Investigating the Decay of Long-Lived Particles in Hidden Valley Models with CMS*

This project aims to complete a feasibility study of the use of muon detector shower objects combined with displaced tracks for the detection of Hidden Valley dark showers. To do this, an algorithm needs to be designed to define the muon detector shower and the displaced track (dark shower object). The Hidden Valley dark shower model simulation samples will be used to measure detection efficiency to obtain a rough estimation of search sensitivity. The simulated samples of LLPs with different lifetimes are studied by analyzing decay particle showers in the Cathode Strip Chamber (CSC), the Drift Tube (DT), and the Tracker in the Compact Muon Solenoid (CMS).