Optimization and Performance of the ATLAS Tau Trigger with Cosmics Data

Details Optimization and Performance of the ATLAS Tau Trigger with Cosmics Data Optimization and Performance of the ATLAS Tau Trigger with Cosmics Data

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apsp.conf..511s&link_type=abstract

ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS. Proceedings of the 11th Conference. Held

Physics

Medical Physics

Atlas, Tau, Trigger

Scientific paper

Tau lepton, being the heaviest of all known leptons (mT = 1776.84 ± 0.17MeV), is of special importance. Due to its short lifetime, with (cT = 87.11μm), it decays inside the beam pipe. The identification of tau is, therefore, done through its decay products inside the detector. A tau jet can be identified through the presence of a well collimated calorimeter cluster with a small number of associated tracks.
The tau lepton decays into electron or muons 35% of the time, while 65% of its decays include hadrons, mostly pions. The events where tau decays into leptons can be triggered by low ET threshold electron or muon trigger. A dedicated tau trigger has been designed and implemented at the ATLAS experiment to select events where a tau lepton decays into hadrons. Triggering on tau events will not only help in understanding the standard model (SM) processes during early running but will also increase the discovery potential of the ATLAS detector through searches for Higgs boson and supersymmetric particles at high luminosities.
The cosmics-ray data at ATLAS have provided a valuable handle to optimize and commission the ATLAS detector before beam collisions. In this process the ATLAS tau trigger algorithms have been exercised and the hardware-based first level rates studied.

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