Returning CP-Observables to The Frames They Belong

Abstract

Optimal kinematic observables are often defined in specific frames and then approximated at the reconstruction level. We show how multi-dimensional unfolding methods allow us to reconstruct these observables in their proper rest frame and in a probabilistically faithful way. We illustrate our approach with a measurement of a CP-phase in the top Yukawa coupling. Our method makes use of key advantages of generative unfolding, but as a constructed observable it fits into standard LHC analysis frameworks.

25 pages, 7 figures

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• Differentiable MadNIS-Lite
• Anomaly detection with flow-based fast calorimeter simulators
• CaloChallenge 2022: A Community Challenge for Fast Calorimeter Simulation
• Higher-Order Corrections to Quantum Observables in $h\to W{W}^{\ast }$
• Generative Unfolding with Distribution Mapping
• Unifying Simulation and Inference with Normalizing Flows
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• Sensitivity to $\mathcal{C}\mathcal{P}$-violating effective couplings in the top-Higgs sector
• Extrapolating Jet Radiation with Autoregressive Transformers
• How to Unfold Top Decays
• Tools for Unbinned Unfolding