CP violation in loop-induced diboson production

TL;DR

This paper investigates how CP-violating interactions involving the Higgs and top quark affect diboson production via gluon fusion, analyzing differential distributions and decay angular correlations within the Standard Model Effective Field Theory.

Contribution

It provides a systematic study of CP-violating effects on diboson production and decay distributions, highlighting their potential observability and impact on gauge boson polarization.

Findings

CP-violating interactions alter angular distributions of decay products.

Differential distributions reveal signatures of CP violation in diboson production.

Polarization fractions are sensitive to CP-violating effects.

Abstract

We consider the impact of CP-violating Higgs and top interactions on diboson production from gluon fusion within the Standard Model Effective Field Theory framework. We systematically study differential distributions for double Higgs, double $W$ and $Z$ production and compare their features to those obtained from CP-conserving interactions. For electroweak gauge boson production, we explore the impact of the new interactions on the angular distributions of the leptonic decay products and the associated gauge boson polarisation fractions both inclusively and differentially with the transverse momentum of the gauge boson.