J/ψ→ωπ~+π~–衰变道中σ粒子存在的证据(英文)

  • based on a sample of 7.8×10 6 besi j/ψ events, the decay of j/ψ→ωπ +π – is studied. a low mass enhancement in the π +π – invariant mass spectrum recoiling against ω 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 σ particle. if a baeit–Winger function of constant width is used to fit the σ signal, its mass and width are 384±66 mev and 458±100 mev respectively, which correspond to the pole position at (434±78)–i(202±43) mev.particle, chiral particles, new resonance, j/ψ decay
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J/ψ→ωπ~+π~–衰变道中σ粒子存在的证据(英文)

Abstract: based on a sample of 7.8×10 6 besi j/ψ events, the decay of j/ψ→ωπ +π – is studied. a low mass enhancement in the π +π – invariant mass spectrum recoiling against ω 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 σ particle. if a baeit–Winger function of constant width is used to fit the σ signal, its mass and width are 384±66 mev and 458±100 mev respectively, which correspond to the pole position at (434±78)–i(202±43) mev.particle, chiral particles, new resonance, j/ψ decay

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