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T: Fachverband Teilchenphysik

T 104: Jenseits des Standardmodells (Theorie) 3

T 104.7: Vortrag

Donnerstag, 27. März 2014, 18:15–18:30, P6

Effective field theory analysis of new physics in e⁺ e⁻ → W⁺ W⁻ — Gerhard Buchalla¹, Oscar Catà^1,2,3, •Rudi Rahn^1,4, and Matthias Schlaffer^1,5 — ¹Ludwig-Maximilians-Universität München — ²Technische Universität München, Garching — ³TUM-IAS, Garching — ⁴University of Oxford, Oxford, UK — ⁵DESY, Hamburg

We use a model-independent electroweak chiral Lagrangian to describe electroweak symmetry breaking, and include the next-to-leading order (NLO) effective operators arising as counterterms to describe new physics at the TeV scale. This Lagrangian is used to compute the NLO corrections to polarised e⁺ e⁻ → W⁺ W⁻ scattering. We find that only a subset of the available operators contributes corrections to the cross sections at all, and only a smaller subset contributes to leading order in a large-s expansion. An explanation by the Goldstone equivalence theorem is provided. Finally we discuss the absence of effects due to the physical Higgs scalar and present one possible UV theory as an example.