1. Pre-selection at least one primary reconstructed vertex (with at least 3 tracks) compatible with the beam spot in the bunch crossing |z vertex | < 150 mm Electrons trigger: L1_EM14 author: 1 (reconstructed as hard electron) or 3 (reconstructed as both hard and soft electron) RobustTight cuts P T cut: E T,cluster > 20GeV η cut: 0 < |η cluster | < 1.37, 1.52 < |η cluster | < 2.47 Missing E T E T > 25GeV Jets P T >20GeV, where P T = EM scale P T * EMJES correction factor |η|<2.8 is good does not count that jet that has ΔR<0.2 with the tight electron W W T,mass = sqrt{2*E el,cluster *[cosh(η el,track )]*E T,miss *[1-cos(Φ miss – Φ el,track )]} W T,mass > 40GeV having at least one jet that passes all the above cuts missing E T cleaning: reject event if at least one jet with P T (EMScale) > 10GeV satisfies: (n 90 ≤ 5 AND f HEC > 0.8) OR |jetTime| > 50 OR (|JetQuality| > 0.8 AND emf > 0.95) discard event if there are at least two electrons that pass through RobustMedium cuts, P T and η cuts Finding the M T of W by using W+jets samples 1

2. Np0 Np1 Np2 Np3 Np4 Np5 the graphs below do not have their y-axes scaled properly x-axis: number of jets that satisfy the cut requirement y-axis: number of events that passes the pre-selection, has missing E T >25GeV and at least one electron satisfy the selection requirement 2

3. Finding the M T of W by using W+jets samples Np0 Np1 Np2 Np3 Np4 Np5 the graphs below do not have their y-axes scaled properly y-axis: number of events that passes all the selections 4

4. Finding the M T of W by using W+jets samples my result (only W  eν) Imai’s result stack the graphs in the previous slide with proper scale (cross- sections) to get… 5