Effect of sigma(600)-Production in pp_bar to 3pi0 at rest
Muneyuki Ishida (TItech), Toshihiko Komada (Nihon univ.), Shin Ishida, (Nihon univ.), Taku Ishida (KEK), Kunio Takamatsu (Miyazaki univ.) and, Tsuneaki Tsuru (KEK)
TL;DR
This paper reanalyzes pp_bar to 3pi0 at rest data, demonstrating that including sigma(600) production improves the fit to pi0 pi0 mass spectra and angular distributions near KK_bar threshold and at 1.5 GeV.
Contribution
It introduces a new analysis method consistent with unitarity, directly expressed by resonance parameters, to better understand sigma-meson production effects.
Findings
Sigma(600) production improves fit quality
Light sigma-meson effects are clearly observed
Analysis method aligns with unitarity principles
Abstract
The pi0 pi0 mass spectra and angular distributions around KK_bar-threshold and at 1.5 GeV in pp_bar(at rest) to 3pi0 in the Crystal Barrel experiment are reanalyzed by applying the new method, which is consistent with unitarity of S-matrix and expressed directly by resonance parameters. The effects of light sigma-meson production are clearly seen to improve the fit with sigma, in comparing with the fit without sigma.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Particle Accelerators and Free-Electron Lasers