Electron/Pion Identification in the CBM TRD Applying a w~k Goodness-of-Fit Criterion

摘要

The problem of electron/pion identification in the CBM experiment based on the measurements of energy tosses and transition radiation in the TRD detector is discussed. Earlier we analyzed a possibility to solve such a problem using an artificial neural network (ANN) W. Here we consider an approach based on a nonparametric ω_n~k goodness-of-fit criterion, and comparison with the ANN method is also performed. We show that both methods provide a comparable level of pion suppression and electron identification, the ω_n~k test is more simple for practical applications, the ANN method provides the needed level of pions suppression only if " clever" variables are used. We demonstrate that application of the ω_n~k -criterion to the J/ reconstruction provides a high level of pion background suppression and significantly improves a signal-to-background ratio.