sin2phi2(alpha)) from Belle
Eunil Won
Abstract
We present a measurement of CP-violating asymmetries in B0 -> pi+pi- decays based on 41.8 fb-1 data sample collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we obtain the CP-violating asymmetry parameters Spipi = -1.21 + 0.38 - 0.27 (stat) + 0.16 - 0.13 (syst) and Apipi = +0.94 + 0.25 - 0.31 (stat) +- 0.09 (syst).
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