Searching for CP violation in Higgs interactions at the LHC is as challenging as it is important. Although modern machine learning outperforms traditional methods, its results are difficult to control and interpret, which is especially important if an unambiguous probe of a fundamental symmetry is required. We propose solving this problem by learning analytic formulas with symbolic regression. Using the complementary PySR and SymbolNet approaches, we learn CP-sensitive observables at the detector level for WBF Higgs production and top-associated Higgs production. We find that they offer advantages in interpretability and performance.
@article{arxiv.2507.05858,
title = {$\mathcal{CP}$-Analyses with Symbolic Regression},
author = {Henning Bahl and Elina Fuchs and Marco Menen and Tilman Plehn},
journal= {arXiv preprint arXiv:2507.05858},
year = {2025}
}