2018 Tau Trigger Reconstruction Comparison

The high level trigger (HLT) reconstructed hadronically decaying tau leptons with a cone-based reconstruction algorithm throughout Run I and the first portion of Run II. In 2018, the Hadron Plus Strips (HPS) hadronic tau reconstruction algorithm, which is currently used for offline analysis, was introduced to the HLT to test its performance. In early June 2018, many of the hadronic tau trigger paths switched from the cone-based to the HPS reconstruction algorithm after showing simultaneous rate reductions and efficiency gains.