1. Recent results from the Collider Detector at Fermilab (for the CDF collaboration) Rob Snihur (McGill University) CAP Congress 2007 – Saskatoon Energy Frontier and Phenomenology I June 19, 2007

2. Outline CDF Physics program Higgs Beyond the Standard Model – MSSM Higgs – Large Extra Dimensions: Pierre-Hugues Beauchemin (this afternoon 14:15) Top quark – Mass: Sebastian Carron (next talk) – Production Mechanism: Shabnaz Pashapour (this session) QCD – Di-b-jet cross section: Greg Williams (this session) – Exclusive gamma-gamma – Z + jets Electroweak – W mass: William Trischuk (yesterday) – WZ production b physics – Bs mixing – Sigma b observation – Cascade b observation Summary

3. 3 Canadian CDF institutions Umbrella organization: IPP University of Alberta –Bryan Caron, Andrew Hamilton, James Pinfold, Long Zhang McGill University –Adrian Buzatu, Phillipe Roy, Rob Snihur, Andreas Warburton, Greg Williams University of Toronto –Hugo Beauchemin, Sebastian Caron, Dan MacQueen, Shabnaz Pashapour, Pierre Savard, Teresa Spreitzer, Pekka Sinervo, William Trischuk

4. 4 Tevatron Integrated luminosity: 3 fb -1 delivered, 2.5 fb -1 on tape Projection: “base” = 4 fb -1, “design” = 8 fb -1 Highest instantaneous luminosity = 292.3 x 10 30  ~5 interactions

5. 5 CDF Upgrades for Run II: –New tracking system COT, silicon tracker –New forward calorimetry –Tracking at trigger level Tracks at L1 Displaced from PV@L2

6. 6 Some CDF results for Winter 2007 QCD –b-bbar dijet production –Z+jets cross section measurement –Z  b-bbar –Dijet production cross section measurement (1.13 fb -1 ) B Physics –Lifetime measurements: B+, B0, Bs and  B (1fb -1 ) –Rare decay searches: B +   +  - K+, B 0   +  - K*, B s   +  -  (1fb -1 ) B  hh Electroweak –Observation of WZ production –Evidence for ZZ production –W mass, width Top –Top mass in all-jets channel –Production cross section (lepton+isolated track) –Search for W' in the single top sample –Top Production Mechanism (gg vs qq) –Top Charge New Phenomena –Search for Large Extra Dimensions –Search for New Particles Coupling to Z+jets (b'->Z+b) in 1.1 fb -1 –SUSY trilepton combined limit - 0.7 to 1 fb -1 –High-mass dielectron (Z’ search) - 1.3 fb -1 Higgs (fb -1 ) –H   SUSY Higgs –H  WW ME-based analysis –ZH  llbb 2D-NN and MET fitter analysis

7. 7 Tevatron: close to 2 publications / week mb -  b - nb - pb - fb - 100 120 140 160 180 200 - - - Higgs Mass [GeV/c 2 ]  Total Inelastic bb WZWZ tt - - Higgs WH,ZH jets (qq, qg, gg) observed WZ, Single Top, ZZ M W ~0.05% M top ~1% B s –B s Oscillation Discovery + Precision Meas. M Higgs < 144 GeV at 95% CL - Reach 10 -19 m Low Mass SUSY Road to the Higgs!

8. 8 A direct path towards the Higgs Light or heavy Higgs? Strong b-tagging, large lepton coverage –X-section shows that we must use channels with large BF (no  ) Production

9. 9 Higgs searches combined Last update in mid March (new CDF result on WW, ZH)

10. 10 Higgs  WW Matrix Element method Expected background = 286.1 +- 23.3 background Expected signal (160 GeV) = 3.9 +- 0.3 Observed 323 candidates  < 1.3 pb (95% C.L) 10 Higgs mass hypotheses are shown

11. 11 ZH  ll bb Both ee & uu channels Small background –Mostly Z+jets Neural network –Discriminates event kinematics against Z+jets & tt background

12. 12 MSSM Higgs  Tau Tau

13. 13 Exclusive gamma gamma Andrew Hamilton, Bryan Caron, James Pinfold (University of Alberta) 2 central EM showers with E T > 5 GeV 3 events observed, consistent with      Background = 0.09 +- 0.04 events Significance = 3.7  Cross section < 410 fb May constrain exclusive Higgs predictions at LHC p p g g g dijet, ,  c, Higgs

