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					               Searches for new physics
David Stuart, UCSB. PHENO’04




                   at the Tevatron
                               David Stuart, UC Santa Barbara
                               for the CDF & D0 collaborations




                                  PHENO’04, April 26, 2004
David Stuart, UCSB. PHENO’04


   New physics has the same ingredients
        as bread & butter physics
                           Photons, MET, leptons, jets, b’s
                               (massabetized to avoid any indication of bias)




   Similar Combinations:
                        Z or Z’

              ETjets  top or LQ or SUSY or Higgs
   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.
David Stuart, UCSB. PHENO’04


   New physics has the same ingredients
        as bread & butter physics
                           Photons, MET, leptons, jets, b’s




                                            QuickTime™ and a
                                   TIFF (Uncompressed) decompressor
                                      are need ed to see this picture.
David Stuart, UCSB. PHENO’04


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


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


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


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


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


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


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


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


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


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


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


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


              Search for high mass di-leptons

                                CDF and D0 obtain Z’
                                sBr limits of 50 fb
                                M>750 GeV (with SM couplings)
David Stuart, UCSB. PHENO’04


              Search for high mass di-leptons




See talk by M.Karagoz Unel Tuesday at 3pm.
David Stuart, UCSB. PHENO’04


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


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


              Search for high mass e+e- and gg
                               = fSM + fKK h2 + fint h    f = f(M,cosq*)
                                                                  2
                                                          h =±
                                                                 pM4S



                                                   Ms > 1.22 TeV (+)
                                                   Ms > 1.10 TeV (-)
David Stuart, UCSB. PHENO’04


                  Excited electron search (eegg)
David Stuart, UCSB. PHENO’04


                  Excited electron search (eegg)




See talk by H.Gerberich Tuesday at 6pm.
David Stuart, UCSB. PHENO’04


                  Excited electron search (eegg)




                                          Expect 3 ± 0.4
                                          Observe 3




See talk by H.Gerberich Tuesday at 6pm.
David Stuart, UCSB. PHENO’04


                  Excited electron search (eegg)




See talk by H.Gerberich Tuesday at 6pm.
David Stuart, UCSB. PHENO’04


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


                      Leptoquark Searches (eejj)




                    Require Scalar Sum of eejj ET > 450 GeV
                    sBr < 60 fb  M > 238 GeV/c2 if Br(LQeq)=1
David Stuart, UCSB. PHENO’04


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


                               Leptoquark Searches
David Stuart, UCSB. PHENO’04


                               Leptoquark Searches




   Low b 
                                             Jets + MET mode
David Stuart, UCSB. PHENO’04


                   Jets+MET is a classic signature of
                        <insert currently popular model name here>
David Stuart, UCSB. PHENO’04


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


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


                   Jets+MET is a classic signature of
                               Large extra dimensions




                                                  KK
David Stuart, UCSB. PHENO’04


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


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


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


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


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

                               Mono-Jets+MET results
                                      KK
                                            ET > 150 GeV
                                            no 2nd jet with ET>50 GeV
                                            ET > 150 GeV
                                            Df > 30º
David Stuart, UCSB. PHENO’04

                               Mono-Jets+MET results
                                      KK
                                               ET > 150 GeV
                                               no 2nd jet with ET>50 GeV
                                               ET > 150 GeV
                                               Df > 30º



                  Predictions dominated by EWK backgrounds
                     Z  nn + jet
                     W  n + jet
                  Signal shape is indistinguishable from background.
David Stuart, UCSB. PHENO’04

                               Mono-Jets+MET results

Predict 100 ± 10               Stat & ds
David Stuart, UCSB. PHENO’04

                               Mono-Jets+MET results

Predict 100 ± 10               Stat & ds


Observe 63
David Stuart, UCSB. PHENO’04

                               Mono-Jets+MET results

Predict 100 ± 10               Stat & ds


Observe 63

Jet Energy scale is also a significant
systematic on background and signal.
David Stuart, UCSB. PHENO’04

                               Mono-Jets+MET results

Predict 100 ± 10               Stat & ds


Observe 63                                         Monojet
Jet Energy scale is also a significant
systematic on background and signal.
David Stuart, UCSB. PHENO’04

                               Mono-Jets+MET results

Predict 100 ± 10               Stat & ds


Observe 63                                               Monojet
Jet Energy scale is also a significant
systematic on background and signal.




