Abstract
For the planned high luminosity upgrade of the Large Hadron Collider, aiming to increase the instantaneous luminosity to 5 × 1034cm−2s−1, the implementation of a first level tracktrigger has been proposed. This trigger could be installed in theyear ∼ 2021 along with the complete renewal of the ATLAS innerdetector. The fast readout of the hit information from the InnerDetector is considered as the main challenge of such a tracktrigger. Different concepts for the implementation of a first leveltrigger are currently studied within the ATLAS collaboration. The socalled "Self Seeded" track trigger concept exploits fast frontendfiltering algorithms based on cluster size reconstruction and fastvector tracking to select hits associated to high momentumtracks. Simulation studies have been performed and results onefficiencies, purities and trigger rates are presented for differentlayouts.
Highlights
Many of the scenarios we can think of today involve objects at the electroweak scale
Using track-cluster matching in ET / pT, a rate reduction of up to a factor ~10 can be achieved electrons hadrons
Spatial cluster filter external trigger information new level L0 trigger required all tracks in regions
Summary
No clear picture about full spectrum of physics analysis at Phase II (L=5·1034 cm-2 s-1 , Year>2022). Many of the scenarios we can think of today involve objects at (or near) the electroweak scale
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