No. 23 (00104) Family name : Beringer Given name : Juerg Affiliation : CERN Abbreviation : E-mail address : juerg.beringer@cern.ch Title : Physics Validation of Detector Simulation Tools for LHC Authors : Juerg Beringer Abstract : Extensive studies to validate the physics processes built into the detector simulation tools Geant4 and Fluka are in progress within all LHC experiments, within the collaborations developing these tools, and within the LCG Simulation Physics Validation Project, which has become the primary forum for these activities. This work includes detailed comparisons with test beam data, as well as benchmark studies of simple geometries and materials with single incident particles of various energies for which experimental data is available. I will give an overview of these validation activities with emphasis on the latest results.