                                            Obtain limits of ≈700 GeV
David Stuart, UCSB. PHENO’04


                               Di-Jets+MET results



  ET1 > 60 GeV, ET2 > 50 GeV
  Veto e and m
  30º < Df < 165º
  HT > 275
  ET > 175
David Stuart, UCSB. PHENO’04


                                  Di-Jets+MET results



                                                                            L = 85/pb
  ET1 > 60 GeV, ET2 > 50 GeV
  Veto e and m
  30º < Df < 165º
  HT > 275
  ET > 175



                       Background predictions dominated by EWK not QCD
                               Z  nn + 2jets   Expect 2.67 ± 0.95 events
                               W  n + jet     Observe 4
David Stuart, UCSB. PHENO’04


                                  Di-Jets+MET results



                                                                            L = 85/pb




                       Background predictions dominated by EWK not QCD
                               Z  nn + 2jets   Expect 2.67 ± 0.95 events
                               W  n + jet     Observe 4
David Stuart, UCSB. PHENO’04


                               Di-Jets+MET results

                                                   L = 85/pb




      Prediction and acceptance for M0 = 25 GeV/c2, A0=0, tan b = 3, m<0, varying M1/2
David Stuart, UCSB. PHENO’04


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


                               Di-Photons+MET
   In GMSB models, gravitino is LSP 




      gg+ET is a broadly sensitive signature for GMSB
David Stuart, UCSB. PHENO’04


                               Di-Photons+MET

                                                ET > 13 GeV
                                                h<1.1
                                                ET > 45 GeV
                                                10º <Df(ET,j)<170º
                                                Calorimeter timing
David Stuart, UCSB. PHENO’04


                               Di-Photons+MET


                                                   ET > 20 GeV
                                        L=185/pb
                                                   h<1.1
                                                   ET > 40 GeV
                                                   Df(ET,g)>30º
                                                   Df(ET,j)<145º
David Stuart, UCSB. PHENO’04


                               Di-Photons+MET

                                L=185/pb




             Neutralino mass limits
               ≈ 105 GeV
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.
David Stuart, UCSB. PHENO’04


                                Like-sign m±m± +MET
                                                 Like-sign m±m±
                                                 pT1>11 GeV/c
                                                 pT2>5 GeV/c
                                                  Df(ET,j)<145º
                                                  30º<Df(ET,m)<145º
                                                 ET > 40 GeV
                                                 Mmm < 80 GeV/c2


                   Like-sign mm

                           Predict 0.13 ± 0.06
                           Observe 1 event
David Stuart, UCSB. PHENO’04


                               Di-lepton +MET + Track
     Select em or ee + ET. Look for a 3rd, isolated track with pT > 3




               Expect 0.5 ± 0.2, see 0       Expect 1.2 ± 0.4, see 1
David Stuart, UCSB. PHENO’04


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


                           Di-lepton +MET Higgs Limits


                                                         Dilepton mass
                                 em                      cuts tightened
                                                         at larger MH




See talks by P.Jonsson and S.Chuang Tuesday at 2pm.
David Stuart, UCSB. PHENO’04


                           Di-lepton +MET Higgs Limits




See talks by P.Jonsson and S.Chuang Tuesday at 2pm.
David Stuart, UCSB. PHENO’04


                       Lepton +MET + bb Higgs Limits




See talks by H.Kim and A.Metnitchouk Tuesday at 2pm.
David Stuart, UCSB. PHENO’04


                       Lepton +MET + bb Higgs Limits




See talks by H.Kim and A.Metnitchouk Tuesday at 2pm.
David Stuart, UCSB. PHENO’04


                               bbbb Higgs Search

                                            At least 3 tagged jets
David Stuart, UCSB. PHENO’04


                               bbbb Higgs Search
David Stuart, UCSB. PHENO’04


                               Search for hgg




         Limits on BR(hgg) < ≈60%
David Stuart, UCSB. PHENO’04


                   Search for Doubly Charged Higgs
                                     Predicted e.g., in LR symmetric models
                               H++
                                     No events observed



                               H--
                               H++
                       W



                               W


 Same-sign dilepton
 signature
David Stuart, UCSB. PHENO’04


                                     Summary

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


                                     Summary

                      Many recent preliminary results
                      with twice the Run 1 sample

                      Cooking up another batch

				
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