HL-LHC detector upgrades

The High-Luminosity Large Hadron Collider (HL-LHC) will deliver an order-of-magnitude increase in integrated luminosity compared to the current era of LHC operations. The dataset collected in the HL-LHC era will enable unprecedented precision in Standard Model measurements and increase sensitivity to rare or beyond-Standard-Model phenomena. To fully exploit this regime, the CMS and ATLAS experiments are undergoing extensive upgrades to their detectors, triggering systems, and computing infrastructures. This talk will present an overview of the major upgrade elements, including new low-density radiation tolerant trackers, high-granularity calorimeters, precision timing layers, radiation-hard front-end electronics, and next-generation real-time data-processing architectures. I will highlight the technological innovations driving these advancements, the expected performance improvements, and the challenges of operating in extreme pileup conditions. Together, these upgrades will position CMS and ATLAS to maximize the physics potential of the HL-LHC era.