14. 14 Z + jets 1.1 fb -1 Z  ee p T (jet) > 30 GeV |y(jet)| < 2.1 NLO agrees with data

15. 15 First observation of WZ Prob(background only) < 1.5  10 -7 (5.1  )  (WZ)=5.0 +1.8 -1.6 (stat.+syst.) pb

16. 16 First observation of B s oscillations PRL 97, 24003 2006 Number of B s decays –5600 fully reconstructed hadronic –3100 partially reconstructed hadronic –61500 partially reconstructed semileptonic  m s =17.77±0.10(stat)±0.07(syst) ps -1 > 5  effect Same data set used for previous (spring 06) limit Improved selection Improved analysis technique

17. 17 First observation of  b Fully reconstructed decay modes Likelihood ratio (no  b  b states) = 2.6 x 10 -19 m(Σ b + ) = 5808+2.0-2.3(stat.) ± 1.7(syst.) MeV/c 2 m(Σ b ¯ ) = 5816+1.0-1.0(stat.) ± 1.7(syst.) MeV/c 2 m(Σ b *+ ) = 5829+1.6-1.8(stat.) ± 1.7(syst.) MeV/c 2 m(Σ b *¯ ) = 5837+2.1-1.9(stat.) ± 1.7(syst.) MeV/c 2

18. 18 Observation of  b First ~2 fb -1 analysis Use standard  decay chain to select candidate events Use silicon hits to track  Topology similar to B+  J/  K+ Significance = 7.8  Mass = 5,792.9 +- 2.4(stat) +- 1.7(syst) MeV/c 2

19. 19 Example of Possible Fermilab Roadmap ILC EDR + R&D ILC System Test 1-2 RF Units Energy Frontier: Beyond ILC/LHC Reach: R&D for higher energy lepton and hadron colliders LHC LHC Upgrade beams from Booster, Main Injector protons MiniBooNE, SciBooNE, MINOS, MINERvA, NOvA Tevatron Running Tevatron Physics Intensity Frontier: High Intensity Protons ILC Construction ILC Decision Reconfiguring Accelerator Complex, , K, p beams - ILC Crymodule Industrialization Running 2 GeV + 6 GeV Linac + Recycler + Main Injector Running

20. 20 Summary Broad physics program at CDF –High pT –B physics New results on –SM & MSSM Higgs searches –QCD Exclusive gamma gamma production Z + jets –B physics Bs oscillations Sigma b observation More results presented at this conference –W mass –Large Extra Dimensions –B jet cross section –Top quark Mass Gluon-gluon vs quark quark

21. 21 ISL Cooling: Physics Impact Five Layer SVX is core of system – B-tagging – Lifetime measurements – Silicon vertex triggers use SVX alone Layer 00 – Improve vertex (eg B-tag) with point at beam pipe ISL – Not required for good B-tagging – High Lum point to help connect COT and SVX – High eta (|  |<2) tracking for forward electrons

22. 22 Single Top

23. 23 Tevatron Collisions The hard scattering is not all there is! –Parton Distribution Functions (PDF): fraction of (anti)proton carried by incoming partons. –Underlying Event (UE): extra stuff produce by spectator or multiple interactions. –Initial and Final State Radiation (ISR, FSR): extra gluons radiating off the original/final partons. –Jets: fragmentation of quark/gluons and recombination into hadrons reconstructed inside a cone.. All of these processes, and more, have an impact on what we measure

24. 24 Summary

25. 25 WH->l bb : Cut based Analyses Single b-tagged w/NN CDF results: Expect 95% C.L limit (m H =115 GeV) < 2.2 pb (< 17 times over SM) Observed limits: < 3.4 pb( < 26 times over SM) D0 results: Expect 95% C.L limit (m H =115 GeV) < 1.1 pb(< 9 times over SM) Observed limits: < 1.3 pb(< 11 times over SM) Cross section limit Ratio over SM

26. 26 Gluino vs. squark mass exclusion

27. 27 Chargino and Neutralino searches Both experiments look for SUSY signals –Chargino and neutralino are produced with sizeable cross sections –More difficult search for squarks and gluinos R. Strohemer

28. 28 Non SM Higgs Non SM Higgs(es) have sizeable decay rate to  pairs –Large efforts to bring up efficiency to trigger on tau events (and to detect tau) R. Strohemer