同号μ子对撞机上双电荷标量的多玻色子特征
Multiboson Signatures of Doubly Charged Scalars at a Same-Sign Muon Collider
中文总结 AI 辅助
研究同号μ子对撞机对II型跷跷板框架中双电荷标量的敏感性，以μTRISTAN为基准，通过全强子W衰变模式，利用切割分析和多变量策略，对双电荷标量质量有更好探测，优于LHC且提供独立探测。
中文摘要 AI 辅助
我们研究了同号μ⁺μ⁺对撞机对II型跷跷板框架中双电荷标量的敏感性，重点关注双电荷标量主要衰变成同号W玻色子对的情况。受μTRISTAN提议的启发，我们考虑在质心能量为2 TeV、积分亮度为1 ab⁻¹的简并三重态能谱作为基准。在全强子W衰变模式下研究信号过程，得到特征性的μ⁺μ⁺ + 8j末态。我们基于高喷注多重性和全局强子W重建开发了一种基于切割的分析方法，然后通过利用重建的W可观测量、全局事件运动学、多玻色子变量和旁观μ子信息的多变量策略提高其敏感性。最佳设置对高达425 - 430 GeV的双电荷标量质量达到2σ敏感性水平，比基于切割的探测范围扩展了几十GeV。这表明优于当前LHC的覆盖范围，同时基于定性不同的产生模式和对撞机环境提供了独立探测。
英文摘要
We investigate the sensitivity of a same-sign $μ^+μ^+$ collider to doubly charged scalars in the Type-II seesaw framework, focusing on the regime in which the doubly charged scalar decays dominantly into same-sign $W$-boson pairs. Motivated by the $μ$TRISTAN proposal, for a benchmark we consider a degenerate triplet spectrum at a center-of-mass energy of $2~{\rm TeV}$ and an integrated luminosity of $1~{\rm ab}^{-1}$. The signal process is studied in the fully hadronic $W$-decay mode, leading to a characteristic $μ^+μ^+ + 8j$ final state. We develop a cut-based analysis based on high jet multiplicity and global hadronic $W$ reconstruction, and then improve its sensitivity with a multivariate strategy exploiting reconstructed $W$ observables, global event kinematics, multi-boson variables and spectator-muon information. The best-performing setup reaches a $2σ$ sensitivity level for doubly charged scalar masses up to $425-430~{\rm GeV}$, extending the cut-based reach by a few tens of GeV. This indicates an improvement over the current LHC coverage, while also providing an independent probe based on a qualitatively different production mode and collider environment.
