JES Resolution

• Analysis specific

• Generic larger issues

Asymmetric Errors

0-100

100-160 160-500

2

) w/o()w/ ( tt PP

) w/o()w/ (

) w/o()w/ (2

tt

tt

PP

PP

) w/o()w/ (

) w/o()w/ (2

tt

tt

PP

PP

) w/o()w/ (

) w/o()w/ (2

tt

tt

PP

PP

JES Resolution [Asymmetry]

) w/o()w/ (

) w/o()w/ (2

tt

tt

PP

PP

0 0.5 1.0

CxBxAxNeF 23

This is potentially nasty.

This plot is done on all data. No efficient jet cut.

Asym

metry

40-60 80-100

60-80 100-160

Note:Asymmetry canbe 1.0 – 1.5.

Asymmetry Variable

no ,

,

t

t

P

P

yx

yx

PP

PPA

tt

tt

2) w/o()w/ (

) w/o()w/ (2

A

A

no ,

,

t

t

P

P

x - 1

How Can This Be? Key:

Jet [Area ~ Pt]

Track connected to PVTrack not connected to PVTrack connected to 2VTXRECO Muon

corrJCCB

JCCB

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

Improved Cuts

40-60

60-80

Gaussian:2/dof = 19.1/21 = 0.91

Gaussian:2/dof = 13.9/20 = 0.70

Y = N exp(Ax3 + Bx2 + Cx):2/dof = 10/21 = 0.48

y = N exp(Ax3 + Bx2 + Cx):2/dof = 11/19 = 0.58

Asymmetry no longer a problem

JES v5.3 Energy Resolution

(Fixed)

2

222

CP

S

P

N

P ttt

90.0315

8.102

dof

JES v5.3 Energy Resolution

[Jet QC fixed]

OLD

NEW

Visible improvement.

New and Improved d/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.

JES v5.3

STD JES 5.3 gives a 3.8% offset for -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 -tagged jets by 3.8%.

2

) w/o()w/ ( tt PP

) w/o()w/ (

) w/o()w/ (2

tt

tt

PP

PP

) w/o()w/ (

) w/o()w/ (2

tt

tt

PP

PP

2

) w/o()w/ ( tt PP