Near threshold enhancement of the ppbar mass spectrum in J/Psi decay

Abstract

We investigate the nature of the near-threshold enhancement in the ppbar invariant mass spectrum of the reaction J/Psi -> gamma ppbar reported recently by the BES Collaboration. Using the Juelich NNbar model we show that the mass dependence of the ppbar spectrum close to the threshold can be reproduced by the S-wave ppbar final state interaction in the isospin I=1 state within the Watson-Migdal approach. However, because of our poor knowledge of the NNbar interaction near threshold and of the J/Psi -> gamma ppbar reaction mechanism and in view of the controversal situation in the decay J/Psi -> pi0 ppbar, where no obvious signs of a ppbar final state interaction are seen, explanations other than final state interactions cannot be ruled out at the present stage.

arXiv comment9 pages, 7 figures

References in corpus (22)

• 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
• Meson production in nucleon--nucleon collisions close to the threshold
• 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
• Observation of B0bar --> D(*)0 p pbar
• Dispersion-theoretical analysis of the nucleon electromagnetic form factors: Inclusion of time-like data
• 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
• How to extract the $\Lambda N$ scattering length from production reactions
• A Method to Polarize Stored Antiprotons to a High Degree
• The reactions $pp\to p\Lambda K^{+}$ and $pp\to p{\Sigma }^0{K}^{+}$ near their thresholds
• Eta-N Final State Interaction in incoherent Photoproduction of Eta-mesons from the Deuteron near Threshold
• Production of eta mesons in nucleon-nucleon collisions
• An analysis of the reaction pp --> ppηnear threshold
• Quasi-nuclear and quark model baryonium: historical survey
• Analysis of the Lambda p Final State Interaction in the Reaction p+p->K^+(Lambda p)
• On the Migdal-Watson approach to FSI effects in meson production in NN collisions
• Measurement of Branching Ratios for ${\eta }_c$ Hadronic Decays
• Incoherent Eta Photoproduction from the Deuteron near Threshold

Cited by in corpus (72)

• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• The Physics of the B Factories
• Observation of a resonance X(1835) in J/ψ--> γπ^+ π^- η^{\prime}
• A New Hadron Spectroscopy
• 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
• Different pole structures in line shapes of the $X(3872)$
• 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
• Radiative Decays of the Upsilon(1S) to a Pair of Charged Hadrons
• Antinucleon-nucleon interaction at next-to-next-to-next-to-leading order in chiral effective field theory
• Observation of a ppb mass threshoud enhancement in ψ^\prime\toπ^+π^-J/ψ(J/ψ\toγp\bar{p}) decay
• Dynamical generation of pseudoscalar resonances
• 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
• Observation of a Fine Structure in $e^{+}{e}^{-}\to$ hadrons Production at the Nucleon-antinucleon Threshold
• Partial waves of baryon-antibaryon in three-body B meson decay
• 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 $B^0 \to D^{*-}\proton\antiprotonπ^+$
• Angular distributions in three-body baryonic B decays
• Some properties of the newly observed X(1835) state at BES
• Study of $J/\psi \to \omega p\bar{p}$ at BESIII
• Rescattering Effect and Near Threshold Enhancement of $p\bar{p}$ System
• Cross section measurements of $e^{+}{e}^{-}\to p\bar{p}{\pi }^0$ at center-of-mass energies between 4.008 and 4.600 GeV
• Forward antiproton-deuteron elastic scattering and total spin-dependent antiproton-deuteron cross sections at intermediate energies
• Isoscalar amplitude dominance in $e^{+}e-$ annihilation to $N\bar{N}$ pair close to the threshold
• Interaction of real and virtual $p\bar{p}$ pairs in $J/\psi \to p\bar{p}\gamma (\rho ,\omega )$ decays
• Study of the anomalous cross-section lineshape of e^+e^-\to D\bar D at ψ(3770) with an effective field theory
• The semileptonic baryonic decay $D_s^{+}\to p\bar{p}{e}^{+}{\nu }_e$
• Baryon Antibaryon Nonets
• Near threshold ppbar enhancement in the J/psi -> omega ppbar decay
• $J/\psi \to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ and the structure observed around the $\bar{p}p$ threshold
• Observation of B- to pbar Lambda D0 at Belle
• Subthreshold rho contribution in J/psi decay to omega pion pion and Kaon anti-Kaon pion
• 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
• $N\bar{N}$ Scattering at NLO Order in An Effective Theory
• Final stare interaction enhancement effect on the near threshold p\bar p system in B^\pm\to p\bar p \p^\pm decay
• Analysis of the X(1835) and related baryonium states with Bethe-Salpeter equation
• Strong and Electromagnetic Decays of X(1835) as a Baryonium State
• Final State Interaction Effects in the $e^{+}{e}^{-}\to N\bar{N}$ Process near Threshold
• Rescattering effects of baryon and antibaryon in heavy quarkonium decays
• Angular distributions in $J/\psi \to p\bar{p}{\pi }^0(\eta )$ decays
• Extraction of baryonia from the lightest anti-protonic atoms
• Invariant-mass spectrum of $\Lambda \bar{\Lambda }$ pair in the process $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$
• $\Lambda \bar{\Lambda }$ final-state interaction in the reactions $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$ and $e^{+}{e}^{-}\to \eta \Lambda \bar{\Lambda }$
• 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
• Observation of $\psi (3686)\to p\bar{p}\varphi$
• Search for the decay ${\overline{B}}^0\to {\Lambda }_{\mathrm{c}}^{+}\overline{p}p\overline{p}$
• Reexamination of antinucleon-nucleon interactions in covariant chiral effective field theory
• Role of t-channel meson exchange in S-wave pi N and K N scattering
• Spin dependence of the antinucleon-nucleon interaction
• Decay Widths of X(1835) as Nucleon-Antinucleon Bound State
• Proposal of Direct Search for Strongly Bound States of ppbar, npbar Systems with High Intensity and Collective pbar beam
• Coupled-channel analysis of the near-threshold $e^{+}{e}^{-}\to N\bar{N}$ cross sections
• Analysis of the $X(1835)$ as a baryonium state with Bethe-Salpeter equation
• Baryons and baryoniums in the perspective of QCD sum rules
• Psi to N Nbar m
• Baryon-antibaryon photoproduction cross sections off the proton
• Observation of ${\chi }_{cJ}(J=0,1,2)\to p\bar{p}\eta \eta$
• Analysis of the ${\mathbf{e}}^{+}{\mathbf{e}}^{-}\to \mathbf{J}/\mathbf{\psi D}\bar{\mathbf{D}}$ reaction close to the threshold concerning claims of a ${\chi }_{c0}(2P)$ state
• $P_c(4312{)}^{+}$ and $P_c(4337{)}^{+}$ as interfering ${\Sigma }_c\bar{D}$ and ${\Lambda }_c{\bar{D}}^{\ast }$ threshold cusps