Wing Sheung Chan

Event selection and classification 83 (a) eτ 1P (b) eτ 3P (c) µτ 1P (d) µτ 3P Figure 4.3.: Expected ROC curves for the combined NN output in the 1P and 3P SR of the eτ and µτ channels. The ROC curves for classifying signal events against Z → ττ , W +jets or Z → events are separately shown. The area under the curves (AUC) are shown as a figure of merit. The rather peculiar shape of the ROC curves for the classification of Z → events is mainly due to the low weight given to the NN Z output in the combination.