Implementation and Performance of a Tau Lepton Selection Within the Atlas Trigger System at the Lhc

Details Implementation and Performance of a Tau Lepton Selection Within the Atlas Trigger System at the Lhc Implementation and Performance of a Tau Lepton Selection Within the Atlas Trigger System at the Lhc

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apsp.conf..546d&link_type=abstract

ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS . Proceedings of the 9th Conference . Held

Physics

Medical Physics

Scientific paper

The ATLAS experiment at the Large Hadron Collider (LHC) has an interaction rate of up to 109 Hz. The trigger must efficiently select interesting events while rejecting the large amount of background. The First Level trigger will reduce this rate to around O(75 kHz). Subsequently, the High Level Trigger (HLT), comprising the Second Level trigger and the Event Filter, will reduce this rate by a factor of O(103). Triggering on taus is important for Higgs and SUSY searches at the LHC. In this paper tau trigger selections are presented based on a lepton trigger if the tau decays leptonically or via a dedicated tau hadron trigger if the tau disintegrates semileptonically. We present signal efficiency with the electron trigger using the data sample A → ττ → e hadron, and rate studies obtained from the dijet sample.

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