Proton-Antiproton Annihilation in Baryonium

Abstract

A possible interpretation of the near-threshold enhancement in the $(p\bar{p})$-mass spectrum in $J/\psi \to \gamma p\bar{p}$ is the of existence of a narrow baryonium resonance X(1860). Mesonic decays of the $(p\bar{p})$-bound state X(1860) due to the nucleon-antinucleon annihilation are investigated in this paper. Mesonic coherent states with fixed $G$-parity and $P$-parity have been constructed . The Amado-Cannata-Dedoder-Locher-Shao formulation(Phys Rev Lett. {\bf 72}, 970 (1994)) is extended to the decays of the X(1860). By this method, the branch-fraction ratios of $Br(X\to \eta 4\pi )$, $Br(X\to \eta 2\pi )$ and $Br(X\to 3\eta )$ are calculated. It is shown that if the X(1860) is a bound state of $(p\bar{p})$, the decay channel ($X\to \eta 4\pi )$ is favored over $(X\to \eta 2\pi )$. In this way, we develop criteria for distinguishing the baryonium interpretation for the near-threshold enhancement effects in $(p\bar{p})$-mass spectrum in $J/\psi \to \gamma p\bar{p}$ from other possibilities. Experimental checks are expected. An intuitive picture for our results is discussed.

arXiv comment19 pages, 3 figures

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Cited by in corpus (42)

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• Study of J/psi->eta phi pi+pi- at BESIII
• 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
• The BESIII Physics Programme
• On the near-threshold $\bar{p}p$ invariant mass spectrum measured in $J/\psi$ and ${\psi }^{\prime }$ decays
• X(1835): A Natural Candidate of ${\eta }^{\prime }$'s Second Radial Excitation
• $X(1835)$ and $\eta (1760)$ observed by the BES Collaboration
• Study of Jψdecaying into ωp \bar p
• X(1835) as a baryonium state with QCD sum rules
• Near Threshold Enhancement of p pbar System and p pbar Elastic Scattering
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• Excited states of $\varphi$ meson
• Baryonia and near-threshold enhancements
• Baryonium, tetra-quark state and glue-ball in large N_c QCD
• $X(1835)$ and the New Resonances $X(2120)$ and $X(2370)$ Observed by the BES Collaboration
• Productions of X(1835) as baryonium with sizable gluon content
• Some properties of the newly observed X(1835) state at BES
• Observation of a structure at 1.84 GeV/c${}^2$ in the $3({\pi }^{+}{\pi }^{-})$ mass spectrum in $J/\psi \to \gamma 3({\pi }^{+}{\pi }^{-})$ decays
• What can we learn about light-meson interactions at electron-positron colliders?
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• X(1835), X(2120) and X(2370) in a flux tube model
• Rescattering Effect and Near Threshold Enhancement of $p\bar{p}$ System
• Studying $X(2100)$ hadronic decays and predicting its pion and kaon induced productions
• Interaction of real and virtual $p\bar{p}$ pairs in $J/\psi \to p\bar{p}\gamma (\rho ,\omega )$ decays
• Spectroscopy of ${\mathrm{q}}^3{\bar{\mathrm{q}}}^3$-States in Quark Model and Baryon-Antibaryon Enhancements
• Near threshold ppbar enhancement in the J/psi -> omega ppbar decay
• A possible mechanism for producing the threshold enhancement in $J/\psi \to \gamma p\bar{p}$
• Measurement of the Spin-Dependence of the pbar-p Interaction at the AD-Ring
• Analysis of the X(1835) and related baryonium states with Bethe-Salpeter equation
• Strong and Electromagnetic Decays of X(1835) as a Baryonium State
• Angular distributions in $J/\psi \to p\bar{p}{\pi }^0(\eta )$ decays
• QCD Exotics
• The proton-antiproton mass threshold structure in psi(3686) radiative decay revisited
• Reexamination of antinucleon-nucleon interactions in covariant chiral effective field theory
• Nonstrange baryonia
• Protonium: Discovery and Prediction
• Proposal of Direct Search for Strongly Bound States of ppbar, npbar Systems with High Intensity and Collective pbar beam
• Analysis of the $X(1835)$ as a baryonium state with Bethe-Salpeter equation
• Decay Widths of X(1835) as Nucleon-Antinucleon Bound State
• Baryons and baryoniums in the perspective of QCD sum rules