Study of non-collision background from cosmic muons

This report describes the work done as CERN Summer Student project. One of the unavoidable non-collision backgrounds in the experiments at the Large Hadron Collider is the background from cosmic muons. In this work the flow of the cosmic muons is considered and events with cosmic muons and ATLAS detector are simulated. As a result the contribution of cosmic muons to events reconstructed with the ATLAS detector from pp-collisions is estimated.