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arXiv 2101.08255hep-ph
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在LHC上用反向跷跷板机制在左右模型中寻找重中性希格斯玻色子

Search for a heavy neutral Higgs boson in a left-right model with an inverse seesaw mechanism at the LHC

M. Ashry, K. Ezzat, S. Khalil

摘要:

我们发展了一个基于$SU(3)_C\times SU(2)_L\times SU(2)_R\times U(1)_{B-L}\times Z_2$的低尺度左右对称模型,模型中的Higgs扇区仅由一个双重态和一个$SU(2)_R$二重态组成.在这个模型中,轻中微子质量的微小值是通过一个反跷跷板机制产生的。我们强调,在这种设置中,树级的味道改变中性电流可以被强烈抑制,与目前的实验约束一致。我们表明,最轻的$CP$ -甚至希格斯玻色子,这是像标准模型希格斯玻色子,和下一个最轻的希格斯玻色子,$h'$,产生的中性组件的biddlette。我们表明,下一个最轻的希格斯玻色子的质量可以是几百~ \text{GeVs}的数量级。我们分析了在大型强子对撞机(LHC)的质量中心的能量$\sqrt{s}=14~\text{TeV}$和积分光度$L_{\text{int}}=300~{\text{fb}}^{-1}$通过双希格斯通道:$h'\to hh\to b\bar{b}γγ$和$ZZ$通道:$h'\to ZZ\to 4\ell~(\ell=e,~μ)$在积分光度$L_{\text{int}}=3000~{\text{fb}}^{-1}$的$h'$的检测。我们考虑使用$m_{h'}=250~\text{GeV},~400~\text{GeV}$和$600~\text{GeV}$进行分析的三个基准点。我们发现,有希望的信号具有良好的统计意义,可以得到在di-Higgs通道,$2γ+2b$喷流的最终状态。

英文摘要:

We develop a low scale left-right symmetric model based on $SU(3)_C\times SU(2)_L\times SU(2)_R\times U(1)_{B-L}\times Z_2$ with a simplified Higgs sector consisting of only one bidoublet and one $SU(2)_R$ doublet. In this model, the tiny values of light neutrino masses are generated through an inverse-seesaw mechanism. We emphasize that in this setup, the tree-level flavor changing neutral current can be strongly suppressed, consistent with the current experimental constraints. We show that the lightest $CP$-even Higgs boson, which is like the standard model Higgs boson, and the next lightest Higgs boson, $h'$, are generated from the neutral components of the bidoublet. We show that the mass of the next lightest Higgs boson can be of an order a few hundred~\text{GeVs}. We analyze the detection of $h'$ at the Large Hadron Collider (LHC) for a center-of-mass energy $\sqrt{s}=14~\text{TeV}$ and integrated luminosity $L_{\text{int}}=300~{\text{fb}}^{-1}$ via di-Higgs channel: $h'\to hh\to b\bar{b}γγ$ and also in the $ZZ$ channel: $h'\to ZZ\to 4\ell~(\ell=e,~μ)$ at an integrated luminosity $L_{\text{int}}=3000~{\text{fb}}^{-1}$. We consider three benchmark points for this analysis with $m_{h'}=250~\text{GeV},~400~\text{GeV}$, and $600~\text{GeV}$. We show that promising signals with good statistical significances can be obtained in di-Higgs channel, with $2γ+2b$-jets final states.

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