# Presentation: 492207

## High pt  channel

- Outline
- ID for tight muons
- ID for loose muon and electron
- Analysis cuts
- Sensitivity for 500 pb-1
- Timeline

- 8/01/04

## ID Cuts for tight central muons

|  | High pt | Low pt |
| --- | --- | --- |
| Stub info | XCMU < 3 | XCMU < 3 || Chi2<9 |
|  | XCMP < 5 | XCMP < 5 || Chi2<9 |
|  | XCMx < 6 | XCMX < 6 || Chi2<9 |
| COT Track | BcPt>20 | BcPt>4 |
|  | AxSeg(5)>2 | AxSeg(5)>2 |
|  | StSeg(5)>1 | StSeg(5)>1 |
|  | Chi2Cot/NHits-5 < 4 | Chi2Cot/NHits-5 < 4 |
|  | Z0<60 | Z0<60 |
| Isolation | Cal Iso/pt<0.1 | Cal Iso/pt<0.1 |
| Energy | EmE< 2 + max(0,(pt-100)*0.0115)  | EmE< 2  |
|  | HadE < 6 + max(0,(pt-100)*0.028) | HadE<3.5+8/pt |
|  | Total E > 0.1 | Total E > 0.1 |

- 8/01/04

## ID Cuts for loose muon and loose electron

| Muon | Stubless | AxSeg(5)>2 |
| --- | --- | --- |
|  | Pt > 10 GeV | StSeg(5)>1 |
|  | EmE< 2  | HadE<3.5+8/pt |
|  | Iso/pt <0.1 | d0 < 0.2 |
| Electron | Et > 4 && pt > 4 GeV |  |
|  | HadE<(0.055 + 0.0045*EmE) |  |
|  | Iso/Et < 0.1 |  |
|  |  |  |
| Track | Pt > 10 GeV
Iso/pt<0.1
AxSeg(5)>2 |  |

- Peter’s suggestions

- 8/01/04

## Isolation of the third objectin the SUSY MC

-  Track accepted if not resonance with the 2 selected muons
-  3rd Electron accepted if no electron resonances in the event
-  3rd Muon accepted if not resonance with the 2 selected muons and no other resonances in the event

- Tighten iso cut on the track to increase acceptance in place of third obj=e or  ?

- 8/01/04

## Analysis cuts: new approach

- Ask for the third object as frist step and optimize the cuts on the trilepton selected events
- One high pt and one loose pt muon (Di event)
- Third object: one loose muon OR one loose electron*
- Jet requirement
- Invariant mass requirement
- Significance requirement
- Met requirement
- * Check third object as track

- 8/01/04

## Third object

|  | susy | Z | Z | t-tbar | WW | WZ |
| --- | --- | --- | --- | --- | --- | --- |
| Di | 7.18 | 5935 | 56 | 5.32 | 8.98 | 2.65 |
| & track | 2.84 | 224 | 2.15 | 2.27 | 0.39 | 0.95 |

|  | susy | Z | Z | t-tbar | WW | WZ |
| --- | --- | --- | --- | --- | --- | --- |
| Di | 7.18 | 5935 | 56 | 5.32 | 8.98 | 2.65 |
| & (e or ) | 1.34 | 15 | 0.13 | 0.096 | 0 | 0.52 |

- S=2.84; B=230; S/√B=0.19

- S=1.34; B=16; S/√B=0.33

- 8/01/04

## Jet content (I)

- Jet Energy is corrected at L5
- (“absolute”)
- Accept event if:
- nJet=0 or Leading Jet Et < 30 GeV (a)
- nJet(Et>20GeV) <2 && nJet(Et>80GeV)=0 (b)

- Uncorrected
- Corrected at L4
- Corrected at L5

- Susy
- t-tbar

- Susy

- 8/01/04

## Jet Content (II)

|  | susy | Z | Z | t-tbar | WW | WZ |
| --- | --- | --- | --- | --- | --- | --- |
| e or  | 1.34 | 15 | 0.13 | 0.096 | 0 | 0.52 |
| & (a) | 1.16 | 13.96 | 0.13 | 0 | 0 | 0.42 |

|  | susy | Z | Z | t-tbar | WW | WZ |
| --- | --- | --- | --- | --- | --- | --- |
| e or  | 1.34 | 15 | 0.13 | 0.096 | 0 | 0.52 |
| & (b) | 1.31 | 14.52 | 0.13 | 8.7E-3 | 0 | 0.50 |

