Search for CP Violation in D Meson Decays to phi pi+
  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-pi+ and the Cabibbo-favored decays Ds -> K+K-pi+ in the K+K- mass region of the phi resonance. Using 955/fb of data collected with the Belle detector we obtain A_CP(D+ -> phi pi+) = (+0.51 +- 0.28 +- 0.05)%. The measurement improves the sensitivity of previous searches by more than a factor of five. We find no evidence for direct CP violation. 
Belle Collaboration: M. Stari\v{c}, H. Aihara, K. Arinstein, D. M.   Asner, T. Aushev, A. M. Bakich, A. Bay, V. Bhardwaj, B....
hep-ex