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David Stuart, UCSB. PHENO’04 Searches for new physics at the Tevatron David Stuart, UC Santa Barbara for the CDF & D0 collaborations PHENO’04, April 26,

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Presentation on theme: "David Stuart, UCSB. PHENO’04 Searches for new physics at the Tevatron David Stuart, UC Santa Barbara for the CDF & D0 collaborations PHENO’04, April 26,"— Presentation transcript:

1 David Stuart, UCSB. PHENO’04 Searches for new physics at the Tevatron David Stuart, UC Santa Barbara for the CDF & D0 collaborations PHENO’04, April 26, 2004

2 David Stuart, UCSB. PHENO’04 (massabetized to avoid any indication of bias) New physics has the same ingredients as bread & butter physics Photons, MET, leptons, jets, b’s The experimental challenge is in defining and understanding the ingredients CDF & D0 have done that as evidenced by the SM measurements Combine the ingredients (with some reference to cookbook) for something new. Similar Combinations:  Z or Z’ E T jets  top or LQ or SUSY or Higgs

3 David Stuart, UCSB. PHENO’04 New physics has the same ingredients as bread & butter physics Photons, MET, leptons, jets, b’s

4 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

5 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

6 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

7 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

8 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

9 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

10 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

11 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

12 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

13 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

14 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

15 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons

16 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons CDF and D0 obtain Z’  Br limits of  50 fb  M>750 GeV (with SM couplings)

17 David Stuart, UCSB. PHENO’04 Search for high mass di-leptons See talk by M.Karagoz Unel Tuesday at 3pm.

18 David Stuart, UCSB. PHENO’04 Search for high mass e + e - and 

19 David Stuart, UCSB. PHENO’04 Search for high mass e + e - and 

20 David Stuart, UCSB. PHENO’04 Search for high mass e + e - and  = f SM + f KK  2 + f int  f = f(M,cos  *)  = ± M4SM4S 2 M s > 1.22 TeV (+) M s > 1.10 TeV (-)

21 David Stuart, UCSB. PHENO’04 Excited electron search (ee  )

22 David Stuart, UCSB. PHENO’04 Excited electron search (ee  ) See talk by H.Gerberich Tuesday at 6pm.

23 David Stuart, UCSB. PHENO’04 Excited electron search (ee  ) See talk by H.Gerberich Tuesday at 6pm. Expect 3 ± 0.4 Observe 3

24 David Stuart, UCSB. PHENO’04 Excited electron search (ee  ) See talk by H.Gerberich Tuesday at 6pm.

25 David Stuart, UCSB. PHENO’04 Leptoquark Searches (eejj)

26 David Stuart, UCSB. PHENO’04 Leptoquark Searches (eejj) Require Scalar Sum of eejj E T > 450 GeV  Br 238 GeV/c 2 if Br(LQ  eq)=1

27 David Stuart, UCSB. PHENO’04 Leptoquark Searches (e jj)

28 David Stuart, UCSB. PHENO’04 Leptoquark Searches

29 David Stuart, UCSB. PHENO’04 Leptoquark Searches Low   Jets + MET mode

30 David Stuart, UCSB. PHENO’04 Jets+MET is a classic signature of

31 David Stuart, UCSB. PHENO’04 Jets+MET is a classic signature of Large extra dimensions

32 David Stuart, UCSB. PHENO’04 Jets+MET is a classic signature of Large extra dimensions

33 David Stuart, UCSB. PHENO’04 Jets+MET is a classic signature of Large extra dimensions KK

34 David Stuart, UCSB. PHENO’04 Jets+MET is a classic signature of Supersymmetry

35 David Stuart, UCSB. PHENO’04 Jets+MET is a classic signature of Supersymmetry

36 David Stuart, UCSB. PHENO’04 Jets+MET is a classic signature of Quantum Chromodynamics

37 David Stuart, UCSB. PHENO’04 Jets+MET is a classic signature of Quantum Chromodynamics

38 David Stuart, UCSB. PHENO’04 Jets+MET is a classic signature of QCD or beam splash or cosmics

39 David Stuart, UCSB. PHENO’04 Jets+MET is a classic signature of QCD or beam splash or cosmics Confirm with track jets Calorimeter timing cuts Veto e and mu

40 David Stuart, UCSB. PHENO’04 Mono-Jets+MET results KK E T > 150 GeV no 2nd jet with E T >50 GeV E T > 150 GeV  > 30º

41 David Stuart, UCSB. PHENO’04 Mono-Jets+MET results E T > 150 GeV no 2nd jet with E T >50 GeV E T > 150 GeV  > 30º KK Predictions dominated by EWK backgrounds Z  + jet W   + jet Signal shape is indistinguishable from background.

