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Electroweak Physics with CDF

Explore Electroweak Physics with CDF Collaboration at EPS 2003, covering Tevatron upgrades, precision measurements, and Boson signatures with detailed analyses and future perspectives.

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Electroweak Physics with CDF

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  1. Electroweak Physics with CDF Antonio Sidoti University of Pisa and INFN For the CDF Collaboration EPS - Aachen 18 July 2003 • Outline: • The Tevatron and CDF Upgrade • Ewk Physics: • Baseline Measurements (W/Z) • Precision Measurements • Perspectives Aachen EPS03

  2. Tevatron Booster Recycler CDF DØ Main Injector Fermilab Tevatron Upgrade (RunII) s RunI = 1.8 TeV Now s RunII = 1.96 TeV • New Main Injector: • Improve p-bar production • Recycler ring: • Reuse p-bars Not used yet! Aachen EPS03

  3. Tevatron Performances • Lum at RunI: 110 pb-1 • 2003 Goals: • ~200 pb-1 for Fall • 10 pb -1/week by the end of the year • Achieved • ~9.2 pb-1 best week RunII Integrated Luminosity (pb-1) Weekly Integrated Luminosity (pb-1) 5.1031 3.1031 Peak Luminosity Used for today’s measurements 1.1031 Aachen EPS03

  4. CDF RunII Detector • From RunI: • Solenoid • Muon system • Central Calorimeter Polar angle q • For RunII: • Front-end DAQ • Trigger • Track (L1) and Displaced Track (L2) • New Silicon Tracker (8 Layers) (|h|<2) • Central Outer Tracker • TOF • Plug Calorimeters • Extended Muon Coverage Electron Id up to |h|~2.8 Muon Id up to |h|~1.5 Aachen EPS03

  5. Electroweak Physics at CDF: RoadMap W/Z Cross section (e,m,t,n). Central, Forward Regions Standard High PTProbes: Check Efficiencies, Backgrounds… Beyond SM Precision Electroweak Measurements at ~2TeV AFB Z Asymmetry G(W)Width • Z’ Resonances • New Interactions • Di-Boson Couplings W Asymmetry DiBoson Cross Section Universality W Mass SM Higgs Mass Constraint Aachen EPS03

  6. Neutrinos: Large Missing Energy Only Transverse (ET or Met) Boson Signatures at CDF Electron: EM Calorimeters High Pt (Track) Isolated Muons: Muon Detectors High PT Isolated Z Signature: Two Isolated Leptons (diff charge) W Signature: Isolated Lepton and ET Aachen EPS03

  7. Events Back. •B(W-->ll) (nb) 6% 2.64±0.01stat±0.09sys±0.16lum e 38625  11% 2.64±0.02stat±0.12sys±0.16lum 21599 W Cross Sections(e,m) Electron-Channel • Clean Signature • High ET • Isolated lepton • Missing ET • High & S/B Muon-Channel Aachen EPS03

  8. W Cross Sections (t) th = narrow isol. jet + low trk mult. (1 or 3) + M(vis)<Mt Hadronic tau decays Lepton Universality s.BF(W->tn)=2.620.07(stat) 0.21(syst) 0.16(lum)nb Aachen EPS03

  9. Clean Signature • Two High ET Isolated lepton • Opposite Charge • High & S/B Events Back. •B(Z-->ll) (pb) 267±6stat±15sys±16lum 1830 0.6% e  1631 0.9% 246±6stat±12sys±15lum Z Cross Sections(e,m) Muon Channel Electron Channel Aachen EPS03

  10. Z Cross Section (t) Triggering on t from hadronic decay Clear Z ehsignal Can be our calibration sample Work in Progress for Cross Section Measurement Aachen EPS03

  11. W Cross Section Measurements Z Cross Section Measurements s(ppW tn) s(ppW mn) s(ppW en) s(ppZ mm) s(ppZ ee) combined sW  B(W l)= 2.640 ±0.012stat ±0.093syst ±0.158lum nb combinedsZ B(Z ll)= 251.5 ±4.3stat ±10.6syst ±15.1lum pb s(pp->W)Th@1.96 TeV=2.731 0.002(Th) nb(NNLO), Stirling et al, Phys Lett B531, (2002) Aachen EPS03 s(pp->Z)Th@1.96 TeV=252.1 8.8(Th) pb(NNLO)

  12. From R to G(W) s.BF(W->lvl) R= s.BF(Z->ll) s(pp->W) G(Z) G(W->lnl) R= s(pp->Z) G(Z->ll) G(W) CDF (e): 9.880.24(stat)0.44(syst) CDF(m):10.690.28(stat)0.31(syst) CDF(e+m):10.690.28(stat)0.31(syst) CDF G(W) Measurement • Larger systematic uncertainties: • Detector Simulation (e) • Background Estimates(e-m) • Lepton ID (e-m) G(W)CDF=2146 78 MeV G(W)SM=2092.1 2.5 MeV Aachen EPS03

