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Tevatron Non-SUSY BSM: Searches for Physics Beyond the SM and MSSM David Stuart

Tevatron Non-SUSY BSM: Searches for Physics Beyond the SM and MSSM David Stuart University of California, Santa Barbara DIS 2007, Munich April 2007. Outline. There are two categories of searches:. Model driven New Dimensions, New Interactions, or New Particles Specifically optimized

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Tevatron Non-SUSY BSM: Searches for Physics Beyond the SM and MSSM David Stuart

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  1. Tevatron Non-SUSY BSM: Searches for Physics Beyond the SM and MSSM David Stuart University of California, Santa Barbara DIS 2007, Munich April 2007

  2. Outline There are two categories of searches: • Model driven • New Dimensions, New Interactions, or New Particles • Specifically optimized • Signature driven • Look for deviations from SM in specific final states • Broadly optimized Most recent results use ≈ 1 inverse femtobarn. David Stuart, DIS2007

  3. q e+ Z’ e- q New Gauge Boson: Z’ ee Model: Many unification models Signature: Di-electron mass peak • Backgrounds: • Drell-Yan (Irreducible & dominant) • QCD fakes • Diboson and top David Stuart, DIS2007

  4. q e+ Z’ e- q New Gauge Boson: Z’ ee Model: Many unification models Signature: Di-electron mass peak • Backgrounds: • Drell-Yan (Irreducible & dominant) • QCD fakes • Diboson and top David Stuart, DIS2007

  5. q e+ Z’ e- q New Gauge Boson: Z’ ee Model: Many unification models Signature: Di-electron mass peak • Backgrounds: • Drell-Yan (Irreducible & dominant) • QCD fakes • Diboson and top David Stuart, DIS2007

  6. q e+ W’ q  New Gauge Boson: W’ e Model: Many unification models Signature: High transverse mass peak • Backgrounds: • Tail of W • QCD (suppressed w/  cuts on • jets w/ ET>15) David Stuart, DIS2007

  7. q e+ W’ q  New Gauge Boson: W’ e Model: Many unification models Limits assume SM couplings Signature: High transverse mass peak • Backgrounds: • Tail of W • QCD (suppressed w/  cuts on • jets w/ ET>15) David Stuart, DIS2007

  8. G RS Extra Dimensions: G γγ Model: Strongly coupled graviton in Randall-Sundrum warped extra dimension Signature: Di-photon mass peak • Backgrounds: • QCD jets faking photons • SM di-photon production • (dominant at high mass) David Stuart, DIS2007

  9. G RS Extra Dimensions: G γγ Model: Strongly coupled graviton in Randall-Sundrum warped extra dimension Signature: Di-photon mass peak • Backgrounds: • QCD jets faking photons • SM di-photon production • (dominant at high mass) • Limits: • Comparable to di-leptons • Mass limits to 850 GeV • when  and ee combined David Stuart, DIS2007

  10. RS Extra Dimensions: G γγ or ee A similar search at D0 combines ee and  at the analysis stage as di-EM. David Stuart, DIS2007

  11. e G e e e ~3 GeV RS Extra Dimensions: G ZZ eeee Model: Strongly coupled graviton in Randall-Sundrum warped extra dimension Signature: Four electron mass peak Signal region: 2 < 50 and M > 500 Select Zee with a 2. • Backgrounds: • Very low backgrounds (0.02 ± 0.02 events) • so use very loose electron selection. David Stuart, DIS2007

  12. KK 3914 39830 19230 15713 Large Extra Dimensions: Monojet + Missing ET Model: ADD large extra dimensions Signature: 1 or 2 jets + MET Backgrounds: David Stuart, DIS2007

  13. 3914 39830 19230 15713 Large Extra Dimensions: Monojet + Missing ET Model: ADD large extra dimensions Signature: 1 or 2 jets + MET Backgrounds: No shape difference, so predicted from data. David Stuart, DIS2007

  14. 3914 39830 19230 15713 Large Extra Dimensions: Monojet + Missing ET Model: ADD large extra dimensions Signature: 1 or 2 jets + MET Backgrounds: David Stuart, DIS2007

  15. e e e Excited electron: e* e Model: Compositeness Signature: e mass peak Backgrounds: DY+ Zee with brem David Stuart, DIS2007

  16. Excited electron: e* e Model: Compositeness Signature: e mass peak Backgrounds: DY+ Zee with brem David Stuart, DIS2007

