Applications of Precision Timing to a SUSY Search with Delayed Photons at the Compact Muon Solenoid

The Compact Muon Solenoid (CMS) experiment records data from Large Hadron Collider (LHC) collisions to search for physics beyond the Standard Model, test theories of supersymmetery (SUSY), and precisely measure properties of known particles. To maintain the sensitivity of the CMS experiment, current detectors must be upgraded to mitigate the effects of increased pileup interactions expected at the high-luminosity LHC. New capabilities, such as precision timing in calorimetric devices, have been shown to effectively mitigate the effects due to pileup, and are expected to benefit new physics searches. We present results obtained using a dedicated silicon timing layer identical to that proposed for the CMS High Granularity Calorimeter. This timing layer was tested with high energy electromagnetic showers at the Fermilab Test Beam Facility, and an outstanding time resolution of 16 ps was measured for a 32 GeV beam energy. A simulation of a benchmark dark matter search is presented, and shown that generated particle flight times can be faithfully reconstructed using detector-level information. We thus demonstrate that the search can be performed and its sensitivity is expected to improve with the calorimeter time resolution.