Inclusive Muon Production In 900 Gev P-P Collisions With Atlas Detector

The observation of the inclusive muon production in p-p collisions at a center-of-mass energy of 900 GeV with the ATLAS detector at LHC is presented. Data used for these studies were collected using a minimum-bias trigger in the December run. The method to select muons coming from collisions is illustrated together with a first comparison of the distributions of these muons with the expected ones from the minimum-bias Monte Carlo samples.