Measurement of the ω → π+ππ0 Dalitz plot distribution

The WASA-at-COSY Collaboration

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)418-425
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume770
DOIs
Publication statusPublished - 10 Jul 2017

Keywords

  • Decays of other mesons
  • Light mesons
  • Meson–meson interactions
  • MU(+)MU(-)GAMMA
  • TRANSITION FORM-FACTORS
  • DETECTOR
  • NA60
  • LIGHT VECTOR-MESONS
  • DECAYS
  • Meson-meson interactions
  • PI-PI-SCATTERING
  • DISPERSIVE ANALYSIS
  • ETA
  • PARITY

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