Wing Sheung Chan

Event selection and classification 71 (a) 0 20 40 60 80 100 120 140 ) [GeV] miss T E , µ ( T m 0 20 40 60 80 100 120 140 ) [GeV] miss T E , τ ( T m 0 0.001 0.002 0.003 0.004 0.005 0.006 Simulation ATLAS = 13 TeV s τ µ → Z Signal (b) (c) 0 20 40 60 80 100 120 140 ) [GeV] miss T E , µ ( T m 0 20 40 60 80 100 120 140 ) [GeV] miss T E , τ ( T m 0 0.0005 0.001 0.0015 0.002 0.0025 0.003 Simulation ATLAS = 13 TeV s τ τ → Z (d) (e) 0 20 40 60 80 100 120 140 ) [GeV] miss T E , µ ( T m 0 20 40 60 80 100 120 140 ) [GeV] miss T E , τ ( T m 0 0.0002 0.0004 0.0006 0.0008 0.001 0.0012 ATLAS -1 = 13 TeV, 139 fb s fakes had-vis τ → Events with jet (f) Figure 4.1.: A schematic representation of the typical topology of a (a) signal Z → `τ , (c) Z → ττ or (e) W +jets event, as seen in the transverse plane. The two-dimensional histograms show the distributions of m T ( τ had - vis , E miss T ) versus m T ( µ, E miss T ) of (b) simulated Z → µτ events, (d) simulated Z → ττ events and (f) estimated jet → τ had - vis fakes in the SR without the cuts on m T ( τ had - vis , E miss T ) and m T ( µ, E miss T ) . The colours represent the fraction of events in each bin.