Abstract
The ATLAS Trigger-DAQ system will be significantly upgraded to explore new physics beyond the standard model in the High-Luminosity LHC environment with instantaneous luminosity of up to 7.5⨯1034 cm -2 s-1 . Two general trigger schemes are under study and their prospects and concerns are discussed. The muon trigger and readout electronics will be totally replaced to cope with a longer latency and a higher trigger rate. At the same time, new trigger algorithms using the precision tracker will be introduced to sharpen efficiency turn-ons and suppress fake triggers. The algorithm and the expected performance of the muon trigger are described. The hardware based track trigger is one of the major items introduced in the upgrade program. It will improve the trigger performance of various trigger items with a combination of the calorimeter or muon signature. The procedure for processing track information and an expected performance on the electron trigger are presented.
Highlights
The ATLAS Collaboration [1] is planning make significant upgrades to the trigger-DAQ system to achieve the best reach to new physics beyond the standard model in the High-Luminosity LHC
The Level-0 muon trigger (L0Muon) is a part of the ATLAS Level-0 trigger system and a major upgrade on both on-detector and off-detector electronics is planned to profit from the longer Level-0 trigger latency of 10 μs and maximum trigger rate of 1 MHz
The Level-0 muon trigger will be totally renewed with information from the precision tracker, Monitored Drift-Tube (MDT), being introduced in the first step of the hardware trigger
Summary
The ATLAS Collaboration [1] is planning make significant upgrades to the trigger-DAQ system to achieve the best reach to new physics beyond the standard model in the High-Luminosity LHC program. The system is designed to maintain the trigger thresholds at the peak luminosity of 7.5 × 1034cm−2 s−1 at similar levels to the LHC Run-1 period when the instantaneous luminosity was 0.7 × 1034cm−2 s−1 and keep the physics acceptance as large as possible. In the Level-1 trigger, track information from the ATLAS inner tracker will be available on the hardware trigger. Combining this with the output of the Level-0 calorimeter and muon signature will significantly reduce the trigger rate of a number of trigger items. As an example the expected performance of the single electron trigger is described, and a summary is given in the last section As an example the expected performance of the single electron trigger is described in Section 4, and a summary is given in the last section
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