This document summarises proposed searches for new physics accessible in the heavy-ion mode at the CERN Large Hadron Collider (LHC), both through hadronic and ultraperipheral γγ interactions, and that have a competitive or, even, unique discovery potential compared to standard proton–proton collision studies. Illustrative examples include searches for new particles—such as axion-like pseudoscalars, radions, magnetic monopoles, new long-lived particles, dark photons, and sexaquarks as dark matter candidates—as well as new interactions, such as nonlinear or non-commutative QED extensions. We argue that such interesting possibilities constitute a well-justified scientific motivation, complementing standard quark-gluon-plasma physics studies, to continue running with ions at the LHC after the Run-4, i.e. beyond 2030, including light and intermediate-mass ion species, accumulating nucleon–nucleon integrated luminosities in the accessible fb −1 range per month.

中文翻译：

---

在CERN大型强子对撞机上通过重离子碰撞进行新的物理搜索

本文件总结了在CERN大型强子对撞机（LHC）的重离子模式下可通过强子和超外围γγ相互作用获得的新物理的拟议搜索，与标准质子相比，它们具有竞争性甚至独特的发现潜力。质子碰撞研究。示例性示例包括搜索新粒子（例如类似轴突的伪标量，辐射子，磁单极子，新的长寿命粒子，暗光子和六夸克等作为暗物质的候选物），以及新的相互作用（例如非线性或非交换QED）扩展名。我们认为，这种有趣的可能性构成了充分合理的科学动机，是对标准夸克-胶子-等离子体物理研究的补充，是在Run-4之后（即2030年以后）继续在LHC上运行离子的可能性，