AI 中文总结
利用大型强子对撞机，通过半可见希格斯衰变模式\(H\to \ell^+\ell^- + ~\rm E{\!\!\!/}_T\)和\(H\to jj + ~\rm E{\!\!\!/}_T\)，用六维有效场论处理，经切割分析和多变量BDT分析，探寻新不可见粒子参数空间。
AI 中文摘要
在大型强子对撞机（LHC）上，新物理的搜索以多种形式持续进行，包括新粒子搜索、标准模型（SM）耦合的精确测量以及新不可见粒子信号的搜索。在本次报告中，我们讨论了利用半可见希格斯衰变模式\(H\to \ell^+\ell^- + ~\rm E{\!\!\!/}_T\)和\(H\to jj + ~\rm E{\!\!\!/}_T\)对新不可见粒子参数空间的探测范围。我们首先通过六维有效场论对新不可见粒子及其与SM的相互作用进行参数化。然后研究各自的信号和相应背景，发现信号小背景大。不过，这些过程的运动学足够丰富，能够进行信号提取，我们先用基于切割的分析进行量化，后用多变量BDT进行分析。
英文摘要
Searches for new physics continue at the LHC in several forms, including new-particle searches, precision measurements of SM couplings, and searches for signals of new invisible particles. In this talk, we discuss the reach in parameter space of new invisible particles with the semi-visible Higgs decay modes $H\to \ell^+\ell^- + ~\rm E{\!\!\!/}_T$ and $H\to jj + ~\rm E{\!\!\!/}_T$. We first parametrise the new invisible particles and their interactions with the SM through an effective field theory at dimension six. We then study the respective signals and the corresponding background, finding small signals with large backgrounds. We find, however, that the kinematics of these processes are sufficiently rich to allow a signal extraction that we first quantify with a cut-based analysis and later with a multivariate BDT.
CommentsContribution to the 2026 QCD session of the 60th Rencontres de Moriond. Typos fixed
