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Improved Measurements of CP-Violating Asymmetry Amplitudes in B0→π+π- Decays
- Aubert, B;
- Barate, R;
- Boutigny, D;
- Couderc, F;
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- et al.
Abstract
We present updated measurements of the CP-violating parameters Spipi and Cpipi in B0-->pi+pi- decays. Using a sample of 227x10(6) Upsilon(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 Spipi=-0.30+/-0.17(stat)+/-0.03(syst) and Cpipi=-0.09+/-0.15(stat)+/-0.04(syst).
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