Grid development at University of Manchester Hardware architecture: - 1 Computer Element and 10 Work nodes Software architecture: - EasyGrid to submit jobs to grid. -Babar software installed at AFS -LCG Grid software -Linux platform Important: Web page with all available information: Dr James Cunha Werner

EasyGrid: Analysis Submission to Grid Single command:./easygrid dataset_name Perform Handlers management and submission Configurable to achieve user’s requirements Software based in State-machine –Verify skimdata available: If not available perform BbkDatasetTCL to generate skimData. Each file will be a job. –Verify if there are handlers pending If not, script generation (gera.c) with edg-job-submit and ClassAdds, and script execution. Nest for submission policy and optimisation. If yes, verify job status. When the all jobs ended, recover results in user folder. (Prototype)

Benchmarks The different behavior of electrons, hadrons, and muons can be distinguished. Performing this analysis takes 7 days using one computer 24 hours a day. Using 10 CPUs in parallel, accessed via the Grid, it took only 8 hours. 18,700,000 events !!! Behavior of particles in the BaBar Electromagnetic Calorimeter (EMC )

Pi+- N Pi0 decays, with N= 1, 2, 3 and 4 Invariant masses of pairs of gammas, as measured by the EMC, from Pi0 decay produce a mass peak at 135 MeV (the peak in the plot). All other combinations are spread randomly around all energies (background). There were 81,700,000 events in the dataset and it took 4 days to run in production, with 26 jobs in parallel: to run it in one single computer would take more than 3 months.

Resonances reconstruction Note the change in resolution between the plots. This is consequence of insignificant branch rate of 4 Pi0 decay.