Contributions of interference and non-interference components to CP asymmetries in heavy meson decays
Abstract
In multi-body decays of heavy mesons, conventional CP asymmetry observables obtained by integrating over the full phase space are insensitive to the higher-order wave expansion contributions in the decay amplitude squared, and consequently fail to retain information on interference effects among different resonances. To overcome this limitation, one can introduce a phase-space partitioning scheme based on the zeros of Legendre polynomials, supplemented by a sign-function weighting procedure. On such a basis, two observables are defined, namely an asymmetry observable , and the corresponding CP asymmetry . We further separate the observables into interference and non-interference parts and analyze their respective roles. As an application, the decay channel are analyzed in the region near the resonance. Using the LHCb data, the results show that odd- schemes are particularly effective in isolating interference contributions, while even- schemes are more sensitive to non-interference terms. This new assignment scheme has the potential to be extended to other decay processes, thus enriching the available physical observables.
Keywords
Cite
@article{arxiv.2605.26480,
title = {Contributions of interference and non-interference components to CP asymmetries in heavy meson decays},
author = {Jing-Juan Qi and Yi-Fan Zhao and Jin-Xia Liu and Zhen-Hua Zhang and Xin-Heng Guo and Zhen-Yang Wang},
journal= {arXiv preprint arXiv:2605.26480},
year = {2026}
}