  17. 2nd generation Leptoquark: Model: LQ carries both color and lepton # • Signature: •  + 2 jets + MET • j mass peak • Backgrounds: • W+jets & top David Stuart, DIS2007

  18. 2nd generation Leptoquark: Model: LQ carries both color and lepton # • Signature: •  + 2 jets + MET • j mass peak • Backgrounds: • W+jets & top David Stuart, DIS2007

  19. 4th generation quark: b’ bZ Model: 4th gen quark w/ small couplings to 1st three generations. • Signature: Z+ jets • At least 3 jets, ET>30 GeV • Large total jet energy, JT • Background: Z+ jets • Predicted from the data • by fitting ET spectrum • and modeling JT David Stuart, DIS2007

  20. 4th generation quark: b’ bZ Model: 4th gen quark w/ small couplings to 1st three generations. • Signature: Z+ jets • At least 3 jets, ET>30 GeV • Large total jet energy, JT • Background: Z+ jets • Predicted from the data • by fitting ET spectrum • and modeling JT David Stuart, DIS2007

  21. 4th generation quark: b’ bZ Model: 4th gen quark w/ small couplings to 1st three generations. • Signature: Z+ jets • At least 3 jets, ET>30 GeV • Large total jet energy, JT • Background: Z+ jets • Predicted from the data • by fitting ET spectrum • and modeling JT David Stuart, DIS2007

  22. 4th generation quark: b’ bZ Model: 4th gen quark w/ small couplings to 1st three generations. • Signature: Z+ jets • At least 3 jets, ET>30 GeV • Large total jet energy, JT • Background: Z+ jets • Predicted from the data • by fitting ET spectrum • and modeling JT Data consistent with prediction, limits obtained at 0.5 pb and 270 GeV. David Stuart, DIS2007

  23. 4th generation quark: b’ bZ Model: 4th gen quark w/ small couplings to 1st three generations. • Signature: Z+ jets • At least 3 jets, ET>30 GeV • Large total jet energy, JT • Background: Z+ jets • Predicted from the data • by fitting ET spectrum • and modeling JT W+jets Control Sample Top in W+jets is used as a cross-check of the MC-less method David Stuart, DIS2007

  24. Model Independent Searches Making a search model-specific increases its sensitivity at the cost of breadth. Making a search less specific increases its breadth at the cost of sensitivity. There are several model-independent search results from the Tevatron… David Stuart, DIS2007

  25. Search for high pT Z • Background: Z+ jets • QCD from same-sign data • Others predicted with MC David Stuart, DIS2007

  26. Search for high pT Z • Background: Z+ jets • QCD from same-sign data • Others predicted with MC David Stuart, DIS2007

  27. Search for Z + X David Stuart, DIS2007

  28. Search Region Search for Dilepton + X where X =γ, HT, MET, high ET jets, b-jets, leptons Background:Z+jets, Z+, Diboson, top, QCD “Unusual” dileptons + 2j + HT>400 Highest HT event looks top-like, with a b-tag and 3 jets. David Stuart, DIS2007

  29. Search for  + X, where X = e///MET • Partially motivated by Run I ee+γγ+MET candidate event David Stuart, DIS2007

  30. Search for Stable CHArged Massive Particles(CHAMPs) If heavy, a CHAMP would penetrate like a muon, but it would be slow. D0 searched with muon chamber scintillator timing, and CDF searched with its TOF counters. Limits on A of 10 fb if weakly interacting and 48 fb if strongly interacting. David Stuart, DIS2007

  31. Summary • CDF and D0 have varied searches, both model specific • and model independent. • Some fluctuations seen, as one would expect in a • large ensemble of measurements. David Stuart, DIS2007

  32. Summary • CDF and D0 have varied searches, both model specific • and model independent. • Some fluctuations seen, as one would expect in a • large ensemble of measurements. • The Standard Model wins again. David Stuart, DIS2007

  33. Summary • CDF and D0 have varied searches, both model specific • and model independent. • Some fluctuations seen, as one would expect in a • large ensemble of measurements. • The Standard Model wins again. • But, we are not done hammering away at it: • The Tevatron expts will collect about 4x more data. David Stuart, DIS2007

  34. Summary • CDF and D0 have varied searches, both model specific • and model independent. • Some fluctuations seen, as one would expect in a • large ensemble of measurements. • The Standard Model wins again. • But, we are not done hammering away at it: • The Tevatron expts will collect about 4x more data. • There is a Larger Hammer Coming. David Stuart, DIS2007

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