- S=1.16 ; B=14.51; S/√B=0.30

- S=1.31 ; B=15.16; S/√B=0.34

- 8/01/04

## Invariant mass

-  Remove resonances to be “point” independent
-  Reject events if OS M in [2.9;3.2] - [9.1;11] - [76,106] GeV

|  | susy | Z | Z | t-tbar | WW | WZ |
| --- | --- | --- | --- | --- | --- | --- |
| Jet constr. | 1.31 | 14.52 | 0.13 | 8.7E-3 | 0 | 0.50 |
| M | 1.28 | 6.98 | 0.13 | 8.7E-3 | 0 | 0.084 |

- S=1.28 ; B=7.2 ; S/√B=0.48

- 8/01/04

## Missing energy 

- Missing Energy is corrected for muons and jets
- Good agreement between Met at generator level and corrected Met in all samples BUT Z

- 8/01/04

## Significance (I)

- Better discrimation between DY and signal
- Less energy scale dependence

- Met and Sumet corrected for muons and jets

- 8/01/04

## Significance (II)

|  | susy | Z | Z | t-tbar | WW | WZ |
| --- | --- | --- | --- | --- | --- | --- |
| M | 1.28 | 6.98 | 0.13 | 8.7E-3 | 0 | 0.084 |
| Sign > 2 | 1.00 | 0 | 0 | 4.4E-3 | 0 | 0.064 |

- S=1.0 ; B =0.068 ; S/√B=3.83

- Susy

- Z

- 8/01/04

## Missing Energy 

- Cut needed just to define the control region --- not useful for S/√B maximization ?
- Final cut on Met

|  | susy | Z | Z | t-tbar | WW | WZ |
| --- | --- | --- | --- | --- | --- | --- |
| Sign > 2 | 1.0 | 0 | 0 | 4.4E-3 | 0 | 0.064 |
| Met > 10 | 1.0 | 0 | 0 | 4.4E-3 | 0 | 0.064 |

- S=1.0 ; B = 0.0047; S/√B = 4.6

- 8/01/04

## Summary of proposed cuts

|  | susy | D0 pt | Z | Z | t-tbar | WW | WZ | ZZ |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Di | 7.18 | 16.20 | 5935 | 56 | 5.32 | 8.98 | 2.65 | 0.69 |
| 3rd | 1.34 | 2.51 | 15 | 0.13 | 0.096 | 0 | 0.52 | 0.016 |
| Jet | 1.31 | 2.45 | 14.52 | 0.13 | 8.7E-3 | 0 | 0.50 | 0.015 |
| Mass | 1.28 | 2.35 | 6.98 | 0.13 | 8.7E-3 | 0 | 0.084 | 0.006 |
| Sign | 1.00 | 2.00 | 0 | 0 | 4.4E-3 | 0 | 0.064 | 1.4E-3 |
| Met | 1.00 | 2.00 | 0 | 0 | 4.4E-3 | 0 | 0.064 | 1.4E-3 |

- S=1.0 ; B = 0.069; S/√B = 3.81

- D0 point: S=2.0 ; B = 0.069; S/√B = 7.62

- 8/01/04

## Summary of D0 cuts

|  | susy | D0 pt | Z | Z | t-tbar | WW | WZ | ZZ |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Di | 7.18 | 16.20 | 5935 | 56 | 5.32 | 8.98 | 2.65 | 0.69 |
| Mass | 6.03 | 12.36 | 57 | 33.72 | 1.88 | 4.00 | 0.87 | 0.016 |
| Met  | 6.02 | 12.35 | 56 | 32.91 | 1.88 | 3.97 | 0.87 | 0.016 |
|  | 5.37 | 11.18 | 40 | 5.24 | 1.78 | 3.57 | 0.74 | 0.013 |
| Jet | 4.75 | 10.22 | 36 | 4.57 | 0.37 | 3.40 | 0.70 | 0.012 |
| 3rd | 0.97 | 1.61 | 0.28 | 0 | 4.3E-3 | 0 | 0.043 | 1.6E-3 |

- Mass in [15;60] GeV; Met > 15 GeV; <160; no jets wit Et> 50 GeV

- S=0.97; B=0.33; S/√B=1.69

- D0 point: S=1.61; B = 0.33; S/√B = 2.8

- 8/01/04

## Timeline

- Cross check with Liverpool --- done
- Selection of third object --- done
- Selection ok kinematic cuts --- done
- _Goal _is to have the sensitivity study for Dec 2nd
- _To do_,
- Include fake rate – up to Nov. 20th --- Martin released code
- Low Met control region – up to Nov. 27th

- 8/01/04

## Met in tt sample

- 8/01/04