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The fate of / 24 Little Higgs models with LHC Run 2 data Jrgen R. Reuter, DESY based on work with D. Dercks, G. Moortgat-Pick, S. Y. Shim, M. Tonini, M. de Vries tbp JHEP [1801.08034], JHEP 1402(14) 053 [1310.2918], US Snowmass Summer

  1. The fate of / 24 Little Higgs models with LHC Run 2 data Jürgen R. Reuter, DESY based on work with D. Dercks, G. Moortgat-Pick, S. Y. Shim, M. Tonini, M. de Vries tbp JHEP [1801.08034], JHEP 1402(14) 053 [1310.2918], US Snowmass Summer Study 1307.5010, JHEP 1302(13) 077 [1212.5930], PRD 74(06) 095003 [hep-ph/0609119], PRD 71(05)015008 [hep-ph/0411213], PRD 70(04) 015004 [hep-ph/0311095] J.R.Reuter LTP model and LHC Run 2 data Seminar, Grenoble, 21.03.2018 1

  2. The Little Big Higgs boson 2 / 24 • Discovery of a light Higgs boson leaves still open questions: 1. Nature of Electroweak Symmetry Breaking 2. Higgs boson potential, all the way like the Standard Model!? 3. Does it fulfill the US-fermion/Europe-boson rule? 4. Is the 125 GeV state the only resonance in the system of EW vector bosons? 5. Is there something related to the Little Hierarchy problem (strong or weak) J.R.Reuter LTP model and LHC Run 2 data Seminar, Grenoble, 21.03.2018

  3. Higgs as pNGB & Collective Symmetry Breaking 3 / 24 Old Idea: Light Higgs as a (pseudo-) Nambu-Goldstone boson of a spontaneously broken symmetry [Georgi/Pais, ’75; Georgi/Kaplan, ’84] Analogy: chiral symmetry breaking in QCD J.R.Reuter LTP model and LHC Run 2 data Seminar, Grenoble, 21.03.2018

  4. Higgs as pNGB & Collective Symmetry Breaking 3 / 24 Old Idea: Light Higgs as a (pseudo-) Nambu-Goldstone boson of a spontaneously broken symmetry [Georgi/Pais, ’75; Georgi/Kaplan, ’84] Analogy: chiral symmetry breaking in QCD Upscale: Technicolor (ruled out by EWPO/LHC) J.R.Reuter LTP model and LHC Run 2 data Seminar, Grenoble, 21.03.2018

  5. Higgs as pNGB & Collective Symmetry Breaking 3 / 24 Old Idea: Light Higgs as a (pseudo-) Nambu-Goldstone boson of a spontaneously broken symmetry [Georgi/Pais, ’75; Georgi/Kaplan, ’84] Analogy: chiral symmetry breaking in QCD Upscale: Technicolor (ruled out by EWPO/LHC) Collective Symmetry Breaking: 3-scale model Arkani-Hamed/Cohen/Georgi, ’01 Arkani-Hamed/Cohen/Gregoire/Wacker, ‘02 J.R.Reuter LTP model and LHC Run 2 data Seminar, Grenoble, 21.03.2018

  6. Characteristics and Spectra 4 / 24 Extended global symmetry Radiative symmetry breaking (Coleman-Weinberg) Specific form of scalar potential Extended gauge symmetry New heavy gauge bosons New heavy (vector-like) fermions J.R.Reuter LTP model and LHC Run 2 data Seminar, Grenoble, 21.03.2018

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