2005/09/30 by Xiao-Gang He, Xue-Qian Li, Xiang Liu +2
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-006-0129-y
published as Eur.Phys.J.C49:731-736,2007 · 13 pages, 3 figures. The final version to appear at EPJC
arxiv created 2006/09/28 · openalex publication_date 2006/11/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Recently the BES collaboration has announced observation of a resonant state in the π+π- η' spectrum in J/ψ→ γπ+π-η' decay. Fitting the data with a 0-+ state, the mass is determined to be 1833.7 MeV with 7.7σ statistic significance. This state is consistent with the one extracted from previously reported p p threshold enhancement data in J/ψ→ γp p. We study the properties of this state using QCD anomaly and QCD sum rules assuming X(1835) to be a pseudoscalar and show that it is consistent with data. We find that this state has a sizeable matrix element <0|G G|Gp> leading to branching ratios of (2.61∼ 7.37)× 10-3 and (2.21∼ 10.61)× 10-2 for J/ψ→ γGp and for Gp → π+π- η', respectively. Combining the calculated branching ratio of J/ψ→ γGp and data on threshold enhancement in J/ψ→ γp p, we determine the coupling for Gp- p- p interaction. We finally study branching ratios of other J/ψ→ γ+ three mesons decay modes. We find that J/ψ→ γGp → γ(π+π- η, K K π0) can provide useful tests for the mechanism proposed.