Speaker: Christopher Madrid (FNAL)

Abstract: As the High-Luminosity LHC (HL-LHC) era approaches, the Compact Muon Solenoid (CMS) experiment at CERN has embarked on a significant upgrade with the introduction of the MIP Timing Detector (MTD). Designed to combat the anticipated high levels of pile-up, the MTD promises to measure the time-of-arrival of minimum ionizing particles with a sharp resolution of 30-40 ps. It is an exciting venture aimed at preserving the renowned particle identification and reconstruction capabilities of CMS. Central to the MTD's structure are the Endcap Timing Layer (ETL) utilizing low-gain avalanche diode (LGAD) sensors, and the Barrel Timing Layer (BTL) that integrates LYSO:Ce crystals with SiPMs. The incorporation of timing data into CMS will rejuvenate event reconstruction quality, even with closely spaced vertices. In this presentation, we will delve into the MTD's design, share the latest on prototyping and test beam results, and highlight its potential impact on CMS's performance at the HL-LHC.