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We propose an approach to derive longitudinal shower development informationfrom the longitudinally unsegmented BABAR electromagnetic calorimeter by usingtracking information. Our algorithm takes advantage of the goodthree-dimensional tracking resolution of BABAR, which provides an independentgeometric constraint on the shower as measured in the BABAR crystalcalorimeter. We show that adding the derived longitudinal shower developmentinformation to standard particle identification algorithms significantlyimproves the low-momentum separation of pions from electrons and muons. We alsoverify that the energy dependence of the electromagnetic shower development wemeasure is consistent with the prediction of a standard electromagnetic showermodel.

Extracting longitudinal shower development information from crystal calorimetry plus tracking