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Title:

First look at electron and jet distributions in W(?e ) jets and Z(?e e-) jets events

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W( e nu) jets and Z(e e-) jets will be important backgrounds ... Using the 10.0.1 Rome production W(ev) jets and Z(ee) jets AODs, produced using Jimmy ... – PowerPoint PPT presentation

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Title: First look at electron and jet distributions in W(?e ) jets and Z(?e e-) jets events


1
First look at electron and jet distributions in
W(?e )jets and Z(?ee-)jets events
UK e/gamma Meeting, July 2005
Graham Kilvington Royal Holloway, University of
London
1
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2
Motivation
  • W(? e nu) jets and Z(?ee-) jets will be
    important backgrounds to SUSY processes at the LHC

- missing ET, high pT jets and isolated leptons
  • From the TDR

Using the parton shower model
Key
Z(?ll) n jets
W(?l nu) n jets
ttbar
QCD
Meff (GeV)
2
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3
Motivation
  • However, using Matrix Element method of sample
    production suggests the background is larger than
    in TDR

Taken from S. Asai talk at Rome meeting
3
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4
Motivation
  • Develop techniques to analyse these backgrounds
    from data
  • Use Z(?ee) jets events to estimate the missing
    ET distribution for Z(?vv) events
  • Use cross section and branching ratios of Z(?ee)
    jets events to normalise W(?ev) jets estimate
  • Have a first look at the jet distributions of
    these events assumption is that they will be
    similar

- How true is this?
- Does the reconstruction introduce any effects?
4
5/7/5
5
Method
  • Using the 10.0.1 Rome production W(?ev) jets
    and Z(?ee) jets AODs, produced using Jimmy
  • Using the SUSYPhys analysis program
  • Cuts already in place in reconstruction code
  • Electron pT gt 10 GeV
  • Jet pT gt 10 GeV
  • Eta lt 2.5

4b
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6
Electron variables
  • W
  • Z

5
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7
Jet variables
  • Z
  • W

6
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8
N jets for different e- reco
  • W

Red Truth
Black Reco
7
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9
N jets for different e- reco
  • Z

Red Truth
Black Reco
8
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10
Individual jet pT
  • W

0 Reco e-
Highest pT jet
2nd highest pT jet
3rd highest pT jet
4th highest pT jet
5th highest pT jet
6th highest pT jet
9
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11
Individual jet pT
  • W

1 Reco e-
Highest pT jet
2nd highest pT jet
4th highest pT jet
3rd highest pT jet
5th highest pT jet
6th highest pT jet
10
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12
Individual jet pT
  • Z

0 Reco e-
Highest pT jet
2nd highest pT jet
4th highest pT jet
3rd highest pT jet
5th highest pT jet
6th highest pT jet
11
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13
Individual jet pT
  • Z

1 Reco e-
Highest pT jet
2nd highest pT jet
4th highest pT jet
3rd highest pT jet
5th highest pT jet
6th highest pT jet
12
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14
Individual jet pT
  • Z

2 Reco e-
Highest pT jet
2nd highest pT jet
4th highest pT jet
3rd highest pT jet
5th highest pT jet
6th highest pT jet
13
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15
Reco-Truth matching
  • W

14
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16
Reco-Truth matching
  • Z

15
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17
Plans from here
  • See how using different jet algorithms affects
    jet reconstruction and the results shown above
  • Develop techniques to estimate SUSY backgrounds
    from data samples

16
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