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Abstract: The outer shell of the ATLAS experiment at the LHC consists of a system oftoroidal air-core magnets in order to allow for the precise measurement of thetransverse momentum p$ T$ of muons, which in many physics channels are asignature of interesting physics processes. For the precise determination ofthe muon momentum Monitored Drift Tube chambers MDT with high positionaccuracy are used, while for the fast identification of muon tracks chamberswith high time resolution are used, able to select muons above a predefinedp$ T$ threshold for use in the first Level of the ATLAS triggering systemLevel-1 trigger. When the luminosity of the LHC will be upgraded to 4-5 timesthe present nominal value SLHC in about a decade from now, an improvement ofthe selectivity of the ATLAS Level-1 triggering system will be mandatory inorder to cope with the maximum allowed trigger rate of 100 kHz. For the Level-1trigger of the ATLAS muon spectrometer this means an increase of the p$ T$threshold for single muons. Due to the limited spatial resolution of thetrigger chambers, however, the selectivity for tracks above ~20 GeV-c isinsufficient for an effective reduction of the Level-1 rate. We describe howthe track coordinates measured in the MDT precision chambers can be used todecisively improve the selectivity for high momentum tracks. The resultingincrease in latency will also be discussed.



Autor: Jörg Dubbert, Sandra Horvat, Oliver Kortner, Hubert Kroha, Robert Richter

Fuente: https://arxiv.org/







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