J. Stefan Institute, Ljubljana.
Phys Rev Lett. 2012 Feb 17;108(7):071801. doi: 10.1103/PhysRevLett.108.071801. Epub 2012 Feb 13.
We search for CP violation in Cabibbo-suppressed charged D meson decays by measuring the difference between the CP-violating asymmetries for the Cabibbo-suppressed decays D(±)→K(+)K(-)π(±) and the Cabibbo-favored decays D(s)(±)→K(+)K(-)π(±) in the K(+)K(-) mass region of the ϕ resonance. Using 955 fb(-1) of data collected with the Belle detector, we obtain A(CP)(D+→ϕπ+)=(+0.51±0.28±0.05)%. The measurement improves the sensitivity of previous searches by more than a factor of 5. We find no evidence for direct CP violation.
我们通过测量在 φ 共振区的 K(+)K(-) 质量区域中 Cabibbo 压制的 D(±)→K(+)K(-)π(±)衰变与 Cabibbo favored 的 D(s)(±)→K(+)K(-)π(±)衰变之间的 CP 破坏不对称性的差异，来寻找 Cabibbo 压制的带电 D 介子衰变中的 CP 破坏。使用 Belle 探测器收集的 955 fb(-1)数据，我们得到 A(CP)(D+→ϕπ+)=(+0.51±0.28±0.05)％。该测量通过超过 5 倍的因子提高了先前搜索的灵敏度。我们没有发现直接 CP 破坏的证据。
