Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 47: Higgs-Boson (Eigenschaften) (theo.+exp.)

T 47.1: Talk

Tuesday, March 1, 2016, 16:45–17:00, VMP5 HS B1

QFT justification of the κ-framework using the electroweak chiral Lagrangian — Gerhard Buchalla, Oscar Catà, Alejandro Celis, and •Claudius Krause — Ludwig-Maximilians-Universität München, Fakultät für Physik, Arnold Sommerfeld Center for Theoretical Physics, D-80333 München, Germany

We consider the electroweak chiral Lagrangian as effective field theory (EFT) for the Standard Model at the electroweak scale v. This EFT describes the phenomenology of the Standard Model with generalized Higgs couplings in a consistent way. This is motivated by (but not restricted to) a new, strongly-coupled sector responsible for electroweak symmetry breaking.

After a brief discussion of the systematics of the effective expansion, I will present its application to current LHC Higgs data. I will show how the leading effects are related to the κ-framework that is currently used by the experiments at the LHC. The κ-framework was introduced as a pure phenomenological signal-strength parametrization and is criticized as being inconsistent with quantum field theory. I will show that the latter is not the case and present a justification of the κ-framework using the leading order analysis of the electroweak chiral Lagrangian. It is therefore well defined and can straightforwardly be extended to higher orders within the EFT. I will also present a fit of the chiral Lagrangian to the LHC Higgs data.