Wuppertal 2015 – scientific programme
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T: Fachverband Teilchenphysik
T 78: BSM Higgs (Theorie)
T 78.2: Talk
Wednesday, March 11, 2015, 17:00–17:15, K.11.07
Higgs beyond the Standard Model - an EFT approach — Gerhard Buchalla, Oscar Catà, and •Claudius Krause — Ludwig-Maximilians-Universität München, Fakultät für Physik, Arnold Sommerfeld Center for Theoretical Physics, D–80333 München, Germany
We consider the Standard Model as an effective field theory (EFT) at the electroweak scale v. At the scale f≥ v we assume a new, strong interaction that breaks the electroweak symmetry dynamically. The Higgs boson arises as a composite pseudo-Nambu-Goldstone boson in these scenarios and is therefore naturally light (mh∼ v). Depending on the value of ξ=v2/f2, different expansions of the EFT can be used. For ξ=O(1) the electroweak chiral Lagrangian should be used and the effective theory is given by a loop expansion (similar to chiral perturbation theory). In the decoupling limit, ξ→ 0, an expansion in canonical dimension is recovered.
In this talk I will briefly explain the systematics of these two different regimes of the EFT and then focus on the case where ξ is small but non-zero. It leads to a double expansion in ξ and 1/16π2, which captures the expected corrections of a strongly-interacting light Higgs to the Standard Model in a systematic way.