BaBar events simulation production using the INFN-GRID approach

The BaBar experiment has been taking data since 1999, investigating the violation of charge and parity (C P) symmetry in the field of high-energy physics. Event simulation is an intensive computing task, due to the complexity of algorithm based on Monte Carlo method implemented using the GEANT engine. In order to satisfy the experiment requirements, in the traditional BaBar computing model events are distributed over several sites involved in the collaboration where each site manager centrally manages a private farm dedicated to simulation production. The new GRID approach applied to the BaBar production framework is discussed along with the schema adopted for data development via Xrootd servers, including data managements using GRID middle ware on distributed storage facilities spread over the INFN-GRID network. A comparison between the two models is provided, describing also the custom application developed for performing the whole production task on the GRID and showing the results achieved.