Resolution from Dijet Asymmetry in CMSSW_1_3_1

1
Resolution from Dijet Asymmetry in CMSSW_1_3_1

• Agata Smoron
• UIC
• 7/31/07

2
Introduction

• Asymmetry is defined as
• A (ETjet1 ETjet2)/(ETjet1 ETjet2),
• where jet1 and jet2 are the two leading jets in
  the event
• To obtain the true dijet system, the asymmetry
  was plotted for ETjet3 cuts of 4, 6, 8, 10, 12,
  15, 17, 20, 30 and 40 GeV
• Then the resolution was extrapolated to true
  dijet system with ETjet3 0 GeV
• The phi angle between the leading jets was
  restricted to ?f gt 155
• The final resolution is obtained by subtracting
  the particle level resolution from the
  reconstructed resolution
• s(ET)/ET2 s(ET)/ET2calo _ s(ET)/ET2gen

3
Asymmetry distribution with different cut on the
3rd jet 40 lt pt lt 55)
4
Resolution as a function of Et3 threshold
5
Resolution using Midpoint Cone 5
6
Resolution using Iterative Cone 5
7
Resolution using Fast Kt06
8
Resolution using FastKt10