Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 74: Gaseous Detectors II

T 74.1: Talk

Thursday, March 19, 2026, 16:15–16:30, KH 01.014

Upgrading the CMS muon end cap for the high-luminosity LHC using ME0 GEM detectors — Erik Ehlert, Kerstin Hoepfner, Daniel Klee, Alexander Schmidt, and •Shawn Zaleski — III. Physikalisches Institut, RWTH Aachen University, Aachen, Germany

Gas electron multiplier (GEM) chambers have been operating as part of the CMS Muon end cap system since the beginning of Run 3. The GE1/1, first GEM system installed alongside the CSC chambers, provides an improved transverse momentum measurement of muons that pass through the CMS end caps. The ME0 system, a planned upgrade of the CMS Muon system for the high-luminosity LHC, is similar in design to that of the GE1/1 system, however it consists of a stack of six triple-GEM chambers. These ME0 stacks will be installed adjacent to the new high granularity hadron calorimeter (HGCAL) and will extend the pseudorapidity reach of the Muon system from 2.4 to 2.8. The GEM collaboration has built more than six stacks that will be installed during Long Shutdown 3 (LS3). All stacks that will be installed must undergo a rigorous set of quality control (QC) checks, the final of which is testing the full ME0 stack using a cosmic ray muon test stand (QC8). This talk will give an overview of the QC8 setup and present some results from the ME0 cosmic ray test stand QC checks.

Keywords: CMS; Muon; GEM; ME0; LHC