Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-07-07
Phys.Rev. D71 (2005) 014031
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex 10 pages, no figures, typos corrected
Scientific paper
10.1103/PhysRevD.71.014031
We study the threshold enhancement effects of baryon-anti-baryon systems in $J/\psi$ decays at BES using parity $P$, charge conjugation $C$, and flavor SU(3) symmetries. The $P$ and $C$ symmetries restrict the $p\bar p$ in $J/\psi \to \gamma p\bar p$ to be in a state with $C=+1$, while the $p\bar p$ in $J/\psi \to \pi^0 p\bar p$ to be with $C=-1$. Combining the $C$ and $P$ symmetries with flavor SU(3) symmetry, i.e. the CPS symmetry, we find that the $\Lambda \bar p$ system cannot be in $0^+$ and $0^-$ states in $J/\psi \to K^+ \Lambda \bar p$. We provide a consistent explanation of observation and non-observation of near threshold enhancements in $J/\psi \to K^+ \Lambda \bar p$ and $J/\psi \to \pi^0 p \bar p$, respectively. We also find that near baryon pair threshold enhancement can happen in several channels for $J/\psi$ decays and can be several times larger than that observed in $J/\psi \to K^+ \Lambda \bar p$ in some channels.
He Xiao-Gang
Li Xue-Qian
Ma Jian-Ping
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