Enhanced CP violation in D0→ρ0(ω)ρ0(ω)→π+π−π+π−

被引：0
|
作者：
Gang Lü
Z.-H. Zhang
X.-H. Guo
Jun-Chao Lu
Shi-Ming Yan
机构：
[1] Henan University of Technology,College of Science
[2] University of South China,School of Nuclear Science and Technology
[3] Beijing Normal University,College of Nuclear Science and Technology
来源：
The European Physical Journal C | 2013年 / 73卷
关键词：
Charm Quark; Wilson Coefficient; Isospin Violation; Penguin Diagram; Penguin Operator;
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摘要：
In the factorization approach we study the direct CP violation in D0→ρ0(ω)ρ0(ω)→π+π−π+π− (with unpolarized ρ0(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 Nc 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.
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