Speaker
Description
This talk presents a new secondary-vertexing technique based exclusively on StandAlone muon tracks reconstructed in the ATLAS Muon Spectrometer. These tracks, formed from Muon Spectrometer measurements without an associated Inner Detector track, naturally arise from highly displaced muon decays and are extremely rare for Standard Model processes. By exploiting the full detector-wide track extrapolation model and a dedicated Kalman-filter-based vertex fit, this method enables the reconstruction of dimuon vertices throughout the ATLAS detector volume, well beyond the reach of conventional Inner Detector–based approaches.
The algorithm is demonstrated on benchmark LLP scenarios spanning a wide range of masses, boosts, and decay topologies, and is validated in Run~3 data using a novel tag-and-probe strategy based on $J/\psi \to \mu\mu$ decays reconstructed solely with Muon Spectrometer information. This approach opens access to a previously unexplored region of LLP phase space and provides a powerful new tool for the ATLAS long-lived particle search program.
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