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arxiv: 1110.0694 · v2 · submitted 2011-10-04 · ✦ hep-ex

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Search for CP Violation in D Meson Decays to phi pi+

Belle Collaboration: M. Stari\v{c} , H. Aihara , K. Arinstein , D. M. Asner , T. Aushev , A. M. Bakich , A. Bay , V. Bhardwaj
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classification ✦ hep-ex
keywords decaysviolationcabibbo-suppressedk-pimesonsearchasymmetriesbelle
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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.

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