https://doi.org/10.1140/epjc/s10052-014-3140-8
Regular Article - Theoretical Physics
Direct CP violation in 
College of Nuclear Science and Technology, Beijing Normal University, Beijing, 100875, China
* e-mail: xhguo@bnu.edu.cn
Received:
4
August
2014
Accepted:
20
October
2014
Published online:
7
November
2014
We study the direct CP violation in the decay process in the standard model. An interesting mechanism involving the charge symmetry violating mixing between 
and 
is applied to enlarge the CP asymmetry. We find that the CP-violating asymmetry can be enhanced greatly via this 
– mixing mechanism when the invariant mass of the 
pair is in the vicinity of the resonance. With this mechanism, the maximum differential and localized integrated CP asymmetries can reach 
and 
, respectively, which is still negligible.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
