arXiv 2011.111312020-11hep-ph

在未来轻子对撞机上通过荷电希格斯对产生荷电希格斯粒子的可观测性

Charged Higgs Observability via Charged Higgs Pair Production at Future Lepton Collider

Nadia Kausar, Ijaz Ahmed, Ather M. W

备注：: 22 pages, 16 figures, 9 tables

摘要：

在未来的轻子对撞机上，采用I型2HDM假设，研究了荷电$ H^{\pm} $的可观测性，质心能量为$ \sqrt{s}=1.5$ TeV。信号处理链是$ e^{+}e^{-} \rightarrow Z^{*}/ γ^{*}\rightarrow H^{+} H^{-}\rightarrow H W^{+} H W^{-}\rightarrow b \overline{b} jjb \overline{b} jj$。该过程通过S通道中的虚γ和Z玻色子交换进行。选取了几个基准点，通过对事件的分析，重建了带电希格斯玻色子$ H^{\pm} $的质量。保持$\tanβ$的值相对较高，以提高$ H\rightarrow b\overline{b} $的分支比，从而有利于信号处理。生成的主要SM后台进程是$ t\overline{t} $。在$100 fb^{-1} $和$ 500 fb^{-1} $的积分亮度下计算信号选择和显著性效率。计算了带电Higgs玻色子$ H^{\pm} $的重建质量和修正质量。通过对实验结果的分析，论证了带电希格斯玻色子可以通过玻色子衰变的对产生过程被发现。这一研究为实验研究者提供了一个很好的方法来检验SM之外的Higgs玻色子，以及在所考虑的参数空间中检验2HDM模型的有效性。

英文摘要：

The observability of charged Higgs $ H^{\pm} $ has been investigated at future lepton collider by assuming type-I 2HDM, at a centre of mass energy $ \sqrt{s}=1.5$ TeV. The signal process chain is $ e^{+}e^{-} \rightarrow Z^{*}/ γ^{*}\rightarrow H^{+} H^{-}\rightarrow H W^{+} H W^{-}\rightarrow b \overline{b} jjb \overline{b} jj$. The process proceed through virtual gamma and Z-boson exchange in S-channel. Several benchmark points are selected and events are analyzed to reconstruct the mass of charged Higgs bosons $ H^{\pm} $. The value of $\tanβ$ is kept relatively high to enhance the branching ratio of $ H\rightarrow b\overline{b} $ to benefit the signal processes. The main SM background processes produced is $ t\overline{t} $. Signal selection and significance efficiencies are calculated at integrated luminosities of $100 fb^{-1} $ and $ 500 fb^{-1} $. The reconstructed and corrected mass of charged Higgs bosons $ H^{\pm} $ is determined. Through analyzing the results, it is demonstrated that charged Higgs bosons can be discovered through pair production process via its bosonic decays. This study is supposed to provide the experimentalists a good way to examine the Higgs bosons beyond SM, as well as to check the validity of 2HDM models in considered parameter space.

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