JES Resolution

1
JES Resolution

• Analysis specific
• Generic larger issues

2
Asymmetric Errors
0-100
160-500
100-160
3
JES Resolution Asymmetry
This is potentially nasty.
0
0.5
1.0
This plot is done on all data. No efficient jet
cut.
4
Asymmetry
80-100
40-60
100-160
60-80
Note Asymmetry can be 1.0 1.5.
5
Asymmetry Variable
A
A
x - 1
6
How Can This Be?
corrJCCB
JCCB 3 jets, two balancing and a small
one corrJCCB 2 jets, one large and one
small Basically one real jet failed jet quality
cuts Redo insisting JCCB corrJCCB 2
JCCB
7
Improved Cuts
40-60
y N exp(Ax3 Bx2 Cx) c2/dof 11/19 0.58
Gaussian c2/dof 13.9/20 0.70
60-80
Asymmetry no longer a problem
Y N exp(Ax3 Bx2 Cx) c2/dof 10/21 0.48
Gaussian c2/dof 19.1/21 0.91
8
JES v5.3 Energy Resolution(Fixed)
9
JES v5.3 Energy ResolutionJet QC fixed
OLD
NEW
Visible improvement.
10
New and Improved ds/dpt
Final answer!

• Remaining issues
• 90-100 GeV point.
• JT25, guessed threshold
• Residual JES issues.
• (see next)
• D0Note in preparation.
• Final to QCD and/or EB imminent.
• On to 2VTX land.

11
JES v5.3
STD JES 5.3 gives a 3.8 offset for m-tagged
jets. It is independent of Pt (75-250 GeV).
Maybe higher above that. Need to rebin and
revisit the idea that the muon Pt may be
mis-measured. Same plot when scaling the
m-tagged jets by 3.8.