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Speaker: Gillian Kopp (Princeton University) – Title: Enabling Novel Long-Lived Particle Searches through 5D Calorimetry in the CMS Experiment
November 21 @ 4:00 pm - 5:00 pm
Research Progress Meeting
Date: November 21, 2024
Time: 4:00- 5:00 pm
Location: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]
Speaker: Gillian Kopp (Princeton University)
Title: Enabling Novel Long-Lived Particle Searches through 5D Calorimetry in the CMS Experiment
Abstract: The Compact Muon Solenoid (CMS) experiment records proton-proton collisions from the LHC to measure properties of the Standard Model and search for new physics. Recently, long-lived particles have emerged as a compelling direction in which to search for physics beyond the Standard Model. As these searches are typically limited by the event selection, implementing dedicated long-lived particle (LLP) triggers provides an excellent avenue to expand experimental coverage into this challenging parameter space. A novel hardware-level LLP trigger has been developed and implemented in the CMS experiment for Run 3 (2022-2026), exploiting the recent hadron calorimeter (HCAL) upgrade. The hardware- and firmware-based trigger algorithm identifies delayed jets, resulting from the decay of massive LLPs, and displaced jets, resulting from LLPs that decay inside the HCAL. This approach significantly increases sensitivity to LLP signatures with soft hadronic final states, including exotic decays of the Higgs boson. I review the trigger implementation, calibration, and performance, showing results from recent HCAL timing scans that produce artificially delayed jets. The data collected with the new triggers provides a first look at the capabilities to capture softer events and expand the phase space accessible in LLP searches.
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