The general scheme for the fast, pipelined rst level trigger on high pt muons in the CMS detector at LHC is presented. The prototype PACT system was tested in the high momentum muon beams in the RD5 experiment during 1993/94 runs. The obtained eciency curves are shown.
The momentum and angular distributions of punchthrough muons have been measured after a 10 lambda calorimeter using an iron toroid magnet with 1.5 T as spectrometer-The calorimeter was inside a variable magnetic field of 0 to 3 T. The incident momentum of the pi(-) beam ranged from 20 to 300 GeV/c. Measurements were also done at some beam momenta for pi(+) K+ and p. The results are compared with Monte Carlo predictions. A parameterization for the momentum spectrum of punchthrough muons was derived from the data
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