Comparison of predictions for minimum bias event generators and consequences for ATLAS radiation background

This report presents some results for minimum bias events in proton-proton collisions at LHC energies, generated using PYTHIA6.200 and PHOJET1.12 Monte Carlo event generators. Special attention is given to multiplicity distributions, as well as to the cross section predictions provided by both event generators. Our aim is to evaluate the differences in minimum bias predictions from these event generators, which may lead to systematic errors for radiation background calculation performed using transport programs such as FLUKA.