1. 1/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004

2. 2/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Outline  Search for Large Extra Dimensions (LED) in Monojet + MET channel in ee combined with γγ channel via dedicated search with ee in μμ channel  Search for heavy gauge boson in ee channel in μμ channel  Search for excited electrons In this talk we report on For search for Higgs, SUSY and LQ see S. Beauceron, T. Kurca & D. Ryan’s talks

3. 3/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Tevatron - pp collider - -  Run I (1992 – 1995) √s = 1.8 TeV delivered ~ 130 pb -1  Run II (2002 – ong. ) √s = 1.96 TeV 36p x 36p bunches collisions every 396 ns record peak lumi. 6.7x 10 31 cm -2 s -1 delivers ~ 10 pb -1 /week 1.5 interactions/bunch crossing rate to tape 50 Hz - April 2001 Feb 2002 first data for analyses data for physics detector commissioning Jul 2002  High data taking efficiency in the range 80-90%  So far analyzed around 200 pb -1, which is already 2x the total Run I data. ~ 290 pb -1 on tape per experiment

4. 4/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 CDF & DZero Experiments  Extended spatial e, μ coverage  New plug calorimeter improves also MET measurement  Improved MET triggers  Added triggers to identify leptons at early stage  New silicon and fiber tracker  Solenoid (2 Tesla)  Upgrade of muon system  Upgrade of Trigger/DAQ

5. 5/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 New Phenomena Search Strategies Both CDF & DZero start searches with  signature based strategy categorize data into bins of various event signatures compare bins to SM predictions and search for signs of deviations  specific models show us the signatures of your favorite model we tell you if data contains any event with such signature and then the searches are tuned for best sensitivity on

6. 6/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 New Phenomena Search Challenges  Production cross sections very small σ(new phenomena) ~ 1 pb σ(pp inelastic) ~ 5x10 10 pb  Detectors are great, but not perfect particle detection efficiency < 100%  Often hard to distinguish signal from background jet based strategies overwhelmed by SM processes we employ lepton based signatures, but the rates are often suppressed -

8. 8/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Motivations for Extra Dimensions  Newton’s 1/r 2 law needs to be tested on submillimeter scales  Hierarchy puzzle - Why is gravity so weak? EWK scale is M EWK ~1TeV Gravity scale is M PL =1/√G N = 10 16 TeV  Hierarchy solution – Extra Dimensions. Gravity is localized (Randal Sundrum) on a different “brane” at d≠0 from the “brane” we live on - Gravity propagation to extra D (us) is exponentially damped Gravity is not weak! (Arkani-Ahmed, Dimopoulos,Dvali) It is diluted into many dimensions, 4+n, with n of them compactified to radius R -M 2 PL (4 D) = M 2+n PL (4+n D)R n - IF M PL (4+n D) ~ M EWK ~ 1TeV then if n=1 then R ~ 10 13 m (excluded by Newton’s 1/r 2 law) if n=2 then R~ 10 -3 m (WORTH OF TESTING!)

9. 9/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Strong Gravity ( ADD )  Compactified n dim. implies massive KK towers G KK of massless graviton G in each extra dim.  SM lives in 3+1D, G KK live in 4+n D  strength of gravity diluted  G KK couple to SM matter proportional 1/M PL (very weak coupling)  Huge number of KK modes sum up and yield to measurable effects Monojet+MET event signature q q g G kk q q g g V V _ _ Possible real graviton emmission Enable Graviton Mediated Processes Dilepton and diphoton event signature g g g

10. 10/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 LED with Monojet + MET Search for Real Graviton Emission DØ ∫Ldt = 85 pb -1 Data Selection: MET > 150 GeV, Jet1 > 150 GeV Jet2 < 50 (reduce ISR, FSR) ΔΦ J-MET > 30 o (reduce chance that MET comes from jet mismeasurement) Irreducible Background: Z-> νν + 1 or 2 jets (60% of total bckg.) Limit on Planck Scale M d After all selection cuts Observe 63, Expect 100 with ~60% uncertainty q q g G kk _ g g g heavy G escapes to extra D large MET recoil jet very energetic Analysis sensitive to jet energy scale (JES) uncertainty. Data versus SM LEP

