Observation of large CP violation and evidence for direct CP violation in B0 → π+ π- decays
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Abe, K
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The statistical errors are reduced by about a factor of two due to the increase in the data sample (0.75), the improvement in signal yield extraction (0.90) and continuum rejection (0.95), the use of a more accurate signal fraction (0.93), and other effects (0.93). The values in parentheses are the expected reduction factors.
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max is now nearly parabolic, and the sensitivity to a large single event fluctuation [5] is greatly reduced
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