Status of e μ low-p T trilepton analysis

December 20, 2005 SUSY meeting 1

Status of eμ low-pT trilepton analysis

M.Rossi,G.Pauletta,M.Giordani

Udine University


Outline

Data and MCLepton SelectionControl Regions under investigationDilepton events

□ Dielectron □ Dimuon □ Electron-Muon

Conclusions


Data and MCData

□ SUSY dilepton dataset edil0d ■ Good run list v7 no silicon

▫ 224pb-1 up to February 2004

□ Dielectron events■ DIELECTRON_CENTRAL_4 trigger

□ Dimuon events■ DIMUON_CMUPCMUP4 trigger

□ Electron-Muon events■ CEM4_CMUP4 trigger


Data and MC

MC□ Signal point ~360fb-1

(m0=100,m1/2=180,A0=0,tanβ=5,μ>0)□ DY sexo9t (Z ll, Mll>5GeV/c2) ~5fb-1

□ ttbar (ttopel) ~170fb-1

□ WW (wtop1w) ~34fb-1

□ ZZ (multilepton) ~535fb-1

□ WZgamma (MadGraph) ~300-2500fb-1

□ bbbar (Giovanni) ~30pb-1


Lepton Selection

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

CEM ID Scale Factors

CMUP ID Scale Factors

SF ET CDF note 1.00 4-8GeV 7379 1.03 8-20GeV 7233 0.996 >20GeV 7309

SF ET CDF note 1.00 4-8GeV 7379 1.03 8-20GeV 7233 0.996 >20GeV 7309

SF PT CDF note 0.85 4-20GeV 7197

0.881 >20GeV 7309

SF PT CDF note 0.85 4-20GeV 7197

0.881 >20GeV 7309


ee selection (OS)1st lepton pT>10 GeV/c2nd lepton pT>5 Gev/c


ee selection Z window (OS)1st lepton pT>10 GeV/c2nd lepton pT>5 Gev/c

Z obs 3410 exp 3363


μμ selection (OS)1st lepton pT>10 GeV/c2nd lepton pT>5 Gev/c


μμ selection Z window (OS)1st lepton pT>10 GeV/c2nd lepton pT>5 Gev/c

Z obs 883 exp 878


Contron Regions a la Teruki

If TRILEPTON, SIGNAL REGION

Invariant Mass of electrons Mll

MET

15 76 106

10 15

nJets < 2

nJets > 1

G

H

I

J

A

A2

E

F

A

A2

G

H


eμ Control Regions

□ MET>15 GeV and nJET<2 (A+E)□ MET>15 GeV and nJET>1 (A2+F)□ MET<10 GeV and nJET<2 (G+I)□ MET<10 GeV and nJET>1 (H+J)

1st lepton pT>20 GeV/c2nd lepton pT>8 Gev/c


eμ selection



eμ MET>15 and nJET<2 (A+E)



eμ MET>15 and nJET>1 (A2+F)



eμ MET<10 and nJET<2 (G+I)



eμ (20,8) Control Regions

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

Signal 0.5206±0.0004 0.0168±0.0001 0.0356±0.0001 0.001±0.00002

Data 13 5 17 0

MCtot 13.86±0.16 3.17±0.05 11.6±0.2 0.18±0.02

DY 9.70±0.16 0.83±0.05 11.32±0.18 0.12±0.02

WW 3.151±0.011 0.167±0.003 0.174±0.003 0±0

WZ/γ* 0.4810±0.0002 0.011±0.00004 0.016±0.00002 0.0006±0.0000

ttbar 0.4224±0.0008 2.156±0.002 0.0070±0.0001 0.0532±0.0003

bbar 0±0 0±0 0±0 0±0

ZZ 0.1107±0.0001 0.010±0.00004 0.0464±0.0001 0.0034±0.00003


eμ selection



Conclusions

ee and μμ distributions better □ whole spectrum and Z window

eμ (20,8) shows some excess in data □ whole spectrum and Teruki control regions

eμ (10,5) missing something□ maybe fakes

Fakes calculation is our next step□ the machinary is there

Look at trilepton CR Up to ~320pb-1 (shutdown 2004)

□ using CEM4_CMU4 trigger path

Status of e μ low-p T trilepton analysis

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