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.

arXiv comment13 pages, 12 figures

References in corpus (49)

• The two-nucleon system at next-to-next-to-next-to-leading order
• Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays
• Meson production in nucleon--nucleon collisions close to the threshold
• Observation of a resonance X(1835) in J/ψ--> γπ^+ π^- η^{\prime}
• Study of e+e- --> p anti-p via initial-state radiation at BABAR
• Confirmation of the X(1835) and observation of the resonances X(2120) and X(2370) in J/psi->gamma pi^+pi^-eta'
• Improving the convergence of the chiral expansion for nuclear forces I: Peripheral phases
• Near threshold enhancement of the ppbar mass spectrum in J/Psi decay
• Reinterpreting several narrow `resonances' as threshold cusps
• Observation of $B^{\pm }\to p\bar{p}{K}^{\pm }$
• One-pion-exchange final-state-interaction and the pbar p near threshold enhancement in J/psi -> gamma pbar p decays
• A New State of Baryonium
• Observation of B0bar --> D(*)0 p pbar
• 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
• X(1835) as the Lowest Mass Pseudoscalar Glueball and Proton Spin Problem
• Study of psi(2S) Decays to gamma p bar{p}, pi^0 p bar{p} and eta p bar{p} and Search for p bar{p} Threshold Enhancements
• Paris nucleon-antinucleon potential constrained by recent antiprotonic-atom data and antineutron-proton total cross sections
• Antiproton-Proton Channels in J/psi Decays
• Proton-Antiproton Annihilation in Baryonium
• Study of N* Production from J/Psi--> p pbar eta
• On the treatment of $NN$ interaction effects in meson production in $NN$ collisions
• Combined Description of $\overline{\mathbf{N}}\mathbf{N}$ Scattering and Annihilation With A Hadronic Model
• Model-independent view on the low-mass proton-antiproton enhancement
• Antinucleon-nucleon interaction in chiral effective field theory
• Radiative Decays of the Upsilon(1S) to a Pair of Charged Hadrons
• Study of the decay mechanism for B+ to p pbar K+ and B+ to p pbar pi+
• Energy-dependent partial-wave analysis of all antiproton-proton scattering data below 925 MeV/c
• On the strong energy dependence of the e^+e^- to ppbar amplitude near threshold
• A possible 0^{-+} glueball candidate X(1835)
• ppbar enhancement in B and J/Psi decay
• Baryonium with a phenomenological skyrmion-type potential
• Observation of two new $N^{\ast }$ resonances in $\psi (3686)\to p\bar{p}{\pi }^0$
• On the structure of the X(1835) baryonium
• Study of Jψdecaying into ωp \bar p
• Near Threshold Enhancement of p pbar System and p pbar Elastic Scattering
• Measurements of the Decays $B^0 \to \bar{D}^0\proton\antiproton$, $B^0 \to \bar{D}^{*0}\proton\antiproton$, $B^0 \to D^{-}\proton\antiprotonπ^+$, and $B^0 \to D^{*-}\proton\antiprotonπ^+$
• Partial wave analysis of J/psi to p pbar pi0
• Some properties of the newly observed X(1835) state at BES
• Extraction of scattering lengths from final-state interactions
• Evidence for CP violation in $B^{+}\to p\bar{p}{K}^{+}$ decays
• Study of $J/\psi \to \omega p\bar{p}$ at BESIII
• Studies of the decays $B^{+}\to p\bar{p}{h}^{+}$ and observation of $B^{+}\to \bar{\Lambda }(1520)p$
• On the Migdal-Watson approach to FSI effects in meson production in NN collisions
• Partial wave analysis of $\psi (2S)\to p\bar{p}\eta$
• Measurement of ${\chi }_{cJ}$ decaying into $p\bar{n}{\pi }^{-}$ and $p\bar{n}{\pi }^{-}{\pi }^0$
• Near threshold ppbar enhancement in the J/psi -> omega ppbar decay
• The proton-antiproton mass threshold structure in psi(3686) radiative decay revisited
• Search for baryonium and the physics at FAIR

Cited by in corpus (29)

• Nuclear effective field theory: status and perspectives
• Different pole structures in line shapes of the $X(3872)$
• Antinucleon-nucleon interaction at next-to-next-to-next-to-leading order in chiral effective field theory
• General considerations on the nature of $Z_b(10610)$ and $Z_b(10650)$ from their pole positions
• Hyperon electromagnetic form factors in the timelike region
• New structures in the proton-antiproton system
• Semileptonic $B$ and $B_s$ decays involving scalar and axial-vector mesons
• Origin of the structures observed in $e^{+}{e}^{-}$ annihilation into multipion states around the $\bar{p}p$ threshold
• A comprehensive study on the semileptonic decay of heavy flavor mesons
• A possible explanation of the threshold enhancement in the process $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$
• Antiproton physics
• Fine structure of the cross sections of $e^{+}{e}^{-}$ annihilation near the thresholds of $p\bar{p}$ and $n\bar{n}$ production
• Interaction of real and virtual $p\bar{p}$ pairs in $J/\psi \to p\bar{p}\gamma (\rho ,\omega )$ decays
• Antinucleon-nucleus interaction near threshold from the Paris $\bar{N}N$ potential
• $J/\psi \to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ and the structure observed around the $\bar{p}p$ threshold
• Interaction of antiprotons with nuclei
• Final-state interaction in the process $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$
• Angular distributions in $J/\psi \to p\bar{p}{\pi }^0(\eta )$ decays
• 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 $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$
• Structure around $p\bar{p}$ threshold in $J/\psi$ radiative decays
• $\Lambda \bar{\Lambda }$ final-state interaction in the reactions $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$ and $e^{+}{e}^{-}\to \eta \Lambda \bar{\Lambda }$
• Near-threshold resonance in $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$ process
• Studying the bound state of the $B\bar{K}$ system in the Bethe-Salpeter formalism
• Looking for bound states and resonances in the ${\eta }^{\prime }K\bar{K}$ system
• Coupled-channel analysis of the near-threshold $e^{+}{e}^{-}\to N\bar{N}$ cross sections
• Testing B-violating signatures from Exotic Instantons in future colliders
• Hadronic rescattering to solve helicity puzzle in $B^{+}\to p\bar{p}{\pi }^{+}(K^{+})$ decays
• Baryon-antibaryon photoproduction cross sections off the proton