11. 11/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004  η G = F/M S 4  F is a model dependent dimensionless parameter ~ 1: GRW: F = 1 HLZ: F = log(M s 2 /M 2 ), n =2 F = 2/(n-2), n > 2 Hewett: F = 2 λ /π, λ = ±1  M s is the UV cutoff = M PL(4+n dim) LED with ee & γγ - Theory Gravity effect parametrized by  G ee, γγ invariant mass Functions of M & cos  * determined by theory scatter. angle DØ Search Strategy:  Combine dielectron and diphoton to diEM signature  Fit distribution of M vs cos  * of Data – SM  Extract η G from the fit  Translate η G into M s limit Search for enhanced dilepton production

12. 12/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 LED with ee & γγ - Event Selection  Event Selection Two fiducial, central-central or central-forward, isolated EM objects E T > 25 GeV for both EM objects No track selection. Treat dielectron and diphoton samples together  LED search focuses on very high mass Drell-Yan region (graviton is heavy)  We are not searching for dilepton mass peaks (will do so in Z’ searches)  Region of interest is way above the Z mass  very energetic e & γ  Triggers high pT single or dielectron triggers diphoton triggers Unprescaled, >99% efficient due to high pT of EM objects 700 million events  9400 + 6800 events selected Central-Central DØ ∫Ldt = 200 pb -1 Central-Forward

13. 13/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004  Background estimation: Drell-Yan and direct diphoton production estimated from MC Instrumental backgrounds estimated from data that fail electron quality cuts Normalize backgrounds by fitting to the low di-em mass spectrum, where no LED signal is expected LED with ee & γγ - Data vs Background DØ ∫Ldt = 200 pb -1 Data QCD SM prediction Signal prediction Data vs MC

14. 14/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 LED with ee & γγ - DØ Limits  Data agrees with SM prediction  Extract η g parameter from fit  Translate  G 95% limits to 95% CL lower limits on Planck scale M S, in TeV, using different formalisms for F GRWHLZ for n =Hewett 2 3 4 5 6 7 λ = +1/-1 1.361.56 1.61 1.36 1.23 1.14 1.081.22/1.10 1.431.67 1.70 1.43 1.29 1.20 1.141.28/NA DØ RunII DØ RunI + Run II *NLO k=1.3 scale applied to signal MC

15. 15/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 LED with ee - CDF Limits  G 95% = 1.17 TeV -4  Data agrees with SM prediction  Extract parameter from M(ee) fit  Use cos  * as a cross check  Translate  G 95% limits to 95% CL lower limits on Planck scale M S, in TeV, using different formalisms for F GRWHLZ for n =Hewett 2 3 4 5 6 7 λ = +1/-1 1.111.11 1.17 0.99 0.89 0.83 0.790.99/0.96  G 95% = 1.05 TeV -4 λ = +1 λ = -1 * No NLO k factor applied to signal MC

16. 16/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 LED with μμ - DØ  Event selection pT > 15 GeV for both muon objects Isolated tracks M(mumu) > 50 GeV Cosmics removed Observed events 3,000 events No deviation from SM in data GRWHLZ for n =Hewett 2 3 4 5 6 7 λ = +1 0.880.75 1.05 0.88 0.80 0.74 0.700.79 Soon see results from 200pb -1 DØ ∫Ldt = 100 pb -1

17. 17/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 LED with μμ - CDF  Data agrees very well with SM predictions  New LED results are around the corner @ CDF from μμ channel

18. 18/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 LED with KK modes of Z & Photon  Model: compactified n extra dimensions chiral matter lives on 3D gauge bosons live in all dimensions -> existence Z & γ KK modes  Task: measure the effect of KK modes of Z and γ on ee production is bilinearly in η C = π 2 /3*M 2 PL(4+n dim) and depends on dilepton mass and scattering angle  Search strategy same as in LED: extract η C from fit and translate into a limit on M c  Note: at high masses the dilepton production is enhanced at intermediate masses M(Z)  M C the negative interference causes event deficit.  same tools as LED

