Observation of a resonance X(1835) in J/ψ--> γπ^+ π^- η^{\prime}

Abstract

The decay channel J/ψ--> γπ^+ π^- η^{\prime} is analyzed using a sample of 5.8\times 10^7 Jψevents collected with the BESII detector. A resonance, the X(1835), is observed in the π^+ π^- η^{\prime} invariant mass spectrum with a statistical significance of 7.7 σ. A fit with a Breit-Wigner function yields a mass M = 1833.7 \pm 6.1(stat) \pm 2.7(syst) MeV/c^2, a width Γ= 67.7 \pm 20.3(stat) \pm 7.7(syst) MeV/c^2 and a product branching fraction B(J/ψ--> γX) B(X --> π^+ π^- η^{\prime}) = (2.2 \pm 0.4(stat) \pm 0.4(syst)) \times 10^{-4}. The mass and width of the X(1835) are not compatible with any known meson resonance. Its properties are consistent with expectations for the state that produces the strong p\bar{p} mass threshold enhancement observed in the Jψ-->γp \bar{p} process at BESII.

5 pages, 3 figures, RevTex4, Submitted to Phys. Rev. Lett

References in corpus (14)

• 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
• 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
• Low-Mass Baryon-Antibaryon Enhancements in B Decays
• Antiproton-Proton Channels in J/psi Decays
• BESII Detector Simulation
• Proton-Antiproton Annihilation in Baryonium
• Observation of a threshold enhancement in the p \bar{Lambda} invariant mass spectrum
• Baryonium with a phenomenological skyrmion-type potential
• Understanding the Possible Proton Antiproton Bound State Observed by BES Collaboration
• Quasi-nuclear and quark model baryonium: historical survey
• Meson-Baryon Scattering in QCD_2 for any Coupling

Cited by in corpus (123)

