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Simulation-based inference in the search for CP violation in leptonic WH production

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arxiv 2308.02882 v2 pith:Y2HDQ4TF submitted 2023-08-05 hep-ph

Ricardo Barrué , Patricia Conde-Muíño , Valerio Dao , Rui Santos This is my paper
classification hep-ph
keywords effectiveobservableoperatoroptimalbeyondinferenceleadslimits
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Sources of CP violation beyond the Standard Model (BSM) are required to explain the baryonic asymmetry of the Universe. In this work, we study BSM CP-violating components in the HWW interaction in WH production, parametrized by an effective dimension-6 CP-odd operator. We explore a machine learning simulation-based inference method that estimates a detector-level optimal observable - SALLY - comparing it with energy-dependent and angular observables, exploring different binnings for their distributions. We show that in regions of phase space where the interference between SM and the effective operator dominates, a SALLY observable leads to optimal limits. In regions where effects of the quadratic term of the effective operator start becoming dominant, such an observable still leads to optimal limits. This work aims to test current multivariate techniques and inform analysis strategies for LHC Run 3 and beyond.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Combination of measurements of CP properties of Higgs boson interactions with vector bosons using proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

    hep-ex 2026-03 unverdicted novelty 6.0 of 10

    Combined ATLAS Higgs measurements find no CP violation and set the strongest simultaneous SMEFT limits on three CP-odd Wilson coefficients.

  2. Higgs Signal Strength Estimation with Machine Learning under Systematic Uncertainties

    hep-ph 2025-08 conditional novelty 6.0 of 10

    SAGE, a dual-branch GNN trained under nuisance fluctuations, estimates the Higgs signal strength with near-nominal coverage (0.662-0.683) but wider intervals than the top FAIR-HUC leaderboard methods.

  3. Proposed measurement of longitudinally polarised vector bosons in $WH$ and $ZH$ production at Hadron colliders

    hep-ph 2025-06 conditional novelty 6.0 of 10

    Simulation-based projections show longitudinally polarised W bosons in WH production could be measured at 5-sigma significance with 300 fb^-1 at the LHC.

  4. Unbinning global LHC analyses

    hep-ph 2025-09 conditional novelty 5.0 of 10

    Simulation-based inference produces stronger combined LHC constraints on SMEFT Wilson coefficients than histogram-based inference for four di-boson processes.

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