19. 19/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004  Event Selection same as in diEM search, but >1 e must have track no electron isolation required Observed 14200 events No deviation from SM in data LED with KK modes of Z & Photon- Limit M C >1.12 TeV DØ ∫Ldt = 200 pb -1 Data QCD SM prediction Signal prediction Data vs MC

20. 20/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Localized Gravity ( RS ) with ee  Gravity Propagates in Compactified 5 th dim. -> Towers of Kaluza- Klein modes of the graviton  Coupling of G KK to Standard Model is of the order of TeV (determined by parameter k/M PL )  Graviton mediated ee production searched  CDF searched its high pT ee & μμ sample First direct constraints on RS

21. 21/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Localized Gravity ( RS ) with μμ

23. 23/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Z’ Search Motivation Z  if  = 0 Z η if  = tan -1 √(3/5) Z  if  = π/2 Z I if  = tan -1 (-√(3/5))  Extra U(1) gauge boson is predicted by BSM theories (SO(10),E 6 ) SSM : Z ’ couplings to fermions considered identical to the SM Z E 6 inspired models: E 6  SU(3) x SU(2) x U(1)y x U(1)  x U(1) , Z ’ = Z  sin  + Z  cos   We search for leptonic Z’ decays. (Br ~ 4% but very small bckg.)  Same high pT ee & μμ datasets searched as in LED analysis  Looking for a mass peak in M(dilepton) distribution, located beyond the Z peak (different from LED searches, where we fit the high mass continuum). Z’

24. 24/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Z’ in ee channel SM Couplings CDF : 750 DØ: 780 E 6 Z I Zχ Zψ Zη CDF: 570 610 625 650 DØ: 575 640 650 680 DØ ∫Ldt = 200 pb -1 Data QCD SM prediction Signal prediction 95% CL limit Z I Zχ Zψ Zη SM coupling  Same event selection as for the search for LED in ee channel (KK modes of gauge bosons).  Different data interpretation Limits (in GeV)

25. 25/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Z’ in μμ channel – Limits DØ ∫Ldt = 100 pb -1 DØ result with 200 pb -1 is coming soon.

27. 27/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004  CDF has searched for excited electrons (e * ), whose existence would indicate compositeness of electrons  At Tevatron, e * can be produced via contact interactions or gauge mediated interactions  We select events with ee  in the final state  Look for resonances in M(e  )  Region of interest lies beyond the Z mass ET(e1)>25 GeV, ET(e2)>25 GeV, ET(  )>25 GeV 81 GeV < M(ee) < 101 GeV (veto SM Z)  SM background: Z  events Contact Interaction Gauge Mediated Interaction Electron compositeness? In CDF ∫Ldt = 200 pb -1 we observed 3 events and expected 3 events M(e*)/Λ, Λ is the compositness scale f/Λ, f is the coupling to Z

28. 28/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Contact Interaction LimitGauge Mediated Interaction Limit Excited Electron Limits

29. 29/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Spectacular eeee Event Et(e1)=44 GeV Et(e2)=42 GeV Et(p1)=46 GeV Et(p2)=26 GeV MET=13 GeV Central tracker Calorimeter eta-phi lego plot  We are not only excluding, we are also measuring  ZZ candidate in eeee channel  σxBr ~ 9x10 -4

31. 31/32 Arnold Pompoš, Štrbské Pleso, Slovakia, April 14, 2004 Conclusion  Tevatron keeps breaking peak luminosity records and is steadily delivering collisions  CDF and DØ detectors are recording high quality data  We searched CDF’s and DØ’s high energy electron, muon and photon samples for signs of new phenomena  We set world leading limits on parameters of theories which consider the existence of extra dimensions, extra gauge boson or composite electron  We are still in only a fraction of the expected total luminosity of 8fb -1 (2009)  MORE GREAT PHYSICS RESULTS are coming soon and even more in few years.