Understanding the Possible Proton Antiproton Bound State Observed by BES Collaboration

Abstract

We comment on the quantum numbers and decay channels of the possible proton antiproton bound state observed by BES Collaboration. Based on the general symmetry consideration and available experimental information, we conclude that the quantum number of this state is very likely to be $J^{PC}=0^{-+},I^G=0^{+}$, which can not decay into final states ${\pi }^{+}{\pi }^{-},2{\pi }^0,K\bar{K},3\pi$. Besides its dissociation into $p\bar{p}$, the other important mesonic decay modes could be $\eta \pi \pi$, ${\eta }^{\prime }\pi \pi$, $\eta \eta \eta$, $4\pi$, $K\bar{K}\pi$, $\eta K\bar{K}$, $K\bar{K}\pi \pi$, 6$\pi$. Experimental search of this signal in these meson final states is strongly called for.

Cited by in corpus (20)

• The hidden-charm pentaquark and tetraquark states
• Observation of a resonance X(1835) in J/ψ--> γπ^+ π^- η^{\prime}
• New Hadron States
• Antiproton-Proton Channels in J/psi Decays
• Proton-Antiproton Annihilation in Baryonium
• Study of J/psi->eta phi pi+pi- at BESIII
• Categorizing resonances X(1835), X(2120) and X(2370) in the pseudoscalar meson family
• Radiative Decays of the Upsilon(1S) to a Pair of Charged Hadrons
• Observation of a ppb mass threshoud enhancement in ψ^\prime\toπ^+π^-J/ψ(J/ψ\toγp\bar{p}) decay
• X(1835): A Natural Candidate of ${\eta }^{\prime }$'s Second Radial Excitation
• Study of Jψdecaying into ωp \bar p
• X(1835): A Possible Baryonium?
• Baryonia and near-threshold enhancements
• Baryonium, tetra-quark state and glue-ball in large N_c QCD
• Study of $J/\psi \to \omega p\bar{p}$ at BESIII
• X(1835), X(2120) and X(2370) in a flux tube model
• Parity, Charge Conjugation and SU(3) Constraints on Threshold Enhancement in $J/\psi$ decays into $\gamma p\bar{p}$ and $Kp\bar{\Lambda }$
• Baryon Antibaryon Nonets
• RPA Vector Meson Leptonic Widths
• Baryons and baryoniums in the perspective of QCD sum rules