Abstract
After the Phase-2 high-luminosity upgrade to the Large Hadron Collider (LHC), the collision rate and therefore the background rate will significantly increase, particularly in the high η region. To improve both the tracking and triggering of muons, the Compact Muon Solenoid (CMS) Collaboration plans to install triple-layer Gas Electron Multiplier (GEM) detectors in the CMS muon endcaps. Demonstrator GEM detectors were installed in CMS during 2017 to gain operational experience and perform a preliminary investigation of detector performance. We present the results of triple-GEM detector performance studies performed in situ during normal CMS and LHC operations in 2018. The distribution of cluster size and the efficiency to reconstruct high pT muons in proton-proton collisions are presented as well as the measurement of the environmental backgroundrate to produce hits in the GEM detector.
Highlights
Physics DetectorsResolution in the global φ direction, and the partitioning gives a coarse measurement of the η of a particle traversing the detector
A demonstrator GEM detector was installed into the CMS experiment and operated through 2017 and 2018
The goal of the detector was to gain operational experience and do performance studies before the full ring of GEM detectors is operational in Run 3 of the LHC
Summary
Resolution in the global φ direction, and the partitioning gives a coarse measurement of the η of a particle traversing the detector. The detector was operated at a gas gain of ∼ 1 × 104 with a readout charge threshold of 3 fC for eta partitions three to eight With this setting, a measured detection efficiency of 95% for muons is consistent with the test beam data [8]. We present the results of the GEM demonstrator detector’s performance using data collected during normal CMS operations with LHC proton–proton collisions. We present results from data collected on July 8th, 2018, when the GEM detector was incorporated into the full CMS DAQ chain, corresponding to an integrated luminosity of 205.4 pb−1.
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