The Higgs – A fundamental particle?

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Presentation transcript:

The Higgs – A fundamental particle? Kibble Hagen Brout Introduction Standard Model Higgs Boson Composite Scalar – σ Model from NJL model Top quark condensate? Technicolor? Extra Dimensions? Summary Higgs Guralnik Englert David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 1/16

The Higgs – discovered at CERN-LHC? Spin 1 is excluded by H → 2 gamma Spin 0 (scalar) or Spin 2 (tensor) possible David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 2/16

Higgs – production and decay channels Spin 1 is excluded by H → 2 gamma Spin 0 (scalar) or Spin 2 (tensor) possible David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 3/16

The Standard Model Higgs Boson Higgs field is a four-component scalar Field that forms a complex doublet Higgs part of SM Lagrangian Measured value v=246 GeV/c2 Gives mass to W and Z And via Yukawa couplings to quarks and leptons David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 4/16

The Higgs – A fundamental particle? SU(2) SU(3) Higgs = the only scalar elementary boson? Origin? Not a gauge boson? Composite? David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 5/16

The Higgs – A fundamental particle? SU(2) SU(3) Higgs = the scalar field which fills the Universe and makes up “Dark Energy” ? David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 6/16

The Higgs – A composite scalar meson? Paradigm: Nambu—Jona-Lasinio model → sigma model [Klevansky (1992) RMP 64] Hubbard-Strat. Bosonization Reproduces the sigma-model Lagrangian [Eguchi (1976) PRD 14, 2755] NJL model for Higgs as tt bound state [Bardeen, Hill, Lindner (1990) PRD 41, 1647] David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 7/16

The Higgs – A composite scalar ? 1 extra family of (techni-) quarks Interacting via SU(2) technicolor 1 extra family of leptons Higgs = scalar composite Extra Electron Original Technicolor (TC) idea: [Weinberg (1979) PRD 19] and [Susskind (1979) PRD 20] Modern TC for LHC: Minimal Walking TC [Sannino & Tuominen (2004) PRD 71, 051901] MWTC is the most studied gauge theory on the Lattice after QCD David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 8/16

Walking F. Sannino: Plenary talk at “Confinement X”, Munich, October 7-12, 2012 David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 9/16

Condensate Enhancement F. Sannino: Plenary talk at “Confinement X”, Munich, October 7-12, 2012 QCD: chiral condensate <uu> = - (240 MeV)3 scalar (sigma) meson f0(500) as light quark-antiquark bound state David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 10/16

The Technicolor Higgs David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 11/16

Geometric Light TC Higgs David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 12/16

Walking Light TC Higgs David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 13/16

Minimal TC states to discover ! David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 14/16

Associate Production of the Higgs David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 15/16

Summary - Candidate for Higgs boson (Higgson) found at CERN-LHC (ATLAS, CMS) with a mass between 125 – 127 GeV/c2 - Question about its nature: fundamental or composite? - Minimal Walking Technicolor models with one extra family of TC quarks (and extra leptons) and SU(2) TC gluons predicts a composite Higgs in the right mass range - Testable predictions for new TC axialvector bosons at LHC - New era for nonperturbative strong dynamics ! David Blaschke IFT Seminar, Uni Wroclaw, 26.10.2012 16/16