ATLAS Violating CP Effectively
Supratim Das Bakshi, Joydeep Chakrabortty, Christoph Englert, Michael, Spannowsky, Panagiotis Stylianou

TL;DR
This paper investigates potential CP violation signals observed by ATLAS in Zjj production, explores their interpretation through vector-like leptons, and discusses future collider tests and constraints on new physics models.
Contribution
It offers a detailed analysis connecting ATLAS CP-violation hints to vector-like leptons and provides a comprehensive framework for future experimental validation.
Findings
ATLAS observed a local 95% CL excess in CP-sensitive observables.
Vector-like leptons can explain the hierarchy of CP-odd Wilson coefficients.
Future LHC high luminosity runs can test the proposed CP-violation scenario.
Abstract
CP violation beyond the Standard Model (SM) is a crucial missing piece for explaining the observed matter-antimatter symmetry in the Universe. Recently, the ATLAS experiment at the Large Hadron Collider has performed an analysis of electroweak production, thereby excluding the SM locally at 95\% confidence level in the measurement of CP-sensitive observables. We take the excess' interpretation in terms of anomalous gauge-Higgs interactions at face value and discuss further steps that are required to scrutinize its origin. In particular, we discuss the relevance of multi-boson production using adapted angular observables to show how they can be used to directly tension the reported excess in a more comprehensive analysis. To connect the excess to a concrete UV scenario for which the underlying assumptions of the analysis are valid, we identify vector-like leptons as a…
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