On the near-threshold $\bar{p}p$ invariant mass spectrum measured in $J/\psi$ and ${\psi }^{\prime }$ decays

Abstract

A systematic analysis of the near-threshold enhancement in the $\bar{p}p$ invariant mass spectrum seen in the decay reactions $J/\psi \to x\bar{p}p$ and $\psi (3686)\to x\bar{p}p$ $(x=\gamma ,\omega ,\rho ,\pi ,\eta )$ is presented. The enhancement is assumed to be due to the $\bar{N}N$ final-state interaction (FSI) and the pertinent FSI effects are evaluated in an approach that is based on the distorted-wave Born approximation. For the $\bar{N}N$ interaction a recent potential derived within chiral effective field theory and fitted to results of a partial-wave analysis of $\bar{p}p$ scattering data is considered and, in addition, an older phenomenological model constructed by the Jülich group. It is shown that the near-threshold spectrum observed in various decay reactions can be reproduced simultaneously and consistently by our treatment of the $\bar{p}p$ FSI. It turns out that the interaction in the isospin-1 ${}^1{S}_0$ channel required for the description of the $J/\psi \to \gamma \bar{p}p$ decay predicts a $\bar{N}N$ bound state.

13 pages, 12 figures

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• Study of the decay mechanism for B+ to p pbar K+ and B+ to p pbar pi+
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Cited by in corpus (14)

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• A comprehensive study on the semileptonic decay of heavy flavor mesons
• Antiproton physics
• Final-state interaction in the process $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$
• The $\psi$(3770) resonance and its production in $\bar{p}p\to D\bar{D}$
• Invariant-mass spectrum of $\Lambda \bar{\Lambda }$ pair in the process $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$
• Near-threshold resonance in $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$ process
• $\Lambda \bar{\Lambda }$ final-state interaction in the reactions $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$ and $e^{+}{e}^{-}\to \eta \Lambda \bar{\Lambda }$
• Structure around $p\bar{p}$ threshold in $J/\psi$ radiative decays
• Looking for bound states and resonances in the ${\eta }^{\prime }K\bar{K}$ system
• Testing B-violating signatures from Exotic Instantons in future colliders
• Coupled-channel analysis of the near-threshold $e^{+}{e}^{-}\to N\bar{N}$ cross sections
• Hadronic rescattering to solve helicity puzzle in $B^{+}\to p\bar{p}{\pi }^{+}(K^{+})$ decays
• Baryon-antibaryon photoproduction cross sections off the proton