Tevatron KEK-PH2011 3/2/2011 Koji Sato Contents Introduction Tevatron Accelerator, CDF and D0 Detectors. Top Physics Direct Search for Higgs Bosons Standard Model Higgs MSSM Higgs Bosons Introduction Tevatron Run II p p collisions at s = 1.96 TeV (1.8 TeV in Run I). Run II started in Summer Two multi-purpose detectors for wide range of physics studies. Tevatron Run II Luminosity Status Typical Peak Luminosity : 3-4 cm 2 s -1. Delivers pb -1 /week. Integrated Luminosity: 10.4 fb -1 Recorded by CDF: 8.7 fb -1. Recent CDF analyses typically use up to ~7 fb -1. Typical data taking efficiency of CDF: ~ 85% No significant drop after 10 years of running. (CDF) Tevatron Plans 2010: strong discussion on 3 year extention of Tevatron up to FY2014. Tevatron was expected to compete with LHC in SM Higgs searches in M H 3 Evidence In 10020, | | 0.71 at 95% C.L. W Mass Measurement CDF, 200 fb -1 (2007) D0, 1 fb -1 (2009) Best single measurement of the time.Best single measurement! W Mass World Average Top Mass Measurement in L+jets Events (CDF) t t q q g g b b W+W+ W-W- l+l+ q q 15%85% 100% Controls background by a Neural Net Discriminant: Matrix Element Detector Response Func. x: parton level momenta y: measured momenta PDFs 2-D likelihood Fit to data : In-situ JES calibration 1-btag2>b-tag Background261.8 9.6 Top signal767.3 43.0 Observed Data m t = 0.7 (stat.) 0.6 (JES) 0.9 (syst.) GeV/c 2 = 1.2 (total) GeV/c 2 Best single measurement, 0.7% precision! Top Mass World Average Constraint to SM Higgs Mass (Jul 2010) 24 M top = 1.1 GeV/c 2 M W = GeV/c Precise W and Top Mass measurements constrains the SM Higgs Mass due to the radiative correction: m H < % CL (mH = /-26 GeV) m H < % CL including LEP2 direct search limit Constraint to SM Higgs Mass (Jul 2010) 25 mH < % CL (mH = /-26 GeV) M top = 1.1 GeV/c 2 M W = GeV/c 2 In 2003: M top = 4.3 GeV/c 2 M W = 32 MeV/c 2 M higgs < 260 GeV/c 2 (95% C.L.) Progress due to the TEVATRON Run II Results Precise W and Top Mass measurements constrains the SM Higgs Mass due to the radiative correction: Direct Search for Higgs Bosons Production Cross Sections recently observed SM Higgs Properties at Tevatron bbWW mH135 GeV (high mass): Easiest to look for HWW with one or two W decaying to lepton. WH l bb (low mass) S/B separation by NN. Four tagging categories, using 3 algorithms (including NN tagger). NN based b-jet energy correction NN Outputs: 2 tag1 tag Observed upper limit 4.5 x GeV) l l 3 b-tag categories with 2 algorithms. S/B separation by NN. Improved lepton coverage with new loose muon category. Dominant backgrounds: Z+jets, top, diboson ZH ll+bb (low mass) (m H =120 GeV) NN Outputs: Observed upper limit 6.0 x GeV) WH/ZH MET+bb (low mass) Target process: ZH bb Also complementary to WH l bb search. 3 b-tag categories with 2 algorithms. S/B separation by NN. Dominant backgrounds: QCD with MET miscalculation W/Z+jets, top, diboson (m H =115 GeV) 2 tag1 tag Observed upper limit 2.3 x GeV) H WW* l + l - (high mass) Opposite Sign 2 leptons. Lepton acceptance improved by using isolated tracks. S/B separation by NN. Matrix element calculation result input to NN. Dominant background DY, Diboson, top Independently analyses OS/SS 2 leptons + 1/2 jets events to include WH WWW and VBF H WW signal inacceptance. Observed upper limit : 1.08 x GeV) Summary of SM Higgs Searches at CDF SM Higgs CDF and D0 Combined Limits CDF Combined:D0 Combined: SM Higgs Tevatron Combined Limit 95% CL exclusion : 158 < m H