David Stuart, UC Santa Barbara for the CDF & D0...
Transcript of David Stuart, UC Santa Barbara for the CDF & D0...
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David Stuart, UCSB. PHENO’04Searches for new physicsat the Tevatron
David Stuart, UC Santa Barbara
for the CDF & D0 collaborations
PHENO’04, April 26, 2004
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David Stuart, UCSB. PHENO’04
(massabetized to avoid any indication of bias)
New physics has the same ingredients
as bread & butter physicsPhotons, 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’
ETjets ⇒ top or LQ or SUSY or Higgs
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David Stuart, UCSB. PHENO’04
New physics has the same ingredients
as bread & butter physicsPhotons, MET, leptons, jets, b’s
![Page 4: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/4.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
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David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
![Page 6: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/6.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
![Page 7: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/7.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
![Page 8: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/8.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
![Page 9: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/9.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
![Page 10: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/10.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
![Page 11: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/11.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
![Page 12: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/12.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
![Page 13: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/13.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
![Page 14: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/14.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
![Page 15: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/15.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
![Page 16: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/16.jpg)
David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
CDF and D0 obtain Z’σ•Br limits of ≈50 fb
⇒M>750 GeV (with SM couplings)
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David Stuart, UCSB. PHENO’04
Search for high mass di-leptons
See talk by M.Karagoz Unel Tuesday at 3pm.
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David Stuart, UCSB. PHENO’04
Search for high mass e+e- and γγ
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David Stuart, UCSB. PHENO’04
Search for high mass e+e- and γγ
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David Stuart, UCSB. PHENO’04
Search for high mass e+e- and γγ
= fSM + fKK η2 + fint η f = f(M,cosθ*)
η = ±πM4
S
2
Ms > 1.22 TeV (+)
Ms > 1.10 TeV (-)
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David Stuart, UCSB. PHENO’04
Excited electron search (eeγγ)
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David Stuart, UCSB. PHENO’04
Excited electron search (eeγγ)
See talk by H.Gerberich Tuesday at 6pm.
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David Stuart, UCSB. PHENO’04
Excited electron search (eeγγ)
See talk by H.Gerberich Tuesday at 6pm.
Expect 3 ± 0.4
Observe 3
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David Stuart, UCSB. PHENO’04
Excited electron search (eeγγ)
See talk by H.Gerberich Tuesday at 6pm.
![Page 25: David Stuart, UC Santa Barbara for the CDF & D0 collaborationsstuart.physics.ucsb.edu/Presentations/stuart_Pheno04.pdfDavid Stuart, UCSB. PHENO’04Searches for new physics at the](https://reader036.fdocuments.net/reader036/viewer/2022081403/60b16c4745e33909671bdb8a/html5/thumbnails/25.jpg)
David Stuart, UCSB. PHENO’04
Leptoquark Searches (eejj)
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David Stuart, UCSB. PHENO’04
Leptoquark Searches (eejj)
Require Scalar Sum of eejj ET > 450 GeVσ•Br < 60 fb ⇒ M > 238 GeV/c2 if Br(LQ→eq)=1
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David Stuart, UCSB. PHENO’04
Leptoquark Searches (eνjj)
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David Stuart, UCSB. PHENO’04
Leptoquark Searches
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David Stuart, UCSB. PHENO’04
Leptoquark Searches
Low β ⇒⇒ Jets + MET mode
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David Stuart, UCSB. PHENO’04
Jets+MET is a classic signature of<insert currently popular model name here>
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David Stuart, UCSB. PHENO’04
Jets+MET is a classic signature ofLarge extra dimensions
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David Stuart, UCSB. PHENO’04
Jets+MET is a classic signature ofLarge extra dimensions
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David Stuart, UCSB. PHENO’04
Jets+MET is a classic signature ofLarge extra dimensions
KK
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David Stuart, UCSB. PHENO’04
Jets+MET is a classic signature ofSupersymmetry
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David Stuart, UCSB. PHENO’04
Jets+MET is a classic signature ofSupersymmetry
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David Stuart, UCSB. PHENO’04
Jets+MET is a classic signature ofQuantum Chromodynamics
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David Stuart, UCSB. PHENO’04
Jets+MET is a classic signature ofQuantum Chromodynamics
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David Stuart, UCSB. PHENO’04
Jets+MET is a classic signature ofQCD or beam splash or cosmics
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David Stuart, UCSB. PHENO’04
Jets+MET is a classic signature ofQCD or beam splash or cosmics
Confirm with track jets
Calorimeter timing cuts
Veto e and mu
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David Stuart, UCSB. PHENO’04
Mono-Jets+MET results
KK
ET > 150 GeV
no 2nd jet with ET>50 GeV
ET > 150 GeVΔφ > 30º
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David Stuart, UCSB. PHENO’04
Mono-Jets+MET results
ET > 150 GeV
no 2nd jet with ET>50 GeV
ET > 150 GeVΔφ > 30º
KK
Predictions dominated by EWK backgrounds
Z → νν + jet
W → τν + jetSignal shape is indistinguishable from background.
