1. 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, /16

2. 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, /16

3. 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, /16

4. 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, /16

5. 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, /16

6. 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, /16

7. 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, /16

8. 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, ]
MWTC is the most studied gauge theory on the Lattice after QCD
David Blaschke IFT Seminar, Uni Wroclaw, /16

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

10. 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, /16

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

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

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

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

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

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, /16