February 21, 2006 SUSY meeting 1

Status of eμ low-pT trilepton analysis

M.Rossi,G.Pauletta,M.Giordani

Udine University

February 21, 2006 SUSY meeting 2

Data and MC Data

□ SUSY dilepton dataset edil0d ■ Good run list v7 no silicon (224pb-1), CEM4_CMUP4 trigger

MC□ Signal point (m0=100,m1/2=180,A0=0,tanβ=5,μ>0) ~360fb-1

□ DY sexo9t (Z ll, Mll>5GeV/c2) ~5fb-1

□ ttbar (ttopel) ~170fb-1

□ WW (wtop1w) ~34fb-1

□ ZZ (Oscar) ~535fb-1

□ WZ (Madgraph) ~430fb-1

□ bbbar (Giovanni) ~57pb-1

Fakes □ using CEM8 and CMUP8 inclusive samples□ Lepton+fake selection requiring events with

■ real first lepton (CEM8 for eμ and CMUP8 for μe)■ fake lepton using Liverpool method

February 21, 2006 SUSY meeting 3

Event Selection

Events with 1 electron and 1 muon □ Leading lepton pT>10 GeV/c

□ Next-to-leading lepton pT>5 GeV/c

High pT (>20GeV/c) CEM and CMUP selection□ Standard top/ewk definition

4-20GeV/c pT range □ Muon ID as in CDF 7197 (Purdue)

□ Electron ID as high pT

February 21, 2006 SUSY meeting 4

Last time Meμ

OS

SS

MET

February 21, 2006 SUSY meeting 5

Since last time

Code□ Fixed bug in dilepton fake estimation□ Fixed bug in bbbar sample

MC□ WZ NEW inclusive sample ~430fb-1

□ bbbar (Giovanni) ~57pb-1 (last time 30 pb-1)

February 21, 2006 SUSY meeting 6

eμ Control Regions

□ A+E• MET>15 GeV • nJET<2

□ A2+F• MET>15 GeV • nJET>1

□ G+I• MET<10 GeV • nJET<2

□ H+J• MET<10 GeV • nJET>1

If TRILEPTON, SIGNAL REGION

Invariant Mass of Mll

MET

15 76 106

10

15

nJets <2

nJets >1

G

H

I

J

A

A2

E

F

A

A2

G

H

February 21, 2006 SUSY meeting 7

eμ events

OS

Meμ MET

SS

February 21, 2006 SUSY meeting 8

eμ Control Regions

Meμ

OS

□ A+E• MET>15 GeV • nJET<2

□ A2+F• MET>15 GeV • nJET>1

□ G+I• MET<10 GeV • nJET<2

Meμ Meμ

February 21, 2006 SUSY meeting 9

eμ Control Regions

A+E A2+F G+I H+J

Signal 0.813 ± 0.001 0.0155±0.0001 0.051±0.0001 0.001±0.00002

Data 37 5 180 0

MCtot 28.9±0.2 3.61±0.05 112.6±28.8 0.27±0.01

DY 20.7±0.2 0.87±0.05 27.46±0.27 0.08±0.01

WW 3.79±0.01 0.152±0.003 0.22±0.003 0±0

WZ/γ* 0.669±0.001 0.0107±0.0001 0.023±0.0001 0.001±0.00002

ttbar 0.651±0.001 2.274±0.002 0.008±0.0001 0.053±0.0003

bbar 0±0 0±0 54.01±28.75 0±0

ZZ 0.1569±0.0001 0.007±0.00004 0.076±0.0001 0.002±0.00002

fakes 2.9 0.3 30.8 0.16

February 21, 2006 SUSY meeting 10

μe events

OS

Mμe MET

SS

February 21, 2006 SUSY meeting 11

μe Control Regions

OS

□ A+E• MET>15 GeV • nJET<2

□ A2+F• MET>15 GeV • nJET>1

□ G+I• MET<10 GeV • nJET<2

Mμe Mμe Mμe

February 21, 2006 SUSY meeting 12

μe Control Regions

A+E A2+F G+I H+J

Signal 0.812 ± 0.001 0.0145±0.0001 0.051±0.0001 0.0004±0.00003

Data 36 5 142 0

MCtot 29.87±6.18 3.27±0.05 84.19±29.5 0.097±0.01

DY 22.8±0.2 0.82±0.05 27.00±0.27 0.04±0.01

WW 3.82±0.01 0.162±0.003 0.22±0.003 0±0

WZ/γ* 0.65±0.0004 0.008±0.00005 0.023±0.0001 0.001±0.00002

ttbar 0.65±0.001 2.28±0.002 0.008±0.0001 0.054±0.0003

bbar 2.49±6.17 0±0 56.87±29.5 0±0

ZZ 0.166±0.0002 0.007±0.00004 0.065±0.0001 0.002±0.00002

fakes 0 0 0 0

February 21, 2006 SUSY meeting 13

Conclusions

Much more confident in lepton+fake estimation

bbbar □ need a lot more□ will double the statistics by next week

Dilepton CRs need some more work but look much more reasonable than last time

Will look at trilepton CR and 320 pb-1

February 21, 2006 SUSY meeting 14

Lepton+fake Calculation

Using CEM8 and CMUP8 inclusive samples Lepton+fake selection requiring events with

□ real first lepton■ CEM8 for eμ and CMUP8 for μe

□ fake lepton using Liverpool method Should rescale for the trigger efficiency (εCEM4/ε CEM8) but

□ Don’t have the numbers handy□ Neglecting it as a first estimate should be fine

■ εCEM4 = 0.956, εCEM18 = 0.966■ εCMUP4 = 0.92, εCMUP18 = 0.90

Rescale for the considered integrated luminosity

February 21, 2006 SUSY meeting 15

μe (10,5) OLD

OS

SS

Mμe MET