1203.6409 (B. R. Ko et al.)

Evidence for CP Violation in the Decay $D^+\rightarrow K^0_Sπ^+$    [PDF]

B. R. Ko, E. Won for the Belle Collaboration

We observe evidence for CP violation in the decay $D^+\rightarrow K^0_S\pi^+$ using a data sample with an integrated luminosity of 977 fb$^{-1}$ collected by the Belle detector at the KEKB $e^+e^-$ asymmetric-energy collider. The CP asymmetry in the decay is measured to be $(-0.363\pm0.094\pm0.067)%$, which is 3.2 standard deviations away from zero, and is consistent with the expected CP violation due to the neutral kaon in the final state.

View original: http://arxiv.org/abs/1203.6409