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- W2146458990 abstract "We report the first observation of CP violation in B0→π+π− decays based on 152×106 ϒ(4S)→BB¯ decays collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. We reconstruct a B0→π+π− CP eigenstate and identify the flavor of the accompanying B meson from its decay products. From the distribution of the time intervals between the two B meson decay points, we obtain Aππ=+0.58±0.15(stat)±0.07(syst) and Sππ=−1.00±0.21(stat)±0.07(syst). We rule out the CP-conserving case, Aππ=Sππ=0, at a level of 5.2 standard deviations. We also find evidence for direct CP violation with a significance at or greater than 3.2 standard deviations for any Sππ value.Received 18 January 2004DOI:https://doi.org/10.1103/PhysRevLett.93.021601©2004 American Physical Society" @default.
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