Evidence of $σ$ particle in $J/ψ\to ωππ$

Details Evidence of $σ$ particle in $J/ψ\to ωππ$ Evidence of $σ$ particle in $J/ψ\to ωππ$

2004-04-12

arxiv.org/abs/hep-ex/0404016v1

High Energy Phys.Nucl.Phys. 28 (2004) 215-221

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 7 figures

Scientific paper

Based on a sample of 7.8 million BESI $J/\psi$ events, the decay of $ J/\psi \to \omega \pi^+ \pi^-$ is studied. A low mass enhancement in the $\pi^+ \pi^-$ invariant mass spectrum recoiling against $\omega$ particle is clearly seen which does not come from the phase space effect and the background. According to PWA analysis, this low mass enhancement is a broad $0^{++}$ resonance, the $\sigma$ particle. If a Breit-Winger function of constant width is used to fit the $\sigma$ signal, its mass and width are $384 \pm 66$ MeV and $458 \pm 100$ MeV respectively, which correspond to the pole position at (434 $\pm$ 78) - $i$ (202 $\pm$ 43) MeV.

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