Antiproton-Proton Channels in J/psi Decays

Abstract

The recent measurements by the BES Collaboration of J/psi decays into a photon and a proton-antiproton pair indicate a strong enhancement at the proton-antiproton threshold not observed in the decays into a neutral pion and a proton-antiproton pair. Is this enhancement due to a proton-antiproton quasi-bound state or a baryonium? A natural explanation follows from a traditional model of proton-antiproton interactions based on G-parity transformation. The observed proton-antiproton structure is due to a strong attraction in the 1S0 state, and possibly to a near-threshold quasi-bound state in the 11S0 wave.

arXiv comment6 pages, 5 figures. The antiproton-proton pair being in isospin one in the J/Psi decay into neutral pion-antiproton-proton, the antiproton-proton 1P1 and 3S1 waves have been replaced by the 31P1 and 33S1 ones and Figs. 1 and 2 have been replaced accordingly. Conclusions are unchanged. Most of the content of the paper is published in Phys. Rev. C72, 011001 (2005)

References in corpus (11)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays
• Near threshold enhancement of the ppbar mass spectrum in J/Psi decay
• Reinterpreting several narrow `resonances' as threshold cusps
• One-pion-exchange final-state-interaction and the pbar p near threshold enhancement in J/psi -> gamma pbar p decays
• Model-independent view on the low-mass proton-antiproton enhancement
• Information on antiprotonic atoms and the nuclear periphery from the PS209 experiment
• Understanding the Possible Proton Antiproton Bound State Observed by BES Collaboration
• Optical potentials for the antiproton nucleus interactions
• Exclusive J/Psi and Psi'decays into baryon-antibaryon pairs
• Low-Mass Proton-Antiproton Enhancement: Belle and BES Results, Premises of LEAR and Expectations from CLAS

Cited by in corpus (44)

• Observation of a resonance X(1835) in J/ψ--> γπ^+ π^- η^{\prime}
• Spin-Parity Analysis of ppbar Mass Threshold Structure in J/psi and psi' Radiative Decays
• The electromagnetic form factors of the proton in the timelike region
• Paris nucleon-antinucleon potential constrained by recent antiprotonic-atom data and antineutron-proton total cross sections
• Antinucleon-nucleon interaction at next-to-next-to-next-to-leading order in chiral effective field theory
• 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
• Reconciling the X(4630) with the Y(4660)
• Dispersion-theoretical analysis of the electromagnetic form factors of the nucleon: Past, present and future
• A possible 0^{-+} glueball candidate X(1835)
• ppbar enhancement in B and J/Psi decay
• On the strong energy dependence of the e^+e^- to ppbar amplitude near threshold
• 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
• On the structure of the X(1835) baryonium
• On the electromagnetic form factors of hadrons in the time-like region near threshold
• 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
• $X(1835)$ and the New Resonances $X(2120)$ and $X(2370)$ Observed by the BES Collaboration
• Some properties of the newly observed X(1835) state at BES
• Nuclear surface studies with antiprotonic atom X-rays
• Rescattering Effect and Near Threshold Enhancement of $p\bar{p}$ System
• Antiproton physics
• Study of $\eta (1475)$ and $X(1835)$ in radiative $J/\psi$ decays to $\gamma \varphi$
• Measurements of psi'-> pbar K+ sigma0 and chi_cj->pbar K+ Lambda
• Isoscalar amplitude dominance in $e^{+}e-$ annihilation to $N\bar{N}$ pair close to the threshold
• A possible mechanism for producing the threshold enhancement in $J/\psi \to \gamma p\bar{p}$
• Near threshold ppbar enhancement in the J/psi -> omega ppbar decay
• Antinucleon-nucleus interaction near threshold from the Paris $\bar{N}N$ potential
• The $X(2239)$ and $\eta (2225)$ as hidden-strange molecular states from $\Lambda \bar{\Lambda }$ interaction
• Interaction of antiprotons with nuclei
• Measurement of the Spin-Dependence of the pbar-p Interaction at the AD-Ring
• Final State Interaction Effects in the $e^{+}{e}^{-}\to N\bar{N}$ Process near Threshold
• Final state Coulomb interaction and asymmetry of pair production close to threshold in $e^{+}{e}^{-}$ annihilation
• The proton-antiproton mass threshold structure in psi(3686) radiative decay revisited
• Study of two-photon decays of pseudoscalar mesons via $J/\psi$ radiative decays
• Looking for bound states and resonances in the ${\eta }^{\prime }K\bar{K}$ system
• Search for the process $e^{+}{e}^{-}\to J/\psi +X(1835)$ at $\sqrt{s}\approx 10.6$GeV
• Nonstrange baryonia
• Observation of the decays ${\chi }_{cJ}\to n{K}_S^0\bar{\Lambda }+c.c.$
• Decay Widths of X(1835) as Nucleon-Antinucleon Bound State
• Search for baryonium and the physics at FAIR
• Probing the existence of η^3He mesic nucleus with a few-body approach