Particle fluxes in the LHCb muon system-comparison of GCALOR and MARS calculations

99-036 The main goal of the present study is to determine a possible divergence in the estimations of the background hit rates in the LHCb Muon System due to different methods of approximation of particle interactions with the matter of the detectors. Only backgrounds induced by the pp collisions at the interaction point are considered. The GCALOR and MARS programs were used to calculate particle fluxes in otherwise identical experimental setups using similar physics event generator input. Calculations were performed with a simple model setup as well as with the realistic LHCb description as presented in SICB v119. The particle fluxes and hence the hit rates are shown to agree in both methods within a factor of about 2 in almost all the Muon System elements.