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David Stuart, UCSB. PHENO’04
Predict 100 ± 10 Stat & δσ
Mono-Jets+MET results
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David Stuart, UCSB. PHENO’04
Predict 100 ± 10 Stat & δσ
Observe 63
Mono-Jets+MET results
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David Stuart, UCSB. PHENO’04
Predict 100 ± 10 Stat & δσ
Observe 63
Jet Energy scale is also a significantsystematic on background and signal.
Mono-Jets+MET results
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David Stuart, UCSB. PHENO’04
Mono-Jets+MET results
Monojet
Predict 100 ± 10 Stat & δσ
Observe 63
Jet Energy scale is also a significantsystematic on background and signal.
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David Stuart, UCSB. PHENO’04
Mono-Jets+MET results
Obtain limits of ≈700 GeV
Monojet
Predict 100 ± 10 Stat & δσ
Observe 63
Jet Energy scale is also a significantsystematic on background and signal.
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David Stuart, UCSB. PHENO’04
Di-Jets+MET results
ET1 > 60 GeV, ET2 > 50 GeVVeto e and µ
30º < Δφ < 165º
HT > 275
ET > 175
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David Stuart, UCSB. PHENO’04
Di-Jets+MET results
Background predictions dominated by EWK not QCD
Z → νν + 2jets
W → τν + jetExpect 2.67 ± 0.95 events
Observe 4
L = 85/pb
ET1 > 60 GeV, ET2 > 50 GeVVeto e and µ
30º < Δφ < 165º
HT > 275
ET > 175
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David Stuart, UCSB. PHENO’04
Di-Jets+MET results
Background predictions dominated by EWK not QCD
Z → νν + 2jets
W → τν + jetExpect 2.67 ± 0.95 events
Observe 4
L = 85/pb
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David Stuart, UCSB. PHENO’04
Di-Jets+MET results
Prediction and acceptance for M0 = 25 GeV/c2, A0=0, tan β = 3, µ<0, varying M1/2
L = 85/pb
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David Stuart, UCSB. PHENO’04
Di-Photons+MET
In GMSB models, gravitino is LSP ⇒
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David Stuart, UCSB. PHENO’04
Di-Photons+MET
In GMSB models, gravitino is LSP ⇒
⇒γγ+ET is a broadly sensitive signature for GMSB
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David Stuart, UCSB. PHENO’04
Di-Photons+MET
ET > 13 GeVη<1.1
ET > 45 GeV10º <Δφ(ET,j)<170º
Calorimeter timing
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David Stuart, UCSB. PHENO’04
Di-Photons+MET
ET > 20 GeVη<1.1
ET > 40 GeVΔφ(ET,γ)>30º
Δφ(ET,j)<145º
L=185/pb
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David Stuart, UCSB. PHENO’04
Di-Photons+MET
Neutralino mass limits
≈ 105 GeV
L=185/pb
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David Stuart, UCSB. PHENO’04
Di-leptons+MET
In MSUGRA models, neutralino LSP is stable
⇒trileptons+ET and di-leptons+ET
D0 has searched in both modes.
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David Stuart, UCSB. PHENO’04
Like-sign µ±µ± +MET
Like-sign µµ
Predict 0.13 ± 0.06
Observe 1 event
Like-sign µ±µ±
pT1>11 GeV/c
pT2>5 GeV/c Δφ(ET,j)<145º
30º<Δφ(ET,µ)<145º
ET > 40 GeVMµµ < 80 GeV/c2
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David Stuart, UCSB. PHENO’04
Di-lepton +MET + Track
Select eµ or ee + ET. Look for a 3rd, isolated track with pT > 3
Expect 1.2 ± 0.4, see 1Expect 0.5 ± 0.2, see 0
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David Stuart, UCSB. PHENO’04
Di-lepton +MET SUSY Limits
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David Stuart, UCSB. PHENO’04
Di-lepton +MET Higgs Limits
See talks by P.Jonsson and S.Chuang Tuesday at 2pm.
eµDilepton mass
cuts tightened
at larger MH
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David Stuart, UCSB. PHENO’04
Di-lepton +MET Higgs Limits
See talks by P.Jonsson and S.Chuang Tuesday at 2pm.
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David Stuart, UCSB. PHENO’04
Lepton +MET + bb Higgs Limits
See talks by H.Kim and A.Metnitchouk Tuesday at 2pm.
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David Stuart, UCSB. PHENO’04
Lepton +MET + bb Higgs Limits
See talks by H.Kim and A.Metnitchouk Tuesday at 2pm.
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David Stuart, UCSB. PHENO’04
bbbb Higgs Search
At least 3 tagged jets
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David Stuart, UCSB. PHENO’04
bbbb Higgs Search
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David Stuart, UCSB. PHENO’04
Search for h→γγ
Limits on BR(h→γγ) < ≈60%
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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
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David Stuart, UCSB. PHENO’04
Summary
Many recent preliminary results
with twice the Run 1 sample
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David Stuart, UCSB. PHENO’04
Summary
Many recent preliminary results
with twice the Run 1 sample
Cooking up another batch