1. FNAL Users’ Meeting, 06/02/03, p. 1 Top and Electroweak Results from CDF Igor Volobouev LBNL for the CDF Collaboration

2. FNAL Users’ Meeting, 06/02/03, p. 2 Igor Volobouev Top / Electroweak Program Measurement of fundamental parameters  Calibration (e.g., M Z )  Precision measurements of M top, M W, V tb, etc. Tests of Standard Model predictions  Cross sections, branching fractions, kinematical distributions, lepton universality  Top quark properties: unique to CDF/D0 Searches for new phenomena  Higgs  Anomalous couplings, new particles and resonances, rare and forbidden decays Discovery potential exists in all areas

3. FNAL Users’ Meeting, 06/02/03, p. 3 Igor Volobouev TOF  =2  =3  =1 CDF Run 2 Upgrade Improved Si coverage  |  | < 2  up to 8 layers New central tracker  96 layers Time of Flight Expanded muon system Forward calorimeter Trigger and electronics  = -ln(tan(  /2))

4. FNAL Users’ Meeting, 06/02/03, p. 4 Igor Volobouev Run 2 Data Sample Total current sample on tape:  175 pb -1 “Winter analyses” sample: 56-91pb -1 4-9 pb -1 /week  90% efficiency “Winter” sample Commissioning Delivered On Tape Store Number Total Luminosity (pb -1 )

5. FNAL Users’ Meeting, 06/02/03, p. 5 Igor Volobouev Electroweak Measurements Unambiguous predictions from the Standard Model, world averages, Run 1 measurements  W, Z production cross sections  Lepton universality  Forward-backward asymmetry  Di-boson production “New physics” reach at a few hundred pb -1 Data analysis infrastructure  Lepton and photon identification  W and Z signatures  Calibrations  Luminosity monitoring W  e Z  

6. FNAL Users’ Meeting, 06/02/03, p. 6 Igor Volobouev   B(W  l l ) EventsBackground  B(W  l l ) (nb) e386256% 2.64±0.01 stat ±0.09 sys ±0.16 lum  2159911% 2.64±0.02 stat ±0.12 sys ±0.16 lum Clean signature  Isolated lepton  Missing E T High  and S/B 72 pb -1 W  

7. FNAL Users’ Meeting, 06/02/03, p. 7 Igor Volobouev W    and Lepton Universality Narrow, isolated hadronic jet from  Missing E T > 25 GeV Electrons removed Relatively low background (  26%)   B(W   ) = 2.62 ± 0.07 stat ± 0.21 sys ± 0.16 lum nb

8. FNAL Users’ Meeting, 06/02/03, p. 8 Igor Volobouev   B(Z  ll) Two leptons: negligible background (< 1%) Used for calibrations: energy scale, resolutions l =e: 267±6 stat ±15 sys ±16 lum pb l =  : 246±6 stat ±12 sys ±15 lum pb

9. FNAL Users’ Meeting, 06/02/03, p. 9 Igor Volobouev A FB with Z 0 /  *  e + e - Forward-backward asymmetry: Probes  /Z interference, sensitive to new physics High mass reach is unique to Tevatron Measurement is consistent with the SM prediction

10. FNAL Users’ Meeting, 06/02/03, p. 10 Igor Volobouev pp  W , Z , WW Depend on trilinear gauge couplings (s-channel): Events found  expected W  Z  WW   4.3 Results are statistics-limited, consistent with the SM predictions Di-boson Cross Sections W W  q q'q' 81 events

11. FNAL Users’ Meeting, 06/02/03, p. 11 Igor Volobouev Top Quark Measurements Main question: is top quark adequately described by the Standard Model? Run 2 results so far:  Cross section  Top mass Many precision tests of top to come with more data SM: tt production cross section at 1.96 TeV is 30% larger than at 1.8 TeV Top spin polarization Production Cross Section Resonance production ? Production kinematics

12. FNAL Users’ Meeting, 06/02/03, p. 12 Igor Volobouev Dilepton Cross Section Signature: 2 leptons, 2 jets, missing E T Backgrounds: WW, Z  , Drell-Yan, fake leptons Event selection: signature and  Scalar transverse energy > 200 GeV  Background rejection: photon conversion veto, Z veto, lepton isolation,  for missing E T Found 5 candidates, expected 0.3 background events  tt =13.2 ± 5.9 stat ± 1.5 sys pb

13. FNAL Users’ Meeting, 06/02/03, p. 13 Igor Volobouev Lepton + Jets Cross Section ControlSignal 15 candidate events with b tags, 3.8 background  tt = 5.3 ± 1.9 stat ± 0.8 sys pb

14. FNAL Users’ Meeting, 06/02/03, p. 14 Igor Volobouev Lepton + Jets Cross Section ControlSignal 15 candidate events with b tags, 3.8 background  tt = 5.3 ± 1.9 stat ± 0.8 sys pb

