Abstract
The ATLAS (A Toroidal LHC ApparatuS) trigger system is designed to keep high effiency for interesting events while achieving a rejection of low transverse momentum ( p T ) physics of about 10 7 , thus reaching the ∼200 Hz data storage capability of the Data Aquisition system. A three levels structure has been implemented for this purpose, as described in this work for the case of the muon trigger system. After describing the implementation, some performance results are presented in terms of final trigger rates, resolutions, efficiencies, background rejection and algorithm latency.
Highlights
12 April 2007The ATLAS (A Toroidal Large Hadron Collider (LHC) ApparatuS) trigger system is designed to keep high effiency for interesting events while achieving a rejection of low transverse momentum (pT ) physics of about 107, reaching the ∼200 Hz data storage capability of the Data Aquisition system
High pT muons are important for many known processes, that can be used for monitoring and calibration (Z → μμ), and for several new phenomena (Higgs, SUSY), predicted at the energy of the Large Hadron Collider (LHC)
∗sergio.grancagnolo@le.infn.it, I.N.F.N. fellow, Dipartimento di Fisica, via Arnesano, 73100 Lecce, Italy. It consists of resistive plate and thin gap trigger chambers (RPC and TGC) and precision detectors consisting of monitored drift tubes (MDT) and cathode strip chambers (CSC)
Summary
The ATLAS (A Toroidal LHC ApparatuS) trigger system is designed to keep high effiency for interesting events while achieving a rejection of low transverse momentum (pT ) physics of about 107, reaching the ∼200 Hz data storage capability of the Data Aquisition system. A three levels structure has been implemented for this purpose, as described in this work for the case of the muon trigger system. Some performance results are presented in terms of final trigger rates, resolutions, efficiencies, background rejection and algorithm latency
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