On model-independent searches for direct CP violation in multi-body decays

TL;DR

This paper discusses advanced model-independent methods for detecting direct CP violation in multi-body decays, comparing approaches, optimizing techniques, and extending tests to P-odd violations, including GPU implementation.

Contribution

It introduces a new approach for testing P-odd CP violation and evaluates the energy test's performance with background and GPU acceleration.

Findings

Energy test performance optimized and compared

New method for P-odd CP violation testing proposed

GPU implementation enhances computational efficiency

Abstract

Techniques for performing model-independent searches for direct CP violation in three and four-body decays are discussed. Comments on the performance and the optimisation of a binned chisquare approach and an unbinned approach, known as the energy test, are made. The use of the energy test in the presence of background is also studied. The selection and treatment of the coordinates used to describe the phase-space of the decay are discussed. The conventional model-independent techniques, which test for P-even CP violation, are modified to create a new approach for testing for P-odd CP violation. An implementation of the energy test using GPUs is described.