1. 1 Recent results from TEVATRON Yuji Takeuchi (Tsukuba) for CDF and DZero collaborations 16 th YKIS Conference Progress in Particles Physics 2008 Feb. 18 th, 2009 Contents Latest Results from ∫Ldt~3fb -1 Top quark Search for SM Higgs

2. 2 CDF D0 Chicago TEVATRON MAIN INJECTOR Tevatron Run II Still at the Energy Frontier Tevatron: The world's highest-energy particle collider Proton-antiproton collisions at √s = 1.96 TeV Tevatron is performing really well: Reach 6 fb -1 and 7~8 fb -1 expected by the end of 2009.

3. 3 CDF/DZero CDF: 8 layer silicon vertex detector 8 super layer drift chamber 1.4T solenoid Good particle identification (K,  ) Central/Wall/Plug calorimeters Scintillator+drift chamber muon detectors DZero: 8 layer silicon vertex detector 16 layers scintillating fibers 2T solenoid Central/Endcap calorimenters 1.8T toroid 3 layer muon scintillator + drift tubes (Extended muon coverage)

4. 4 Continually establishing new records! –Peak luminosity ~3.5×10 32 cm -2 s -1 –Weekly integrated luminosity 78 pb -1 –Annual integrated luminosity 1.8 fb -1 (US FY 2008) –Avarage pbar accumulation rate 21×10 10 pbar/ hour Very stable operation –Maximizing integrated luminosity –10 weeks shutdown in 2009 summer Tevatron Status

5. 5 Integrated Luminosity Integrated luminosities for each US FY –Extrapolation for FY2009: ≳ 2 fb -1 FY 2009 FY08 FY09

6. 6 FY08 start 8.75 fb -1 7.29 fb -1 Highest Int. Lum Lowest Int. Lum FY10 start FY09 start ~ 1.8 fb-1 delivered in FY08 FY2010 Fermilab plans to run (if budget allows) and CDF/DZero are ready –Another 2 fb -1 ， total ~9 fb -1 FY2009 Run continues ~2 fb -1, total ~7 fb -1 Shutdown ： 10 weeks from June 1 Tevatron Prospects

7. 7 Top Quark Physics

8. 8 Top Pair production Dominant process 10%~20%

9. 9 Top Pair Signature Categorize ttbar events into 3 decay types according to W decay mode Dilepton 2 lepton 2 bjet MET All Hadronic 6jet(2bjet) Lepton+Jet 1lepton 4jet(2bjet) MET Top quark decays as a naked quark  Information on spin polarization and momentum is directly transfered to decay products

10. 10 Top Pair Production Cross-section Now better than theoretical uncertainties Luminosity is dominant source of uncertainty

11. 11  (ttbar)/  (Z) The total uncertainty is decreased by 10% by taking the ratio of the top pair to the Z cross sections +

12. 12 Top Quark Mass Goal before Run-II started : 3 GeV/c 2 with 2 fb -1 Now better than 1%

13. 13 Two Breakthroughs in Top Mass Measurements Matrix Element Method Use information on leptons and jets maximally in-situ W  jj JES calib. JES (jet energy scale) calibration using di-jet invariant mass from W Incorporate JES into likelihood function –L(M t )→L(M t,JES) –Turn JES systematics into statistics  Reduced with statistics of top events Observables Matrix element with a given top mass gives p.d.f. of observables Likelihood function of top mass for a given set of observables M ｊｊ →M W

14. 14 Top Mass Measurement World Best. Better than 1%

15. 15 W Helicity Information on t-W-b Vertex –Really V-A? –Really W boson? In the standard model

16. 16 W Helicity Measurements Results support V-A coupling on t-W-b vertex so far

17. 17 Search for anomalous top quark couplings at DZero

18. 18 Measurement of d σ /dMtt at CDF Singular Value Decomposition (SVD) of the response matrix κ/M Pl > 0.16 at the 95% CL

19. 19 Single Top Production S-channel t-channel Cross-section ∝ |Vtb| 2 –No need to assume unitarity of CKM matrix nor three generations of quarks On the assumption of CKM unitarity: Vtb = 0.99 3 generations: Can be derived from Br(t→Wb) Important to understand bkg of WH event for low mass higgs (mH<130 GeV) –Benchmark of higgs search in WH  WH ：  Single Top ～１：１０

20. 20 Single Top Summary CDF is now preparing combined results for 3.2fb -1

21. 21 Single Top Measurement with ME Technique Signal region

22. 22 Single Top Prospects Expected uncertainty on Vtb as a function of ∫Ldt Uncertainties arise from –Experiment –Cross-section dependence on Mt –Factorization and Renormalization scales –Parton distribution functions –  s

23. 23 W Boson Mass Prospects

24. 24 W Boson Mass

25. 25 W Boson Mass World average : M W = 80.398± 0.025 GeV/c 2 CDF: ΔM W =0.048 GeV/c 2 (L=200pb -1 )

26. 26 W Boson Mass Understanding the detector Bremsstrahlung tail Instantaneous luminosity dependence

27. 27 W Boson Mass Prospects Single experiment sensitivity better than the current world average expected Will significantly improve constraint on the Higgs boson mass

28. 28 Constraining the Higgs boson mass

29. 29 SM Higgs Search

30. 30 Low mass Higgs region: m H <135 GeV/c 2 H → bb dominant decay. Search for associated W/Z production. High mass Higgs region: m H >135 GeV/c 2 H → WW dominant decay. Gluon fusion production search (gg → H). Higgs Cross-section and BR

31. 31 WH  l bb CDF: Updated on Nov 7, 2008 Combined result of NN and ME+BDT Improved by 15% Limit/SM < 4.8 @115 GeV/c 2 DZero: Updated on Feb 5, 2009 Limit/SM < 6.7 @115 GeV/c 2

32. 32 Combined Limits DZero: Updated on Aug 2, 2008 New WH  l bb result NOT included WH  l bb WH  WWW CDF: Updated on Jan 16, 2009 Updates since last summer –WH  l bb –WH  WWW –ZH  llbb ZH  llbb

33. 33 Higgs Exclusion @ Tevatron One mass, 170 GeV, excluded @ 95% CL A 15 GeV window [162:177] excluded @ 90% CL CDF+DZero combination Updated on Jul 30, 2008

34. 34 Projections CDF+DZero projections assuming they perform the same Possible improvements: – Acceptance, Analysis method, jet/MET resolutions,... Good possiblity to see 3  evidence to a Higgs of 160 GeV/c 2

35. 35 Conclusion Tevatron is operating well. Better than ever! CDF and DZero experiment are ready to run FY2010. ∫Ldt ~ 9 fb -1 is expected. Top quark properties are being measured more and more precisely. Mass precision is now less than 1%. Top quark properties are consistent with SM so far. We are sensitive to a Higgs of 160 GeV/c 2. Stay tune for interesting results with ≳ 3fb -1 in 2009!