Details

Autor(en) / Beteiligte

• Trott, Michael

Titel

On the consistent use of constructed observables

Ist Teil von

• The journal of high energy physics, 2015-02, Vol.2015 (2), p.1, Article 46

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• A bstract We define “constructed observables” as relating experimental measurements to terms in a Lagrangian while simultaneously making assumptions about possible deviations from the Standard Model (SM), in other Lagrangian terms. Ensuring that the SM effective field theory (EFT) is constrained correctly when using constructed observables requires that their defining conditions are imposed on the EFT in a manner that is consistent with the equations of motion. Failing to do so can result in a “functionally redundant” operator basis (We define the concept of functional redundancy, which is distinct from the usual concept of an operator basis redundancy, in the introduction.) and the wrong expectation as to how experimental quantities are related in the EFT. We illustrate the issues involved considering the S parameter and the off shell triple gauge coupling (TGC) verticies. We show that the relationships between h → V f ¯ f decay and the off shell TGC verticies are subject to these subtleties, and how the connections between these observables vanish in the limit of strong bounds due to LEP. The challenge of using constructed observables to consistently constrain the Standard Model EFT is only expected to grow with future LHC data, as more complex processes are studied.