Triggering On Hadronic Tau Decays: A challenge met by ATLAS

TL;DR

This paper discusses the development and performance of tau lepton triggers in the ATLAS experiment at the LHC, crucial for Higgs and BSM physics analyses, including efficiency measurements and future improvements.

Contribution

It presents the first detailed efficiency measurements of hadronic tau triggers in ATLAS at 7 TeV and outlines plans for future trigger algorithm enhancements.

Findings

Achieved effective tau trigger efficiencies in 2011 data

Demonstrated the importance of tau triggers for physics analyses

Outlined future developments for higher luminosity conditions

Abstract

The ATLAS experiment at the Large Hadron Collider (LHC) has been able to collect 5.25 fb-1 of data in 2011. For many physics analyses both in context of the Standard Model (SM) and Beyond the Standard Model (BSM) theories such as Higgs boson searches, tau leptons play an important role. Thus, triggering on hadronic tau decays is an essential ingredient for the success of those measurements. This contribution will summarize the developed efforts to meet this challenge. Efficiency measurements using data taken in 2011 at a center-of-mass energy of 7 TeV are described and results are presented. An outlook on further developments of the tau trigger algorithms, to match future requirements and higher instantaneous luminosities are summarised in the end.