1 / 28

Recent results from the Collider Detector at Fermilab (for the CDF collaboration)

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. Outline. CDF Physics program Higgs Beyond the Standard Model MSSM Higgs

erasmus-copeland
Download Presentation

Recent results from the Collider Detector at Fermilab (for the CDF collaboration)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Recent results from theCollider Detector at Fermilab (for the CDF collaboration) Rob Snihur (McGill University) CAP Congress 2007 – SaskatoonEnergy 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. 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. 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 1030 ~5 interactions

  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. 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 LB (1fb-1) Rare decay searches: B+m+m- K+, B0m+m- K*, Bsm+m- (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tt SUSY Higgs HWW ME-based analysis ZHllbb 2D-NN and MET fitter analysis Some CDF results for Winter 2007

  7. Tevatron: close to 2 publications / week Road to the Higgs!  Total Inelastic Reach 10-19 m jets (qq, qg, gg) mb - - - Bs–Bs Oscillation Discovery + Precision Meas. bb observed b - W Z MW ~0.05% nb - - tt Mtop ~1% WZ, Single Top, ZZ pb - Higgs WH,ZH MHiggs < 144 GeV at 95% CL Low Mass SUSY fb - - - - 100 120 140 160 180 200 Higgs Mass [GeV/c2]

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

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

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

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

  12. MSSM Higgs  Tau Tau

  13. p g dijet, , c, Higgs g g p Exclusive gamma gammaAndrew Hamilton, Bryan Caron, James Pinfold(University of Alberta) • 2 central EM showers with ET > 5 GeV • 3 events observed, consistent with gg, p0p0, hh • Background = 0.09 +- 0.04 events • Significance = 3.7 s • Cross section < 410 fb • May constrain exclusive Higgs predictions at LHC

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

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

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

  17. First observation of Sb • Fully reconstructed decay modes • Likelihood ratio (no Sb / 4 Sb states) = 2.6 x 10-19 m(Σb+)  = 5808+2.0-2.3(stat.) ± 1.7(syst.) MeV/c2 m(Σb¯) = 5816+1.0-1.0(stat.) ± 1.7(syst.) MeV/c2 m(Σb*+) = 5829+1.6-1.8(stat.) ± 1.7(syst.) MeV/c2 m(Σb*¯) = 5837+2.1-1.9(stat.) ± 1.7(syst.) MeV/c2

  18. Observation of Xb • First ~2 fb-1 analysis • Use standard X decay chain to select candidate events • Use silicon hits to track X • Topology similar to B+  J/Y K+ • Significance = 7.8 s • Mass = 5,792.9 +- 2.4(stat) +- 1.7(syst) MeV/c2

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

  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. 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. Single Top

  23. 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 Tevatron Collisions

  24. Summary

  25. CDF results: Expect 95% C.L limit (mH =115 GeV) < 2.2 pb (< 17 times over SM) Observed limits: < 3.4 pb( < 26 times over SM) WH->lbb : Cut based Analyses Single b-tagged w/NN D0 results: Expect 95% C.L limit (mH =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. Gluino vs. squark mass exclusion

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

More Related