Wing Sheung Chan

Signal and background modelling 89 0 20 40 60 80 100 120 140 160 180 200 220 Events / 0.05 Simulation ATLAS -1 = 13 TeV, 139 fb s polarisation τ Unpolarised Left-handed Right-handed 1P τ e SR, 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Combined NN output 0.6 0.8 1 1.2 1.4 Ratio 0 10 20 30 40 50 60 70 80 Events / 0.05 Simulation ATLAS -1 = 13 TeV, 139 fb s polarisation τ Unpolarised Left-handed Right-handed 3P τ e SR, 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Combined NN output 0.6 0.8 1 1.2 1.4 Ratio 0 50 100 150 200 250 300 Events / 0.05 Simulation ATLAS -1 = 13 TeV, 139 fb s polarisation τ Unpolarised Left-handed Right-handed 1P τ µ SR, 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Combined NN output 0.6 0.8 1 1.2 1.4 Ratio 0 20 40 60 80 100 Events / 0.05 Simulation ATLAS -1 = 13 TeV, 139 fb s polarisation τ Unpolarised Left-handed Right-handed 3P τ µ SR, 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Combined NN output 0.6 0.8 1 1.2 1.4 Ratio Figure 5.1.: Combined NN output distributions in the SR before and after the τ polarisation reweighting. The ratios of the reweighted distributions to the original distributions (corresponding to the scenario with unpolarised τ leptons) are shown in the bottom panels. The signal is normalised to B ( Z → `τ ) = 10 − 5 . The error bars represent the MC statistical uncertainties.