The ATLAS tau trigger and planned trigger efficiency studies with early data

• The tau trigger system of the ATLAS detector has been developed to increase the sensitivity ofthe detector to the Higgs boson and searches for physics beyond the Standard Model.  A trigger system split in three levels has been designed for hadronically decaying tau leptons optimized for efficiency and good background rejection.  At the first level the trigger uses only information from the calorimeters while the other two levels include also information from the tracking.  Both energy and shape variables for the hadronic tau jets are used in the trigger algorithms.  The very intense QCD background, however, makes it a challenge to develop an efficient trigger with high purity at low transverse momentum. Thus the tau trigger is best used in combination with other trigger variables such as missing transverse energy or jets.  Before the tau trigger can be used in searches, it has to be commissioned with data and the efficiency and background rejectionof QCD has to be studied in detail.

Ämnesord

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

Nyckelord

ATLAS

LHC

CERN

Trigger

Tau lepton

Elementary particle physics

Elementarpartikelfysik

Fysik med inriktning mot elementarpartikelfysik

Physics with specialization in Elementary Particle Physics

Publikations- och innehållstyp

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