  13. Extending geometric acceptance of Leptons. • Looking in the Forward regions (High |h|). • Towards Cross Section Measurements: • Establishing Baseline Selection • Trigger and ID efficiencies • Background Studies Extending Detector Acceptance Muon Channel(~0.6<|h|<1.0) i.e. “How to increase sample without increasing Luminosity” Aachen EPS03

  14. Electron Channel 1.1<|h|<2.8 Combining Plug Calorimetry and Forward Tracking Z Boson W Boson Aachen EPS03

  15. Sensitivity to u/d fraction in proton • Constraints on PDF • Smaller Uncertainty from PDF • in highPT EWK and Top Physics Towards W Charge Asymmetry PDF Sensitivity • Charge ID and high |h| coverage Work in Progress Aachen EPS03

  16. Z Forward Backward Asymmetry SM Contributions Beyond SM(Z’,New Interactions) • Probing (Unique at Tevatron): • Z/g* Interference in High Invariant Mass Region (far from Z-pole) Consistent with SM Aachen EPS03

  17. e + m Process: pp->Wg->lnlg Events Back •B(Wl) (pb) e 43 33% 17.2±3.8stat±2.8sys±1.0lum e + m  29% 19.8±4.5stat±2.4sys±1.2lum 38 SM @s=1.96TeV 18.7 ± 1.3 DiBoson Production:Wg • DiBoson Coupling Measurements: • Probe ewk boson self-coupling • Sensitivity to physics BSM(Anomalous Couplings) • Statistically Limited • One High-PT lepton(e,m) • One Photon(DR(g,l)>0.7) • Large Missing ET Aachen EPS03 Consistent with SM

  18. Process: pp->Zg->llg Events Back. •B(Z-->ll) (pb) e 11 4.6% 5.5±1.7stat±0.6sys±0.3lum  14 4.0% 6.0±1.6stat±0.7sys±0.4lum DiBoson Production:Zg • Two High-PT Leptons(Opposite sign) • One Photon (DR(l,g) >0.7) •B(Z-->ll)SM= 5.4 ± 0.4pb Consistent with SM Aachen EPS03

  19. pp->WW->ll’nn’ (l=e,m) Statistics Limited Step for SM Higgs Searches Diboson Cross Sections: WW • Selection: • Two High-Pt Isolated Central Leptons(Opposite Charge) • Large Missing ET • Veto Z production and Jets Bkg 1.530.64 WW->Dil 2.790.62 2 Events observed Main Backgrounds: DY, tt,WZ,Fakes Aachen EPS03

  20. Baseline Electroweak Measurements Re-established • Electroweak Precision Measurement Program • Exploiting larger detector acceptance • Work in progress on dataset with the largest (beyond RunI ) integrated luminosity datasets Consistent with SM Conclusions Aachen EPS03

  21. Backup Tevatron Lum at RunI ~110 pb-1 s RunI = 1.8 TeV Now s RunII = 1.96 TeV Aachen EPS03

  22. =1 =2 =3 CDF Detector Aachen EPS03

  23. Aachen EPS03

  24. a: selection criteria for pp coll. ma: #int/Bunch Crossing (BC) fBC: BC Frequency spp: pp inelastic cross section :Efficiency of CLC “0” hits #hits #part Luminosity Measurement at CDF • Luminosity (L) from CLC (Cherenkov Luminosity Counters): • Discriminating primary (from ppbar)-secondary particles • Time resolution Well adapted for high-L collider Increasing Lum. Uncertainty manly from: ea= MC simulation. spp = 60.41.4 mb (measured by CDF) mclc: Different definitions Systematic uncertainty ~5% Aachen EPS03

  25. th tl Triggering on Taus (hadronic) pTseed> 5 GeV/c Tau Cone Isolation Cone Z pTl > 8 GeV/c ee, e, , eh, h Aachen EPS03

  26. Aachen EPS03

  27. Aachen EPS03

  28. Backup AFB Aachen EPS03

  29. DiBoson(Wg,Zg) Wgamma Z gamma Non SM! Aachen EPS03

  30. DiBoson(Wg) Aachen EPS03

  31. DiBoson:Wgamma Wg->eneg Wg->mnmg Aachen EPS03

  32. WW DiBoson Df~0 Events compatible with tt dilepton Aachen EPS03

  33. Run II with 2 fb-1 will provide a chance to: • Measure Mw to ±40 MeV/c2 • Measure Mtop to ±3 GeV/c2 DØ / CDF Run 2a Goal Constraints on SM Higgs Mass W Mass(Perspectives for RunII) Aachen EPS03

  34. s.BF(W->lvl) R= s.BF(Z->ll) CDF (e): 9.880.24(stat)0.44(syst) CDF(m):10.690.28(stat)0.31(syst) D(e) :10.340.35(stat)0.39(syst) TeV :10.370.16(stat)0.28(syst) From R Tevatron Combined Measurement… First RunII Tevatron Combined (D0+CDF) Measurement • From Tevatron Combined R: • D (e channel) • CDF (e,m channel) Extract Larger systematic uncertainties dominated: Detector Simulation (CDF e) Background Estimates(CDF/D e) Lepton ID (all channels) Aachen EPS03

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