Evidence of κ particle in J/ψ→ K^*(892)⁰ K⁺ π^-

2003/04/01 by J.Z. Bai, J. Z. Bai, Hao Zheng +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/0304001

4 pages, 4 figures

openalex publication_date 2003/04/01 · arxiv created 2003/04/07 · arxiv updated 2009/11/30 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

Based on a J/ψ data sample of 7.8 × 10⁶ events at BESI, the decay of J/ψ→ K^*(892)⁰ K⁺ π^- is studied and a low mass enhancement, which is believed not coming from the phase space effect or background, is visible in the K⁺ π^- invariant mass spectrum recoiling against K^*(892)⁰. Partial wave analysis of this channel favors this low mass enhancement being a broad 0⁺ resonance with the mass and width of 771⁺¹⁶⁴_-221± 55 MeV/c² and 220⁺²²⁵_-169 ± 97 MeV/c², respectively.

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