The ATLAS tau trigger and planned trigger efﬁciency studies with early data
2009 (English)In: Proceedings of CHarged2008 / [ed] T. Ekelöf, J. Rathsman, Trieste: Proceedings of Science , 2009, 1-7 p.Conference paper (Refereed)
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.
Place, publisher, year, edition, pages
Trieste: Proceedings of Science , 2009. 1-7 p.
, Proceedings of Science, ISSN 1824-8039
ATLAS, LHC, CERN, Trigger, Tau lepton
Research subject Physics with specialization in Elementary Particle Physics
IdentifiersURN: urn:nbn:se:uu:diva-142227OAI: oai:DiVA.org:uu-142227DiVA: diva2:387153
Prospects for Charged Higgs Discovery at Colliders