) has been bounded to be above a few hundred GeV by the radiative $B$ decays. A Higgs triplet extension of the THDM not only provides an origin of neutrino masses and a completely new doubly-charged Higgs decay pattern, but it also achieves a light-charged Higgs with a mass of ${\cal O}(100)$ GeV through the new scalar couplings in the scalar potential. It was found that these light-charged Higgs decays depend on its mass $m_{H^\pm}$, $\tanβ$, and mixing effect $\sinθ_\pm$: at $\tanβ=1$, if $m_{H^\pm} > m_W + m_Z$, $\bar b b W^\pm$, $W^\pm Z$, and $τν$ are the main decay modes; however, if $m_{H^\pm} < m_W + m_Z$, the main decay modes are then $\bar b b W$ and $τν$, and at $\tanβ=30$, the $τν$ mode dominates the other decays. When $m_t > m_{H^\pm} + m_b$, we found that the ATLAS and CMS recent upper bounds on the product of $BR(t\to H^+ b)BR(H^+\to τ^+ ν)$ can be directly applied and will give a strict constraint on the correlation of $m_{H^\pm}$ and $\sinθ_\pm$. If the upper bound of $BR(t\to H^+ b)BR(H^+\to τ^+ ν)$ is satisfied (escaped) for $m_t > (<) m_{H^\pm} + m_b$, it was found that the significance of discovering the charged Higgs through $H^\pm \to W^\pm Z$ is much lower than that through $H^\pm \to \bar b b W^\pm$. With a luminosity of 100 fb$^{-1}$ at $\sqrt{s}=13$ TeV and including the experimental bounds, the significance of the $H^\pm \to \bar b b W^\pm$ signal can reach around $6.2 (2.4)σ$ for $m_{H^\pm} <(>) m_W + m_Z$.

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