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arXiv 2105.02474hep-phhep-ex
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轻子对撞机II型跷跷板中的同号四轻子签名

Same-Sign Tetralepton Signature in Type-II Seesaw at Lepton Colliders

Xu-Hong Bai, Zhi-Long Han, Yi Jin, Hong-Lei Li, Zhao-Xia Meng

摘要:

通过中性希格斯玻色子的混合及其级联衰变为带电希格斯玻色子的同号四轻子签名是II型跷跷板模型中的独特信号。在本文中,我们研究这种签名在未来的轻子对撞机,如ILC,CLIC,和MuC。在直接搜索的约束下,$H^{\pm\pm}\to W^\pm W^\pm$是$M_{A^0}=400$ GeV在$\sqrt{s}=1$ TeV ILC上唯一可行的衰变模式。在积分光度为$\mathcal{L}=8~ \mathrm{ab}^{-1}$的情况下,具有约150个信号事件的有希望区域对应于$10^{-4}~\text{GeV}\lesssim v_Δ\lesssim10^{-2}$ GeV范围内的窄带。对于较重的三重态标量$M_{A^0}\gtrsim 900$ GeV,虽然$H^{\pm\pm}\to \ell^\pm \ell^\pm$衰变模式是允许的,级联衰变被抑制。在$\sqrt{s}=3$ TeV CLIC处,对于具有$\mathcal{L}=5~ \mathrm{ab}^{-1}$的$M_{A^0}=1000$ GeV,可以在$v_Δ\sim4\times10^{-4}$ GeV和$λ_4\sim0.26$附近获得最大事件数$\sim 16$。同时,我们发现这个签名是没有希望的$M_{A^0}=1500$ GeV在$\sqrt{s}=6$ TeV μ C。

英文摘要:

The same-sign tetralepton signature via mixing of neutral Higgs bosons and their cascade decays to charged Higgs bosons is a unique signal in the type-II seesaw model. In this paper, we study this signature at future lepton colliders, such as ILC, CLIC, and MuC. Constrained by direct search, $H^{\pm\pm}\to W^\pm W^\pm$ is the only viable decay mode for $M_{A^0}=400$ GeV at $\sqrt{s}=1$ TeV ILC. With an integrated luminosity of $\mathcal{L}=8~ \mathrm{ab}^{-1}$, the promising region with about 150 signal events corresponds to a narrow band in the range of $10^{-4}~\text{GeV}\lesssim v_Δ\lesssim10^{-2}$ GeV. For heavier triplet scalars $M_{A^0}\gtrsim 900$ GeV, although the $H^{\pm\pm}\to \ell^\pm \ell^\pm$ decay mode is allowed, the cascade decays are suppressed. A maximum event number $\sim 16$ can be obtained around $v_Δ\sim4\times10^{-4}$ GeV and $λ_4\sim0.26$ for $M_{A^0}=1000$ GeV with $\mathcal{L}=5~ \mathrm{ab}^{-1}$ at $\sqrt{s}=3$ TeV CLIC. Meanwhile, we find that this signature is not promising for $M_{A^0}=1500$ GeV at $\sqrt{s}=6$ TeV MuC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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