15. FNAL Users’ Meeting, 06/02/03, p. 15 Igor Volobouev tt Cross Section Summary hep-ph/0303085 (M. Cacciari et al)

16. FNAL Users’ Meeting, 06/02/03, p. 16 Igor Volobouev Top Quark Mass Lepton + jets channel: Run 1 CDF result was 176.1 ± 6.6 GeV/c 2 Statistical error is mainly due to jet combinatorics. M top with b tags will be presented at the summer conferences. Systematic errors will dominate the uncertainty  Jet energy reconstruction  MC top decay modeling  Background 33 events

17. FNAL Users’ Meeting, 06/02/03, p. 17 Igor Volobouev Future Run 2 Measurements Electroweak  Drell-Yan at high mass (PDFs, new physics)  W charge asymmetry  Direct W width  pp  WZ, ZZ, trilinear couplings  M W with  40 MeV/c 2 precision (400 pb -1 are needed if 1/  L scaling holds) Top  Analysis of production and decay kinematics –Resonant production –W helicity –Spin correlations  Single top production  V tb  Rare and forbidden decays  M t with  3 GeV/c 2 precision Many of these measurements are already in the works

18. FNAL Users’ Meeting, 06/02/03, p. 18 Igor Volobouev Higgs Constraint Current SM Higgs fit: M H = 81 +52 –33 GeV LEP 2 direct search limit: M H > 114.4 GeV at 95% CL

19. FNAL Users’ Meeting, 06/02/03, p. 19 Igor Volobouev Summary A variety of Run 1 results have been reestablished  We are confident that CDF components are working as expected and the system integration was a success  Our understanding of the CDF detector is improving. We have already developed many building blocks needed for taking on really challenging physics problems. So far, top and electroweak results are consistent with the Standard Model predictions Most measurements are statistics limited, and will benefit from larger datasets Expect many new and improved Run 2 results this summer and during the next few years

20. FNAL Users’ Meeting, 06/02/03, p. 20 Igor Volobouev Backup Slides

21. FNAL Users’ Meeting, 06/02/03, p. 21 Igor Volobouev Electron Identification CEM transverse energy E T > 20 GeV Track p T > 10 GeV/c Track |z 0 | < 60 cm E T /p T < 2.0 when E T < 50 GeV Cluster E HAD /E EM < 0.055 + 0.00045 * E Track-to-shower match  3 cm Fractional calorimeter energy isolation < 0.1 Shower profile consistent with electron Fiducial to CES

22. FNAL Users’ Meeting, 06/02/03, p. 22 Igor Volobouev Muon Identification Track p T > 20 GeV/c Track |z 0 | < 60 cm Cosmic ray veto E EM < 2 + max(0, 0.0115 * (p - 100)) GeV E HAD < 6 + max(0, 0.0280 * (p - 100)) GeV Fractional calorimeter energy isolation < 0.1 Track match to a muon chamber stub: 3, 5, and 6 cm for CMU, CMP, and CMX, respectively

23. FNAL Users’ Meeting, 06/02/03, p. 23 Igor Volobouev B Jet Tagging with SVX At least two well-reconstructed tracks with  3 silicon hits Secondary vertex L XY significance at least +3  Efficiency in tt events: 45  1  5 % for “taggable” jets

24. FNAL Users’ Meeting, 06/02/03, p. 24 Igor Volobouev Weekly Delivered Luminosity

25. FNAL Users’ Meeting, 06/02/03, p. 25 Igor Volobouev Downtime and Deadtime Downtime – much better when we keep taking data… –HV Trips (COT, Silicon, muon, etc.) (not so often these days) –L3/EVB/CSL/L2, etc. (comes/goes in wave. Right now, it is good) –HRRs (bunch counter errors, TDC done timeout, etc.) –Trigger table tests, 2 SRC tests, XFT tests… (future investment) –Startup time, waiting to bring up HV at beginning of the store –Silicon D-mode calibration and other odds and ends –Downtime due to operator errors are very small Dead time – much easier when lumi is low and trigger rates low, but… –L1/L2 busy dead time (much work in progress, eg. 2SRC readout) –Hitting CSL output limit -- design 20Mb/sec. This current problem should be solved by: Tightening (wisely) trigger filters, limiting L3 output rates Dropping L3 reconstruction banks and other diagnostic banks Compressing silicon/COT raw data banks, etc. –However, at the same time, we are also reviewing/studying the possibility/consequence of extending the current CSL 20Mb/sec limit

26. FNAL Users’ Meeting, 06/02/03, p. 26 Igor Volobouev Di-boson Run 2 Results Cross section for E T (  ) > 7 GeV,  R > 0.7 :  (W  ) = 17.2  3.8(stat.)  2.8(sys.)  1.0(lum.) pb SM:  (W  ) = 18.7  1.3 pb W , electron channel  (W  ) = 19.8  4.5(stat.)  2.4(sys.)  1.2(lum.) pb SM:  (W  ) = 18.7  1.3 pb W , muon channel  = 5.8  1.3(stat.)  0.7(syst.)  0.3(lum.) pb SM:  = 5.3  0.4 pb Z , combined WW: expected 2.8 signal and 1.5 background events (SM), found 2