update on lepton jets met msugra lm 1 systematic uncertainty decomposition n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Update on Lepton+Jets+MET mSUGRA LM-1: Systematic Uncertainty Decomposition PowerPoint Presentation
Download Presentation
Update on Lepton+Jets+MET mSUGRA LM-1: Systematic Uncertainty Decomposition

Loading in 2 Seconds...

play fullscreen
1 / 11

Update on Lepton+Jets+MET mSUGRA LM-1: Systematic Uncertainty Decomposition - PowerPoint PPT Presentation


  • 128 Views
  • Uploaded on

Update on Lepton+Jets+MET mSUGRA LM-1: Systematic Uncertainty Decomposition. Rick & Bobby. Motivating Example: MET (uncorr) From Towers. Total Background LM-1 Signal. Events. Rapidly falls. HLT Applied. . Since this is a Counting Experiment, look at cumulative events passing cuts….

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Update on Lepton+Jets+MET mSUGRA LM-1: Systematic Uncertainty Decomposition' - paley


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
update on lepton jets met msugra lm 1 systematic uncertainty decomposition

Update on Lepton+Jets+METmSUGRA LM-1:Systematic Uncertainty Decomposition

Rick & Bobby

R. Cavanaugh, SUSY/BSM Working Group Meeting

motivating example met uncorr from towers
Motivating Example:MET (uncorr) From Towers

Total Background

LM-1 Signal

Events

Rapidly falls

HLT Applied

Since this is a Counting Experiment,

look at cumulative events passing cuts…

Flatter

MET [GeV]

R. Cavanaugh, SUSY/BSM Working Group Meeting

motivating example met uncorr from towers1
Motivating Example:MET (uncorr) From Towers

Total Background

LM-1 Signal

Rapidly falls:

- B / MET large

Naïve expectation:

Small systematic effects

affecting MET might

lead to large differences

in S / S+B

Cumulative Num. Events Passing Cut

Flatter:

S / MET small

Cut on MET [GeV]

R. Cavanaugh, SUSY/BSM Working Group Meeting

uncertainty definitions considered so far
Statistical:

S+B

Systematical:

Finite MC Statistics

NW / Ngen

QCD level (not shape)

50%

Jet Energy Scale

10% ET

(affects also MET)

Jet Energy Resolution

Additional one ET smearing (ET taken from the DAQ TDR)

(affects also MET)

For Jet Systematics

N = number of events passing cuts before systematic effect applied

Nsyst = number of events passing cuts after systematic effect applied

Uncertainty [number of events]:

B = N – Nsyst

Uncertainty Definitionsconsidered so far…

R. Cavanaugh, SUSY/BSM Working Group Meeting

uncertainty definitions considered so far1
Statistical:

S+B

Systematical:

Finite MC Statistics

NW / Ngen

QCD level (not shape)

50%

Jet Energy Scale

10% ET

(affects also MET)

Jet Energy Resolution

Additional one ET smearing (ET taken from the DAQ TDR)

(affects also MET)

For Jet Systematics

N = number of events passing cuts before systematic effect applied

Nsyst = number of events passing cuts after systematic effect applied

Uncertainty [number of events]:

B = N – Nsyst

Uncertainty Definitionsconsidered so far…

Quick side remark:

10% seems conservative for this study (we assumes 10 fb-1)

Plan to vary JES systematic according to expected dependence on integrated luminosity

8-10% for L < 1fb-1

~3% at some point after 1fb-1

R. Cavanaugh, SUSY/BSM Working Group Meeting

uncertainty definitions considered so far2
Statistical:

S+B

Systematical:

Finite MC Statistics

NW / Ngen

QCD level (not shape)

50%

Jet Energy Scale

10% ET

(affects also MET)

Jet Energy Resolution

Additional one ET smearing (ET taken from the DAQ TDR)

(affects also MET)

For Jet Systematics

N = number of events passing cuts before systematic effect applied

Nsyst = number of events passing cuts after systematic effect applied

Uncertainty [number of events]:

B = N – Nsyst

Uncertainty Definitionsconsidered so far…

Quick side remark:

10% seems conservative for this study (we assumes 10 fb-1)

Plan to vary JES systematic according to expected dependence on integrated luminosity

8-10% for L < 1fb-1

~3% at some point after 1fb-1

Many systematics

not yet considered

(PDFs, muon ID eff, etc)

R. Cavanaugh, SUSY/BSM Working Group Meeting

systematic uncertainty decomposition
Systematic UncertaintyDecomposition

Statistical

MC Statistics

QCD

Jet E Scale

Jet E Resolution

Total

HLT Applied

Uncertainty [number of events]

Cut on MET [GeV]

R. Cavanaugh, SUSY/BSM Working Group Meeting

toy significance decomposition
Toy “Significance” Decomposition

NOTE: The following plots have

HLT applied,

MET cuts applied

NO OTHER CUTS APPLIED!

 significant optimisation

still possible (likely)

  • Statistical only
    • S / S + B
  • Statistical + MC Statistics
    • S / S + B + BMC2
  • Statistical + QCD level
    • S / S + B + 0.5BQCD
  • Statistical + Jet Energy Scale
    • S / S + B + BJES2
  • Statistical + Jet Energy Resolution
    • S / S + B + BRES2
  • Total
    • S / S + B + BMC2 + 0.5BQCD + BJES2 + BRES2

R. Cavanaugh, SUSY/BSM Working Group Meeting

toy significance decomposition1
Toy “Significance” Decomposition

Statistical only

Statistical + MC Statistics

Statistical + QCD

Statistical + Jet E Scale

Statistical + Jet E Resolution

Total

“Significance”

HLT applied,

MET cuts applied

NO OTHER CUTS APPLIED!

 significant optimisation

still possible (likely)

Inclusion of different systematics tend to prefer higher MET cut values

HLT Applied

Cut on MET [GeV]

R. Cavanaugh, SUSY/BSM Working Group Meeting

observations
Observations
  • Systematics in toy “significance” definition:
    • Shift to higher MET cut values preferred
    • Overall reduction in toy “significance” estimation
  • JetMET Uncertainties
    • Current choices dominate (no JetMET recommendation yet)
      • Jet Energy Scale: 10% ET
      • Jet Energy Resolution: additional one unit of ET smearing
  • Finite MC Statistics Uncertainty
    • Important, but does not currently dominate!!
      • Finite MC Statistics: NW / Ngen
  • QCD Level (not-shape) Uncertainty
    • Not important compared with others (but, prob. too optimistic)
      • QCD level: 50%

R. Cavanaugh, SUSY/BSM Working Group Meeting

conclusion
Conclusion
  • Everything still very preliminary!
    • Healthy discussion about Finite MC Statistics Systematic arising from 06 Sept. SUSY/BSM Meeting
  • Selection optimisation underway…
    • Toy “significance” estimate currently being used
      • Inclusion of systematic effects being studied
    • Likelihood ratio method being implemented
      • Will be used for final results
  • Early observations suggest that
    • Systematics can have a strong effect
    • JetMET systematics are important to understand and correctly estimate
      • Current assumptions may be conservative?
      • Need official recommendation from JetMET assuming 10 fb-1 data collected
  • We are still collecting additional statistics
    • Y. Pakhotin has produced trees for all available ttbar!
    • We are working to include more W+jets
    • Will include Alpgen samples when available

R. Cavanaugh, SUSY/BSM Working Group Meeting