• Open Access

Machine-enhanced CP-asymmetries in the electroweak sector

Noah Clarke Hall, Isaac Criddle, Archie Crossland, Christoph Englert, Patrick Forbes, Robert Hankache, and Andrew D. Pilkington
Phys. Rev. D 107, 016008 – Published 18 January 2023

Abstract

The violation of charge conjugation (C) and parity (P) symmetries are a requirement for the observed dominance of matter over antimatter in the Universe. As an established effect of beyond the Standard Model physics, this could point towards additional CP violation in the Higgs-gauge sector. The phenomenological footprint of the associated anomalous couplings can be small, and designing measurement strategies with the highest sensitivity is therefore of the utmost importance in order to maximize the discovery potential of the Large Hadron Collider. There are, however, very few measurements of CP-sensitive observables in processes that probe the weak-boson self-interactions. In this article, we study the sensitivity to new sources of CP violation for a range of experimentally accessible electroweak processes, including Wγ production, WW production via photon fusion, electroweak Zjj production, electroweak ZZjj production, and electroweak W±W±jj production. We study simple angular observables as well CP-sensitive observables constructed using the outputs of machine-learning algorithms. We find that the machine-learning-constructed CP-sensitive observables improve the sensitivity to CP-violating effects by up to a factor of five, depending on the process. We also find that inclusive Wγ and electroweak Zjj production have the potential to set the best possible constraints on certain CP-odd operators in the Higgs-gauge sector of dimension-six effective field theories.

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  • Received 26 September 2022
  • Accepted 2 January 2023

DOI:https://doi.org/10.1103/PhysRevD.107.016008

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Noah Clarke Hall1, Isaac Criddle1, Archie Crossland1, Christoph Englert2,*, Patrick Forbes1, Robert Hankache1, and Andrew D. Pilkington1,†

  • 1Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
  • 2School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom

  • *christoph.englert@glasgow.ac.uk
  • andrew.pilkington@manchester.ac.uk

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Vol. 107, Iss. 1 — 1 January 2023

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