Speaker
Description
We present a search for long-lived particles (LLPs) decaying to displaced jets in the CMS Hadron Calorimeter (HCAL). The analysis uses data produced by proton-proton collisions at sqrt(s)=13.6 TeV from the first two years of Run 3 of the Large Hadron Collider (LHC), corresponding to an integrated luminosity of 63 fb^-1. It is the first Run 3 analysis to rely on the data collected from the new hardware-level calorimeter LLP triggers, as well as the first search to use the Run 3 HCAL depth segmentation from the recent CMS Phase I upgrade. Significant gains in trigger sensitivity are enabled at the intermediate lifetime range (0.5-3 m), expanding coverage for LLPs decaying within the calorimeter volume. This analysis integrates calorimeter and tracking-based variables into a custom deep neural network to identify highly displaced jets, which tend to be trackless and have unique energy deposition patterns. Results are interpreted in the context of a Higgs portal model, in which the Standard Model Higgs boson or a heavy Higgs decays to two long-lived particles, which each subsequently decay to two bottom quarks. This calorimeter-driven search provides leading sensitivity to LLPs with a lifetime of 1 m, complementing existing tracker- and muon spectrometer-based searches.
| I read the instructions above | Yes |
|---|