Tevatron Combination of SM Higgs Searches and Fourth Generation Limits Satish Desai – Fermilab For the CDF and DØ Collaborations 19 th International Conference.

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Presentation transcript:

Tevatron Combination of SM Higgs Searches and Fourth Generation Limits Satish Desai – Fermilab For the CDF and DØ Collaborations 19 th International Conference on Supersymmetry and Unification Of Fundamental Interactions

Tevatron Combined SM and 4th Gen Higgs Limits 2 Fits and Constraints M H < 158 GeV (indirect constraints) M H < 185 GeV (include LEP search) ● Electroweak symmetry breaking is a cornerstone of the standard model ● Higgs mechanism provides mass for the W and Z ● A consequence of this is the Higgs boson ● Mass is not predicted

Tevatron Combined SM and 4th Gen Higgs Limits fb -1 Delivered Recorded 11.7 fb -1 Today: Up to 8.6 fb -1

Tevatron Combined SM and 4th Gen Higgs Limits 4 Higgs Production and Decay ● For M H <≈ 135 GeV, H → bb dominates ● Control bg with leptons from associated W/Z

Tevatron Combined SM and 4th Gen Higgs Limits 5 Higgs Production and Decay ● For M H >≈ 135 GeV, H → WW dominates ● Control bg with leptons from W decays

Tevatron Combined SM and 4th Gen Higgs Limits 6 Leave No Higgs Behind

Tevatron Combined SM and 4th Gen Higgs Limits 7 Leave No Higgs Behind Many different channels from both CDF and DØ For more details, see talks by X. Bu, G. Facini, S. Shalhout, R. Nayyar

Tevatron Combined SM and 4th Gen Higgs Limits 8 Searching for H → WW (example) ● Exploit low S/B regions without diluting more senstive subsamples ● Selection defined by final state ● Train multivariate discriminants to extract more sensitvity

Tevatron Combined SM and 4th Gen Higgs Limits 9 Combined Discriminants M H : 115 GeV

Tevatron Combined SM and 4th Gen Higgs Limits 10 Combined Discriminants M H : 165 GeV

Tevatron Combined SM and 4th Gen Higgs Limits 11 Systematic Uncertainties ● Limits extracted using shape comparisons of final discriminant ● Important to consider ● Normalization uncertainties ● Shape uncertainties ● Track correlations across channel and experiment

Tevatron Combined SM and 4th Gen Higgs Limits 12 Getting the Results bins i Bayesian Method ● Use Bayesian method ● Use CLs as cross check ● Agree within 2% on average (at worst 10% depending on M H )

Tevatron Combined SM and 4th Gen Higgs Limits 13 The Log Likelihood Ratio LLR from CLs method

Tevatron Combined SM and 4th Gen Higgs Limits 14 Limits Excluded Regions: Observed: and GeV Expected: and GeV Limits at M H =115 GeV: Observed: 1.16 SM Expected: 1.17 SM

Tevatron Combined SM and 4th Gen Higgs Limits 15 Fourth Generation Models ● Additional quark loops enhance (gg→H) by factor of 9 ● Higgs mass up to 300 GeV allowed by indirect constraints ● Two scenarios based on mass of extra leptons ● Low mass exclusion: 124 – 286 GeV ● High mass exclusion: 124 – 300 GeV

Tevatron Combined SM and 4th Gen Higgs Limits 16 Looking to the Future Already recorded more than 10 fb - 1

Tevatron Combined SM and 4th Gen Higgs Limits 17 Summary ● We already exclude a significant part of the M H range allowed by electroweak fits ● Tevatron reaching sensitivity in dominant decay modes in the most interesting region ● Look forward to an exciting set of results in d0.fnal.gov/Run2Physics/WWW/results/higgs.htm cdf.fnal.gov/physics/new/hdg/hdg.html

Tevatron Combined SM and 4th Gen Higgs Limits 18 Summary ● We already exclude a significant part of the M H range allowed by electroweak fits ● Tevatron reaching sensitivity in dominant decay modes in the most interesting region ● Look forward to an exciting set of results in d0.fnal.gov/Run2Physics/WWW/results/higgs.htm cdf.fnal.gov/physics/new/hdg/hdg.html

Tevatron Combined SM and 4th Gen Higgs Limits 19 Backup Slides

Tevatron Combined SM and 4th Gen Higgs Limits 20 Between the High and the Low High mass channels from Moriond 2011 H → bb channels from EPS 2011 Sensitivity at M H = 135 GeV: 2.2 SM Sensitivity at M H = 135 GeV: 2.? SM

Tevatron Combined SM and 4th Gen Higgs Limits 21 The Big Picture

Tevatron Combined SM and 4th Gen Higgs Limits 22 1-CLs

Tevatron Combined SM and 4th Gen Higgs Limits 23 CLs