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Improved Measurements of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>-Violating Asymmetry Amplitudes in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Decays
We present updated measurements of the CP-violating parameters Sππ and Cππ in B0→π+π− decays. Using a sample of 227×106 Υ(4S)→BB¯ decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e− collider at SLAC, we observe 467±33 signal decays and measure Sππ=−0.30±0.17(stat)±0.03(syst) and Cππ=−0.09±0.15(stat)±0.04(syst).Received 28 January 2005DOI:https://doi.org/10.1103/PhysRevLett.95.151803©2005 American Physical Society