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CDF Searches for SUSY with Jets

CDF Searches for SUSY with Jets. Juan Valls. Rutgers University. For the CDF Collaboration. CERN, SUSY2K, June 2000. Outline. Selections and Backgrounds Interpretation of Results. Motivation, Signatures. MSSM MSUGRA GMSM. CDF Run I Detector. SVX’. CDF Jet Reconstruction.

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CDF Searches for SUSY with Jets

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  1. CDF Searches for SUSYwith Jets Juan Valls Rutgers University For the CDF Collaboration CERN, SUSY2K, June 2000

  2. Outline • Selections and Backgrounds • Interpretation of Results • Motivation, Signatures MSSM MSUGRA GMSM Juan Valls, SUSY2K

  3. CDF Run I Detector SVX’ Juan Valls, SUSY2K

  4. CDF Jet Reconstruction Calorimeters Tower Segmentation Seed Towers Preclusters Clusers Fixed Cone Algorithm • response relative to central region Absolute energy scale Jet Corrections Underlying event Out of cone Juan Valls, SUSY2K

  5. CDFET Definition VTX reconstructed vertices Primary Vertex Definition These analysis: High quality vertex Juan Valls, SUSY2K

  6. ET Trigger Sample: ~2.5M events ET-weighted EMF Out-of-time energy Event Charge fraction Out-of-time towers ET + jets Selection Second Selection (SEL2) First Selection (SEL1) Juan Valls, SUSY2K

  7. Estimated from MC ET + jets Backgrounds • Standard Model Sources • W + jets • Z + jets • tt, WW, WZ, ZZ • Instrumental, machine-related, and cosmic backgrounds Estimated from a control sample (high ET jet trigger, ET 50 GeV) Juan Valls, SUSY2K

  8. ET + jets Selection Final Cuts Lepton removal Lepton removal 24 events (Run 1A) 379 events Run 1B (stay tuned!) Juan Valls, SUSY2K

  9. (ET,jet) Cut  Spectrum (data vs backgrounds) Choice of  Cut Juan Valls, SUSY2K

  10. ET Distribution Final ET Spectrum For ET 200 GeV: Data: 5 Expected: 10.1  3.4 Juan Valls, SUSY2K

  11. ET Spectrum ET Distribution Phys. Rev. D56, 1357 (97) Juan Valls, SUSY2K

  12. ET + HF jets Selection Final Cuts (Pretag Sample) 396 events Juan Valls, SUSY2K

  13. Primary vertex IP 0 1 CDF b,c Tagging Jet Vertexing Tagger Efficiencies Jet Probability Juan Valls, SUSY2K

  14. JPB on ET + jets JPB Distribution (Pretag Sample) JPB Optimization min JPB for jets with  2 +IP tracks (PT>1 GeV/c2) min +JPB  5% (stop) B~97%, S~25% min +JPB  1% (sbotom) B~99%, S~45% Juan Valls, SUSY2K

  15. ET + HF jets Backgrounds Stop search Sbottom search Juan Valls, SUSY2K

  16. Nj, ET Distributions Tagged Samples Observed: 11 Expected:14.5 Observed: 5 Expected: 5.8 Juan Valls, SUSY2K

  17. BFMZ, Nucl. Phys. B526, 136 (1998) 19 observed 21.6  7.0 expected Juan Valls, SUSY2K

  18. DO Phys. Rev. D56, 1357 (97) Phys. Rev. Lett. 75, 618 (95) Phys. Rev. Lett. 38, 4937 (99) Juan Valls, SUSY2K

  19. Juan Valls, SUSY2K

  20. Multijet 4b Selection • Select four highest-ET jets Trigger • Leading ET jet selection • At least 3 b-tags among the four highest-ET jets in the event • (bb) and mass cuts Juan Valls, SUSY2K

  21. Multijet 4b Results Backgrounds QCD HF QCD fake triple tags Juan Valls, SUSY2K

  22. SUSY Higgs Limits Minimal Mixing Mixing Assumptions Maximal Mixing Juan Valls, SUSY2K

  23. CDF Run II Detector • Silicon detectors • Double SVX length for full acceptance • Double sided silicon for 3D tracking • More silicon layers (SVXII,ISL,L00) • Secondary vertex trigger (SVT) • Central tracker • Double number of stereo layers • X6 more sense wires (improves occupancy) • Muon system • Improved coverage |h|<1.5 • New Plug calorimeter • Add preshower and shower max detector + L00 LAYER Hybrids out of tracking area Beam pipe Microstrips Juan Valls, SUSY2K

  24. RUN II MSSM Higgs Prospects CDF Run I extrapolation >0,Amax,Ms=1 TeV DØ analysis Juan Valls, SUSY2K

  25. technicolor HSM Conclusions All Run I data compatible with SM expectations No evidence for SUSY Not covered here SUSY searches with leptons and photons final states (MSSM,MSUGRA,GMSB) Still to show: ET +  3 jets from CDF Run 1B (coming) • Tevatron Run II (2-15 fb-1, 2001-2005) • Sgluino mass reach ~ 400 GeV/c2 • Stop mass reach ~175 GeV/c2 • Clear shot for Higgs (Henry’s talk) • Increase MSUSY constrain energy range 100 GeV/c2 1 TeV/c2 • CDF II • Better MET, b-tagging, jet ET resolution,… Juan Valls, SUSY2K

  26. MI Commissioining Goals Achieved • 1st beam into MI (09/26/98) • 1st circulating beam into MI (10/10/98) • 1st accelerating beam into MI (150 GeV, 11/28/98) • 1st 8 GeV extracted beam (01/10/99) • 1st 150 GeV beam injected from MI to TeVatron (fixed target operation) (05/30/99) MI aims now towards operation On our way for SUSY ! 26 Juan Valls, SUSY2K

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