42 David Stuart, UCSB. PHENO’04 Predict 100 ± 10 Stat &  Mono-Jets+MET results

43 David Stuart, UCSB. PHENO’04 Predict 100 ± 10 Stat &  Observe 63 Mono-Jets+MET results

44 David Stuart, UCSB. PHENO’04 Predict 100 ± 10 Stat &  Observe 63 Jet Energy scale is also a significant systematic on background and signal. Mono-Jets+MET results

45 David Stuart, UCSB. PHENO’04 Mono-Jets+MET results Monojet Predict 100 ± 10 Stat &  Observe 63 Jet Energy scale is also a significant systematic on background and signal.

46 David Stuart, UCSB. PHENO’04 Mono-Jets+MET results Obtain limits of ≈700 GeV Monojet Predict 100 ± 10 Stat &  Observe 63 Jet Energy scale is also a significant systematic on background and signal.

47 David Stuart, UCSB. PHENO’04 Di-Jets+MET results E T1 > 60 GeV, E T2 > 50 GeV Veto e and  30º <  < 165º H T > 275 E T > 175

48 David Stuart, UCSB. PHENO’04 Di-Jets+MET results Background predictions dominated by EWK not QCD Z  + 2jets W   + jet Expect 2.67 ± 0.95 events Observe 4 L = 85/pb E T1 > 60 GeV, E T2 > 50 GeV Veto e and  30º <  < 165º H T > 275 E T > 175

49 David Stuart, UCSB. PHENO’04 Di-Jets+MET results Background predictions dominated by EWK not QCD Z  + 2jets W   + jet Expect 2.67 ± 0.95 events Observe 4 L = 85/pb

50 David Stuart, UCSB. PHENO’04 Di-Jets+MET results Prediction and acceptance for M 0 = 25 GeV/c 2, A 0 =0, tan  = 3,  <0, varying M 1/2 L = 85/pb

51 David Stuart, UCSB. PHENO’04 Di-Photons+MET In GMSB models, gravitino is LSP 

52 David Stuart, UCSB. PHENO’04 Di-Photons+MET In GMSB models, gravitino is LSP   +E T is a broadly sensitive signature for GMSB

53 David Stuart, UCSB. PHENO’04 Di-Photons+MET E T > 13 GeV  <1.1 E T > 45 GeV  º  (E T,j)<170º Calorimeter timing

54 David Stuart, UCSB. PHENO’04 Di-Photons+MET E T > 20 GeV  <1.1 E T > 40 GeV  (E T,  )>30º  (E T,j)<145º L=185/pb

55 David Stuart, UCSB. PHENO’04 Di-Photons+MET Neutralino mass limits ≈ 105 GeV L=185/pb

56 David Stuart, UCSB. PHENO’04 Di-leptons+MET In MSUGRA models, neutralino LSP is stable  trileptons+E T and di-leptons+E T D0 has searched in both modes.

57 David Stuart, UCSB. PHENO’04 Like-sign  ±  ± +MET Like-sign  Predict 0.13 ± 0.06 Observe 1 event Like-sign  ±  ± p T1 >11 GeV/c p T2 >5 GeV/c  (E T,j)<145º  º  (E T,  )<145º E T > 40 GeV M  < 80 GeV/c 2

58 David Stuart, UCSB. PHENO’04 Di-lepton +MET + Track Select e  or ee + E T. Look for a 3rd, isolated track with p T > 3 Expect 1.2 ± 0.4, see 1Expect 0.5 ± 0.2, see 0

59 David Stuart, UCSB. PHENO’04 Di-lepton +MET SUSY Limits

60 David Stuart, UCSB. PHENO’04 Di-lepton +MET Higgs Limits See talks by P.Jonsson and S.Chuang Tuesday at 2pm. ee Dilepton mass cuts tightened at larger M H

61 David Stuart, UCSB. PHENO’04 Di-lepton +MET Higgs Limits See talks by P.Jonsson and S.Chuang Tuesday at 2pm.

62 David Stuart, UCSB. PHENO’04 Lepton +MET + bb Higgs Limits See talks by H.Kim and A.Metnitchouk Tuesday at 2pm.

63 David Stuart, UCSB. PHENO’04 Lepton +MET + bb Higgs Limits See talks by H.Kim and A.Metnitchouk Tuesday at 2pm.

64 David Stuart, UCSB. PHENO’04 bbbb Higgs Search At least 3 tagged jets

65 David Stuart, UCSB. PHENO’04 bbbb Higgs Search

66 David Stuart, UCSB. PHENO’04 Search for h   Limits on BR(h  ) < ≈60%

67 David Stuart, UCSB. PHENO’04 Search for Doubly Charged Higgs H ++ H -- Predicted e.g., in LR symmetric models W W H ++ Same-sign dilepton signature No events observed

68 David Stuart, UCSB. PHENO’04 Summary Many recent preliminary results with twice the Run 1 sample

69 David Stuart, UCSB. PHENO’04 Summary Many recent preliminary results with twice the Run 1 sample Cooking up another batch

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