Robert Zitoun, Stony Brook and LAPP

1
High pT track matching

• EMID official em_util package
• Plots for p11.09

2
Efficiency

• Efficiency computed on Z sample. Takes into
  account possible correlation (cf Run I)
• Tracks limited to hlt0.8 because of trigger
• p10.15 efficiency was 70 using all possible
  chunks on our private Z sample for ICHEP
• Independant sample processed with p11.11
  various algorithms

3
High pT track matching (data)
4
High pT track matching (MC)
5
MET Monitoring per LBN
6
Offset corrections

• Offset distribution
• Before/after distributions

7
Unclustered energy calibration

• Calibrate on Z events pT(meas) k pT(Z)
  uTwith ltuTgt 0
• k 3 methods

modulus
bisector
0.53 ?0 .06
0.50 ?0.08
balancing
0.59 ? 0.07
8
Unclustered energy calibration (MC)

• All 3 methods yield k 0.73 ? 0.03 compared to
  data k 0.55
• Strategy
• do not correct data with 0.55 AND Monte Carlo
  with 0.73
• ONLY correct Monte Carlo to look like data

9
Underlying event correction

• uT calibration with Z eventsProject recoil on Ox
  and Oy
• Data sx 6.7 GeV and sy 5.5 GeV
• MC sx 4.4 GeV and sy 4.0 GeV
• Smear Monte Carlo to look like data
• x 4.5 GeV y 2.9 GeV