Enhanced CP violation in D 0→ρ 0(ω)ρ 0(ω)→π + π − π + π −
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In the factorization approach we study the direct CP violation in D 0→ρ 0(ω)ρ 0(ω)→π + π − π + π − (with unpolarized ρ 0(ω)) via the ρ−ω mixing mechanism. We find that the CP violation can be enhanced due to a large strong phase difference when the masses of the π + π − pairs are in the vicinity of the ω resonance. The CP violation parameter depends on the effective parameter N c which includes nonfactorizable effects and is determined by the experimental data. Taking into account double ρ−ω mixing contributions, we find the CP violating asymmetry is larger than these in the cases where no ρ−ω mixing or single ρ−ω mixing is taken into account. We also discuss the possibility to observe the predicted CP violation at BEPCII.
KeywordsCharm Quark Wilson Coefficient Isospin Violation Penguin Diagram Penguin Operator
This work was supported by National Natural Science Foundation of China (Project Numbers 11147003, 11047166, 11175020, 10975018, 11275025 and 11147197), the Special Grants (Project Number 2009BS028) for Ph.D. from Henan University of Technology, Plan For Scientific Innovation Talent of Henan University of Technology (Project Number 2012CXRC17) and the Fundamental Research Funds for the Central Universities in China.