Constraining CP violating operators in charged and neutral triple gauge couplings

Anke Biekötter,Parisa Gregg,Frank Krauss,Marek Schönherr

doi:10.1016/j.physletb.2021.136311

Anke Biekötter, Parisa Gregg + Show 2 more

Open Access

https://doi.org/10.1016/j.physletb.2021.136311

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Journal: Physics Letters B	Publication Date: Apr 22, 2021
Citations: 61	License type: cc-by

Affiliation: Durham University

Abstract

We constrain CP-violating charged and neutral anomalous triple gauge couplings using LHC measurements and projections of diboson and VBF Vjj production, both with subsequent leptonic decays. For triple gauge couplings involving W bosons we analyse differential asymmetries and interpret our results in the SMEFT at dimension-six. For neutral triple gauge couplings, which are dominantly constrained by high transverse-momentum bins, we present the resulting bounds in terms of a general anomalous couplings framework.

Highlights

The observation of the Higgs boson in 2012 [1,2] has been a milestone in the confirmation of electroweak symmetry breaking (EWSB)
Due to the dominance of squared neutral triple gauge coupling contributions compared to the polarization-suppressed interference with the Standard Model (SM) [25,35,36], we investigate their effects on the cross section in the high-pT regime, rather than studying asymmetries
We have studied the constraints on CP -odd anomalous triple gauge couplings from diboson production

Summary

Introduction

The observation of the Higgs boson in 2012 [1,2] has been a milestone in the confirmation of electroweak symmetry breaking (EWSB). To describe small deviations from the Standard Model (SM) values of the charged TGCs in a model-independent fashion, we will use the language of Standard Model Effective Field Theory (SMEFT) [13,14,15,16,17], where CP -odd SMEFT operators influencing the charged TGCs appear at dimension six Constraints on these operators have been studied and constrained in Higgs boson [18,19,20,21,22,23] and diboson production processes [24,25,26,27,28] as well as vector boson scattering [29]. Due to the dominance of squared neutral triple gauge coupling (nTGC) contributions compared to the polarization-suppressed (linear) interference with the SM [25,35,36], we investigate their effects on the cross section in the high-pT regime, rather than studying asymmetries

Charged aTGC

Neutral aTGCs

Findings

Conclusions and outlook