Z和希格斯玻色子衰变中的双电荷标量一圈效应：当前约束、未来灵敏度及其在轻子三重性模型中的应用
Z and Higgs boson decays with doubly-charged scalars at one-loop: current constraints, future sensitivities, and application to lepton-triality models
AI总结：
本研究分析双电荷标量模型中Z和希格斯玻色子衰变的一圈效应，给出当前及未来对撞机约束，并应用于轻子三重性模型，首次约束其希格斯门户扇区。
摘要：
我们分析了在具有双电荷同位旋单态标量的模型中，由一圈效应诱导的$Z$和希格斯玻色子衰变$Z\to \ell^+ \ell^-$（$\ell = e, \mu, \tau$）、$H\to \gamma\gamma$和$H\to Z\gamma$。在讨论当前约束之后，我们推导了HL-LHC以及可能的未来对撞机ILC、CEPC和FCC将探测的参数空间。然后我们将这些约束应用于轻子三重性模型，该模型基于离散$Z_3$族对称性，最近在Belle II和提议的$\mu^+ \mu^+$和$\mu^+ e^-$对撞机（称为$\mu$TRISTAN）的带电轻子味破坏过程背景下被研究。我们发现，$Z \to \ell^+ \ell^-$对三重性模型的轻子味守恒耦合施加的未来约束，减少了探测轻子味破坏过程的可行参数空间。来自希格斯玻色子衰变的约束是对三重性模型希格斯门户扇区的首个约束。
英文摘要：
We analyse the $Z$ and Higgs boson decays $Z\to \ell^+ \ell^- $ ($\ell = e, μ,τ$), $H\to γγ$ and $H\to Zγ$ that are induced at one-loop level in models with a doubly-charged isosinglet scalar. After discussing current constraints, we derive the parameter space that will be probed by the HL-LHC and the possible future colliders the ILC, CEPC and FCC. We then apply those constraints to lepton triality models which are based on a discrete $Z_3$ family symmetry and were recently studied in the context of charged-lepton flavour-violating processes at Belle II and the proposed $μ^+ μ^+$ and $μ^+ e^-$ collider known as $μ$TRISTAN. We find that the future constraints that can be imposed by $Z \to \ell^+ \ell^-$ on the lepton flavour conserving couplings of the triality models reduce the viable parameter space to probe lepton flavour violating processes. The constraints from Higgs boson decays are the first on the Higgs portal sector of the triality models.
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