Das Bakshi, S., Chakrabortty, J., Englert, C. , Spannowsky, M. and Stylianou, P. (2021) CP violation at ATLAS in effective field theory. Physical Review D, 103(5), 055008. (doi: 10.1103/PhysRevD.103.055008)
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Abstract
CP violation beyond the Standard Model (SM) is a crucial missing piece for explaining the observed matter-antimatter asymmetry in the Universe. Recently, the ATLAS experiment at the Large Hadron Collider has performed an analysis of electroweak Z j j 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 Z j j excess in a more comprehensive analysis. To connect the excess to a concrete UV scenario for which the underlying assumptions of the Z j j analysis are valid, we identify vector-like leptons as a candidate theory consistent with the observed CP-odd Wilson coefficient hierarchy observed by ATLAS. We perform a complete one-loop matching calculation to motivate further model-specific and correlated new physics searches. In parallel, we provide estimates of the sensitivity reach of the LHC’s high luminosity phase for this particular scenario of CP-violation in light of electroweak precision and Run-2 Higgs data. These provide strong constraints on the model’s CP-even low-energy phenomenology, but also inform the size of the CP-odd SM deformation indirectly via our model hypothesis.
| Item Type: | Articles |
|---|---|
| Additional Information: | The work of S.D.B. and J.C. is supported by the Science and Engineering Research Board, Government of India, under the agreements SERB/PHY/2016348 (Early Career Research Award) and SERB/PHY/2019501 (MATRICS). C.E. is supported by the UK Science and Technology Facilities Council (STFC) under grants ST/P000746/1 and ST/T000945/1 and by the IPPP Associateship Scheme. M.S. is supported by the STFC under grant ST/P001246/1. P.S. is supported by an STFC studentship under grant ST/T506102/1. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Stylianou, Mr Panagiotis and Englert, Professor Christoph |
| Authors: | Das Bakshi, S., Chakrabortty, J., Englert, C., Spannowsky, M., and Stylianou, P. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Journal Name: | Physical Review D |
| Publisher: | American Physical Society |
| ISSN: | 2470-0010 |
| ISSN (Online): | 2470-0029 |
| Copyright Holders: | Copyright © 2021 The Authors |
| First Published: | First published in Physical Review D 103(5):055008 |
| Publisher Policy: | Reproduced under a Creative Commons licence |
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