NLO Inspired Effective Lagrangians for Higgs Physics

TL;DR

This paper discusses the use of effective Lagrangians with dimension-6 operators to analyze potential deviations in Higgs couplings from the Standard Model, especially in light of upcoming LHC data.

Contribution

It introduces a framework for incorporating higher-order corrections and local operators into Higgs physics analysis, connecting them with BSM theories and discussing their consistency.

Findings

Effective Lagrangians with dimension-6 operators can parameterize deviations in Higgs couplings.

The strategy includes using the full Standard Model with higher-order corrections supplemented by local operators.

Critical review of the internal consistency of the effective Lagrangian approach in Higgs physics.

Abstract

Either late autumn this year or latest early next year LHC should have results with 2-3 times the current data which migth give first clues on the couplings of the light narrow resonance. A strategy for measuring deviations from the Standard Model can be based on using the "full" Standard Model, including all available QCD and electroweak higher-order corrections, and supplement it with d= 6 local operators. Their Wilson coefficients are assumed to be small enough that they can be treated at leading order. Examples of the connection of local operators with BSM Lagrangians are presented as well as a discussion of Lagrangians with/without decoupling of heavy degrees of freedom. The whole strategy is critically reviewed in the light of internal consistency.