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High energy physics aims to comprehend the fundamental particles that make up all matter. While the Standard Model provides an excellent framework for interpreting most particle interactions, it also serves as a springboard for investigating deeper questions like mass origins, the matter-antimatter asymmetry in the cosmos, dark matter's nature, Big Bang physics, and space-time's microscopic structure. To explore these mysteries, scientists rely on high-energy particle collisions. Princeton researchers play a key role in the CMS experiment at CERN's Large Hadron Collider (LHC) in Switzerland. Within a decade, the LHC will undergo upgrades to boost collision particle density. The future High Luminosity-LHC (HL-LHC) will necessitate significant CMS experiment enhancements. Princeton's CMS team contributes to multiple upgrade projects, including the outer tracker, MIP timing detector, Level-1 trigger system, and computational improvements via the IRIS-HEP software institute.