Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 104: Jenseits des Standardmodells (Theorie) 3

T 104.6: Talk

Thursday, March 27, 2014, 18:00–18:15, P6

Higgs beyond the Standard Model - an EFT approach — •Claudius Krause¹, Gerhard Buchalla¹, and Oscar Catà^1,2,3 — ¹Ludwig-Maximilians-Universität München, Arnold Sommerfeld Center for Theoretical Physics, D-80333 München — ²Physik Department, TUM, D-85748 Garching — ³TUM-IAS, Lichtenbergstr. 2a, D-85748 Garching

We consider the Standard Model as a low-energy effective description of a new, strong interaction. This generic interaction breaks the electroweak symmetry dynamically at the scale Λ 4π v of a few TeV. The Higgs boson arises as a composite pseudo-Nambu-Goldstone boson in these scenarios and is therefore naturally light. We discuss what assumptions are used in the leading order Lagrangian, which is in general non-renormalizable. Also, we explain what systematics governs the effective expansion. We develop a power-counting formula and show its relation to naive dimensional analysis (NDA) and to the counting of chiral dimensions. Afterwards, we derive all the operators at next-to-leading order (O(v² / Λ²)≃ O(1/16π²)) in the effective expansion. Some applications of this framework are also discussed.