Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5494858 | Physics Letters B | 2017 | 8 Pages |
Abstract
Using the production reactions pdâHe3Ï and ppâppÏ, the Dalitz plot distribution for the ÏâÏ+ÏâÏ0 decay is studied with the WASA detector at COSY, based on a combined data sample of (4.408±0.042)Ã104 events. The Dalitz plot density is parametrised by a product of the P-wave phase space and a polynomial expansion in the normalised polar Dalitz plot variables Z and Ï. For the first time, a deviation from pure P-wave phase space is observed with a significance of 4.1Ï. The deviation is parametrised by a linear term 1+2αZ, with α determined to be +0.147±0.036, consistent with the expectations of Ï-meson-type final-state interactions of the P-wave pion pairs.
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