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

Chris Parkes, Shanzhen Chen, Jolanta Brodzicka, Marco Gersabeck

Published 2016-12-14Version 1

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 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.