Abstract
We study ππ correlations in the exclusive reactions pp → 2π +2π − and pp → 2π +2π −π 0 at rest with complete reconstruction of the kinematics for each event. A new analysis technique has been developed which is model independent. With this new technique, which relies on double-differential distributions, no reference sample is needed to extract the correlation signal. The correlations are studied as a function of the four-pion invariant mass.
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