Initial studies of the first level muon trigger efficiency for the LHC-ATLAS experiment

In this work, initial studies of the first level trigger of muon triggering with the Resistive Plate Chambers (RPCs) in the barrel region of the muon spectrometer of the LHC (Large Hadron Collider) ATLAS experiment are summarized. For these studies, four different simulation data sets with transverse momenta p/sub T/ = 6 GeV/c (low- p/sub T/) and p/sub T/ = 20 GeV/c (high-p/sub T/), both for mu /sup + / and mu /sup -/, were used. Z/sub diff/ variable, calculated using the muon hits in the RPCs, was studied for oppositely charged muons and we showed that it will be possible to tell if it is mu /sup +/ or mu /sup -/ during triggering. The trigger efficiencies for muons with p/sub T/ = 6 GeV/c and P/sub T/ = 20 GeV/c momenta were found to be around 95%.