Ponente
Sr.
Takashi Mitani
(Waseda University)
Descripción
Triggering on hadronic tau decays at ATLAS is essential for a wide
variety of analyses of interesting physics processes at ATLAS. Among
those are the measurement of the Higgs boson in the di-tau final state
and multiple searches for physics beyond the Standard Model. The
ATLAS tau trigger combines information from the tracking detectors and
calorimeters to identify the signature of hadronically decaying tau
leptons.
In 2015 the trigger strategies will become more important than ever
for physics analyses. Under the demanding high luminosity scenario of
the LHC Run 2, with instantaneous luminosities up to 2x10^34
cm^-2s^-1, one of the major challenges will be to sustain high
efficiencies and background rejection in events with up to 50
overlapping interactions. In this environment single-tau triggers
suffer from severe rate limitations, despite the sophisticated
algorithms that are used in the tau identification. Hence, new
algorithms with improved resolution, multi-variate selection
techniques, and new topological trigger criteria at hardware level are
being developed. Novel high-speed tracking methods will be deployed to
deal with the much larger event rate.
Measurements of the tau trigger performance during Run1 will be
presented. An overview of the developments for an efficient tau
trigger in Run 2 will be given.
Autores primarios
Dr.
Francesca Pastore
(Royal Holloway University of London (UK))
Dr.
Joerg Stelzer
(CERN)
