A quasi-elusive lepton: catching it in the ATLAS tau trigger system

by Antonio De Maria

Wednesday Jan 28, 2026, 1:00 PM → 2:00 PM Europe/Madrid

IFAE Seminar Room (In-person)

An efficient and reliable trigger system is fundamental to guarantee the recording of high quality data within the allowed bandwidth of the ATLAS experiment. Among the hadronic signatures, triggering on genuine hadronic tau decays over a large transverse momentum interval presents several challenges due to the different tau decay product topologies and the similarities to hadronic jets. Dedicated algorithms  aiming to reconstruct taus are implemented both in the hardware-based level-1 (L1) trigger and the software-based high level trigger (HLT). This presentation will review the hadronic tau reconstruction and identification workflow at trigger level, the performance and improvements throughout the LHC Run 3 data taking and possible new ideas for 2026 data taking.