1. September 13, 2005SUSY meeting Status of eμ low-p T trileptons Melisa Rossi Udine University

2. September 13, 2005SUSY meeting Outline Data and MC Lepton Selection Dilepton events □Dielectron □Dimuon □Electron-Muon Conclusions - Next

3. September 13, 2005SUSY meeting Data and MC Data □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 MC □Signal “Anadi Point” (Vadim) □DY sexo8t (Z  ll, Inv mass>5GeV/c 2 ) □ttbar (ttopel) □WW (wtop1w) □ZZ (Purdue)

4. September 13, 2005SUSY meeting Lepton Selection High p T (>20GeV/c) CEM and CMUP selection □Standard top/ewk definition 4-20GeV/c p T range □Muon ID as in CDF 7197 (Purdue) □Electron ID as high p T CEM ID Scale Factors CMUP ID Scale Factors SF E T CDF note 1.00 4-8GeV 7379 1.03 8-20GeV 7233 0.996 >20GeV 7309 SF E T CDF note 1.00 4-8GeV 7379 1.03 8-20GeV 7233 0.996 >20GeV 7309 SF P T CDF note 0.85 4-20GeV 7197 0.881 >20GeV 7309 SF P T CDF note 0.85 4-20GeV 7197 0.881 >20GeV 7309

5. September 13, 2005SUSY meeting Dilepton Control Regions CR1: Z window □76 ≤ M ee ≤ 106 GeV/c 2 CR2 : outside Z (diluted signal box) □MET>15 GeV □15 106 GeV/c 2

6. September 13, 2005SUSY meeting Electrons ID Χ 2 strip Problem CDF7309

7. September 13, 2005SUSY meeting CEM CEM -- CR1-- 224pb -1

8. September 13, 2005SUSY meeting CEM CEM -- CR2 -- 224pb -1

9. September 13, 2005SUSY meeting CEM CEM -- 224pb -1 DYWWZZttbarTOTDataSignal CR1 3353.5 ±13.2 0.90 ±0.08 0.40 ±0.013 0.5 ±0.03 3355.333850.1 CR2 118.3 ±2.5 3.1 ±0.15 0.1 ±0.008 2.2 ±0.06 126.51192.8

10. September 13, 2005SUSY meeting CEM CEM -- 224pb -1

11. September 13, 2005SUSY meeting CMUP CMUP-- CR1 -- 224pb -1 DYWWZZttbarTOTDataSignal CR1 727.9 ±7.06 0.2 ±0.04 0.10 ±0.008 0.1 ±0.016 728.37440.0

12. September 13, 2005SUSY meeting CEM CMUP -- CR2 -- 224pb -1 CEM 20 GeV & CMUP 8 GeV

13. September 13, 2005SUSY meeting CEM CMUP -- CR2 -- 224pb -1 CEM 8 GeV & CMUP 5 GeV OR CEM 5 GeV & CMUP 8 GeV

14. September 13, 2005SUSY meeting CEM CMUP -- CR2 – 224pb -1 DYWWZZttbarTOTDataSignal CR2 19.9 ±1.1 2.2 ±0.14 0.10 ±0.006 1.6 ±0.05 23.8250.4 DYWWZZttbarTOTDataSignal CR2 36.1 ±1.5 2.6 ±0.15 0.10 ±0.009 1.9 ±0.06 40.7520.6 CEM 20 GeV & CMUP 8 GeV CEM 8 GeV & CMUP 5 GeV OR CEM 5 GeV & CMUP 8 GeV

15. September 13, 2005SUSY meeting Conclusions ans Next CEM CEM □Fixed Χ 2 strip bug □Difference with John from 15% to 5% CMUP CMUP □reasonable Z  μ μ CEM CMUP □ (20,8) selection ~25 events □ (5,8) selection ~ 50 events Investigate discrepancies □High MET for cmup cmup □Low MET for cem cmup Add last MC samples Calculate fakes

16. September 13, 2005SUSY meeting CMUP CMUP 224pb -1