在未来的轻子对撞机上追踪长寿命双电荷标量
Chasing Long-Lived Doubly Charged Scalars at Future Lepton Colliders
AI总结：
在未来的轻子对撞机上，通过位移顶点和轻子对不变质量分布探测长寿命双电荷标量
摘要：
我们提出了一种新的搜索策略，用于在未来的轻子对撞机上寻找长寿命的双电荷标量。本文研究的双电荷标量属于一个 $SU(2)_L$ 复杂标量三重态，通过II型锯齿机制解释微小的中微子质量。对于标量质量 $\lesssim 200 $ GeV 和适当的三重态真空期望值，该状态可以具有长寿命，并主要衰变成同号μ子对（例如 $μ^+μ^+ $ 或 $μ^-μ^-$），产生独特的位移顶点信号。我们研究了这些标量在国际直线对撞机（ILC）和前景中的μ子对撞机上的对产生，考虑了其计划的总能量。结合理论和实验约束，我们研究了四轻子伴随缺失横向能量的信号。位移顶点提供了标量长寿命的直接证据，同时我们进一步表明，相同电荷轻子对的不变质量分布是发现双电荷Higgs玻色子在ILC和μ子对撞机上的有力补充探测手段。
英文摘要：
We come up with a novel search strategy for long-lived doubly charged scalars at future proposed lepton colliders. The doubly charged scalar studied in this work belongs to an $SU(2)_L$ complex scalar triplet that accounts for tiny neutrino masses via the Type-II Seesaw mechanism. For scalar masses $\lesssim 200 $ GeV and appropriate values of the triplet vacuum expectation value, this state can be long-lived and decay predominantly into like-sign muon pairs (e.g. $μ^+μ^+ $ or $μ^-μ^-$), producing distinctive displaced-vertex signals. We investigate the pair production of these scalars at the International Linear Collider (ILC) and a prospective muon collider, considering their planned center-of-mass energies. Incorporating theoretical and experimental constraints, we study the resulting signature of four leptons accompanied by missing transverse energy. Displaced vertices offer direct evidence of the scalar's long lifetime, while we further show that the invariant mass distribution of same-sign dilepton pairs serves as a powerful complementary probe for discovering doubly charged Higgs bosons at both the ILC and muon collider.
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