Measurement of the ω → π+ππ0 Dalitz plot distribution

WASA-at-COSY Collaboration

Результат исследования: Научные публикации в периодических изданияхстатья

5 Цитирования (Scopus)

Аннотация

Using the production reactions pd→He3ω and pp→ppω, the Dalitz plot distribution for the ω→π+ππ0 decay is studied with the WASA detector at COSY, based on a combined data sample of (4.408±0.042)×104 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 ϕ. For the first time, a deviation from pure P-wave phase space is observed with a significance of 4.1σ. The deviation is parametrised by a linear term 1+2αZ, with α determined to be +0.147±0.036, consistent with the expectations of ρ-meson-type final-state interactions of the P-wave pion pairs.

Язык оригиналаанглийский
Страницы (с-по)418-425
Число страниц8
ЖурналPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Том770
DOI
СостояниеОпубликовано - 10 июл 2017

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