Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 62: Instrumentation XIII

HK 62.1: Talk

Friday, March 31, 2017, 14:00–14:15, F 102

Electron Identification with the ALICE TRD using the TMVA Toolkit — •Martin Kroesen for the ALICE collaboration — Physikalisches Institut, Universität Heidelberg

The ALICE Transition Radiation Detector (TRD) provides excellent electron identification via the measurement of specific energy loss and transition radiation (TR). The ALICE TRD is uniquely designed to record the time evolution of the signal, where at large drift times the TR contribution is measured. This allows a better electron/pion discrimination compared to measurements of the total integrated charge. The TMVA framework (Toolkit for Multivariate Analysis) in ROOT provides different non-linear statistical modeling tools. Neural Networks and other methods from TMVA are studied to maximize the separation power between electrons and pions taking into account the temporal evolution of the signal. These methods also consider the time-dependent correlations of the signal, which provides better electron/pion discrimination compared to standard simplified likelihood methods.