In Perturbative QCD (PQCD) approach we study the direct CP violation in the pure annihilation decay process of Bˉs0→π+π−π+π− induced by the ρ and ω double resonance effect. Generally, the CP violation is small in the pure annihilation type decay process. However, we find that the CP violation can be enhanced by double ρ−ω interference when the invariant masses of the π+π− pairs are in the vicinity of the ω resonance. For the decay process of Bˉs0→π+π−π+π−, the maximum CP violation can reach 28.64{\%}.
@article{arxiv.1701.01966,
title = {$CP$ violation induced by the double resonance for pure annihilation decay process in Perturbative QCD},
author = {Gang Lü and Ye Lu and Sheng-Tao Li and Yu-Ting Wang},
journal= {arXiv preprint arXiv:1701.01966},
year = {2017}
}