Simulation studies on the muon triggering capability of the ME0 GEM station in the CMS experiment

The CMS muon system is designed to be highly redundant in order to provide good momentum estimation and an efficient trigger selection. Redundancy will be even more important during the High Luminosity operation of the LHC (HL-LHC). On the other hand, the forward region of the CMS muon system has less redundancy in the very high pseudora-pidity region. Several upgrades for HL-LHC based on different technologies are planned to overcome this weakness, including the installation of several stations of GEM based muon detectors. Among these, the ME0 station will not only improve redundancy and trigger efficiency, but also extend the muon system coverage to higher pseudorapidity. This will increase the acceptance for forward muons in final states of new physics. The ME0 station will be composed of six layers of GEM detectors, in order to make up for the dearth of information in the high pseudorapidity region. A specific trigger is being developed and needs to be integrated into CMS, using the lepton flavour violation decay of $\tau \rightarrow 3\mu $ as a benchmark physics scenario. The current status of this study is described.