Improvements on the Higgs searches in the high mass region at CDF M. Bauce on behalf of the CDF collaboration INFN Padova Higgs Hunting workshop, Orsay, 9-3 July 0 M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 /
Higgs production and decay Four main production mechanism at Tevatron: σ m H =65 GeV SM 0.6 pb gg H (78 %) qq WH (9 %) qq ZH (6 %) qq qq H (7 %) All of them become important with increasing sensitivity. High mass region defined for M H 35 GeV/c H WW is the dominant decay channel H ZZ is also relevant for M H ranges where WW is not the most sensitive ([40-50] & [>80] GeV/c ) This analysis considers H WW decay channel W decays: W lν, l=e,µ,τ W hadrons have large background, not yet included in the analysis M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 /
H WW* Analysis Multi-channel analysis leptons (e,µ) in the final state Separated by event topology Different dominant background O.S. 0 jets WW O.S. jet DY O.S. or more jets tt S.S. or more jets W+jets O.S. M ll <6 GeV/c Wγ (fake) Neural Network trained for each M H Different set of variables for different channel M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 3 /
H WW* with Hadronic Tau decay channel + 4% signal Include W τ + ν hadrons+ν One trigger e or µ, one hadronically decaying tau in the final state Main background: W+jets (jet faking τ) Validated with background dominated control regions Signal efficiency dominated by τ reconstruction efficiency Boosted Decision Tree (BDT): τ ID variables + kinematic variables Entries CDF Run II Preliminary eτ channel L dt = 5.9 fb m H = 65 GeV/c data (5.9 fb ) H WW Drell Yan W+jet W+γ WW/WZ/ZZ tt total Bkg error 3 0.4 0. 0 0. 0.4 0.6 BDT output M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 4 /
Tri-lepton - orthogonal to the main HWW analysis + 3.8% signal I Split analysis in three channel: inz : `` S. Flav., mz ±5 GeV/c, jet inz : `` S. Flav., mz ±5 GeV/c, + jets No-Z : orthogonal to inz, any jets I NN with different set of variables L = 5.9 fb - CDF Run II 4 WH Signal (Z Removed): MH = 65 GeV/c Total tt ZZ Zgamma Wj WZ WH ZH Data 3.5 3.5.5 0.5 0 - -0.8-0.6-0.4-0. 0 0. 0.4 0.6 0.8 NN Output M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 5 /
Latest results on 5.9 fb Binned likelihood for each H mass and for each channel combined Standard Model exclusion sensitivity reached around M H =65 GeV/c Exclusion limits for the different channels, M H =65 GeV/c M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 6 /
Future Perspective Improvements More data: fb by the end of 0 H ZZ H ZZ llνν:.45 signal events in 6 fb for M H =90 GeV/c 5 σ SM (naively) expected limit for M H =90 GeV/c H WW lνjj: in progress Significant BR but large background Improvements on lepton ID Lower leptons p T requirements Loosening lepton isolation cut CDF is on the race to the Higgs! M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 7 /
Additional material For further informations on the analysis see the public web page: http://www-cdf.fnal.gov/physics/new/hdg//results_files/results/hwwmenn_068 M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 8 /
OS combined 95% C.L./σ SM 3 CDF Run II Preliminary - L = 5.9 fb OS Expected OS ± σ OS ± σ OS Observed Low M ll 95% C.L./σ SM CDF Run II Preliminary - L = 5.9 fb low M(ll) Expected low M(ll) ± low M(ll) ± σ σ low M(ll) Observed SS Standard Model 0 30 40 50 60 70 80 90 00 Higgs Mass (GeV) CDF Run II Preliminary - L = 5.9 fb SS + Jets Expected SS + Jets ± SS + Jets ± σ σ Standard Model 0 30 40 50 60 70 80 90 00 Higgs Mass (GeV) Trilepton CDF Run II Preliminary - L = 5.9 fb High Mass Expected High Mass ± High Mass ± σ σ 95% C.L./σ SM SS + Jets Observed 95% C.L./σ SM High Mass Observed Standard Model 0 30 40 50 60 70 80 90 00 Higgs Mass (GeV) Standard Model 0 30 40 50 60 70 80 90 00 Higgs Mass (GeV) M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 9 /
Tau 3 CDF Run II Preliminary - L = 5.9 fb Hsdronic Tau Expected Hsdronic Tau ± σ All channels CDF Run II Preliminary - L = 5.9 fb High Mass Expected High Mass ± σ Hsdronic Tau ± σ High Mass ± σ 95% C.L./σ SM Hsdronic Tau Observed 95% C.L./σ SM High Mass Observed Standard Model 0 30 40 50 60 70 80 90 00 Higgs Mass (GeV) Standard Model 0 30 40 50 60 70 80 90 00 Higgs Mass (GeV) Combined Limits High Mass 5 0 5 30 35 40 45 50 55 60 65 70 75 80 85 90 95 00 σ/σsm 9.85 5.3 3.34.9.69.34. 0.96 0.83 0.70 0.53 0.50 0.60 0.7 0.85.08.30.57.76 σ/σsm 3.78 7.4 4.69 3.3.38.90.58.35.5 0.98 0.73 0.70 0.83 0.99.8.53.86.3.45 Median/σSM 9.90.59 6.74 4.50 3.4.74.8.95.67.40.05.00.0.4.70.7.67 3.3 3.57 +σ/σsm 9.0 5.36 9.73 6.57 4.98 3.95 3.33.83.4.0.53.47.75.05.49 3.0 3.83 4.7 5.6 +σ/σsm 40.58.79 3.83 9. 6.95 5.50 4.6 3.99 3.40.86.4.07.48.90 3.55 4.5 5.55 6.67 7.35 Observed/σSM.98 3. 6.65 5.37 4. 3.3.68.3.5.74.3.08.8.54.4 3.57 3.3 4.79 5.4 M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 /
Data statistical fluctuation Upward fluctuation of the data is homogeneus in NN Output range M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 /
Exclusion sensitivity expectation This plot considers CDF sensitivity ( CDF+D0) M. Bauce (INFN Padova) Higgs searches at CDF Orsay, 9-3 July 0 /