• Pentaquark and Tetraquark states
• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• An updated review of the new hadron states
• Threshold cusps and triangle singularities in hadronic reactions
• STCF Conceptual Design Report: Volume 1 -- Physics & Detector
• Confirmation of the X(1835) and observation of the resonances X(2120) and X(2370) in J/psi->gamma pi^+pi^-eta'
• New Hadron States
• Evidence for a new structure in the $J/\psi p$ and $J/\psi \bar{p}$ systems in $B_s^0\to J/\psi p\bar{p}$ decays
• A New Hadron Spectroscopy
• Spin-Parity Analysis of ppbar Mass Threshold Structure in J/psi and psi' Radiative Decays
• Understanding the property of $\eta (1405/1475)$ in the $J/\psi$ radiative decay
• 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
• Decay of the pseudoscalar glueball into scalar and pseudoscalar mesons
• Effects of S-wave thresholds
• Paris nucleon-antinucleon potential constrained by recent antiprotonic-atom data and antineutron-proton total cross sections
• Study of J/psi->eta phi pi+pi- at BESIII
• Categorizing resonances X(1835), X(2120) and X(2370) in the pseudoscalar meson family
• Observation of an anomalous line shape of the ${\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ mass spectrum near the $p\bar{p}$ mass threshold in $J/\psi \to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$
• Observation of a ppb mass threshoud enhancement in ψ^\prime\toπ^+π^-J/ψ(J/ψ\toγp\bar{p}) decay
• Decays of $J/\psi$ and ${\psi }^{\prime }$ into vector and pseudoscalar meson and the pseudoscalar glueball-$q\bar{q}$ mixing
• Dynamical generation of pseudoscalar resonances
• ppbar enhancement in B and J/Psi decay
• A possible 0^{-+} glueball candidate X(1835)
• Observation and Spin-Parity Determination of the $X(1835)$ in $J/\psi \to \gamma K_S^0{K}_S^0\eta$
• 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
• 0^-+ Trigluon Glueball and its Implication for a Recent BES Observation
• On the structure of the X(1835) baryonium
• Diquark and light four-quark states
• $X(1835)$ and $\eta (1760)$ observed by the BES Collaboration
• Study of Jψdecaying into ωp \bar p
• Evidence for the B0->ppbarK*0 and B+->eta_cK*+ decays and Study of the Decay Dynamics of B Meson Decays into ppbarh Final States
• Partial waves of baryon-antibaryon in three-body B meson decay
• Observation of a broad 1^-- resonant structure around 1.5 GeV/$c^2$ in the K^+K^- mass spectrum in J/psi --> K^+K^-pi^0
• Possible structure of the newly found exotic state ${\eta }_1(1855)$
• X(1835) as a baryonium state with QCD sum rules
• Excited states of $\varphi$ meson
• Study of resonant structure around 1.8 GeV/$c^2$ and $\eta (1405)$ in $J/\psi \to \omega \eta {\pi }^{+}{\pi }^{-}$
• Baryonia and near-threshold enhancements
• 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 $B^0 \to D^{*-}\proton\antiprotonπ^+$
• 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
• The $\eta (2225)$ observed by the BES Collaboration
• Exclusive Baryonic B Decays Circa 2005
• Some properties of the newly observed X(1835) state at BES
• Hints for the existence of hexaquark states in the baryon-antibaryon sector
• Towards the assignment for the $4^1{S}_0$ meson nonet
• 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
• Light baryonium spectrum
• Observation of a state $X(2600)$ in the ${\pi }^{+}{\pi }^{-}{\eta }^{\prime }$ system in the process $J/\psi \to \gamma {\pi }^{+}{\pi }^{-}{\eta }^{\prime }$
• Study of $J/\psi \to \omega p\bar{p}$ at BESIII
• A fast simulation package for STCF detector
• What can we learn about light-meson interactions at electron-positron colliders?
• Prospects for e+e- physics at Frascati between the phi and the psi
• X(1835), X(2120) and X(2370) in a flux tube model
• Nucleon-antinucleon Interaction from the Modified Skyrme Model
• Light unflavor vector meson spectroscopy around the mass range of $2.4\sim 3$ GeV and possible experimental evidence
• Strong decays of the $X(2500)$ newly observed by the BESIII Collaboration
• Influence of the axial anomaly on the decay $N(1535)\to N\eta$
• Potential higher radial excitations in the light pseudoscalar meson family
• First study of η_c, η(1760) and X(1835) production via η'π^+π^- final states in two-photon collisions
• Decays of the vector glueball
• Study of $\eta (1475)$ and $X(1835)$ in radiative $J/\psi$ decays to $\gamma \varphi$
• QCD sum rule studies on the $ss\bar{s}\bar{s}$ tetraquark states of $J^{PC}=0^{-+}$
• Revisiting the pseudoscalar meson and glueball mixing and key issues in the search for pseudscalar glueball state
• Observation of the Anomalous Shape of $X(1840)$ in $J/\psi \to \gamma 3({\pi }^{+}{\pi }^{-})$ Indicating a Second Resonance Near $p\bar{p}$ Threshold
• The semileptonic baryonic decay $D_s^{+}\to p\bar{p}{e}^{+}{\nu }_e$
• Studying $X(2100)$ hadronic decays and predicting its pion and kaon induced productions
• Spectroscopy of ${\mathrm{q}}^3{\bar{\mathrm{q}}}^3$-States in Quark Model and Baryon-Antibaryon Enhancements
• Decay modes of the excited pseudoscalar glueball
• Physics Accomplishments and Future Prospects of the BES Experiments at the BEPC Collider
• SUSY with R-symmetry: confronting EW precision observables and LHC constraints
• Observation of B- to pbar Lambda D0 at Belle
• A possible mechanism for producing the threshold enhancement in $J/\psi \to \gamma p\bar{p}$
• Investigation of Mass and Decay Characteristics of the All-light Tetraquark
• Light 2++ and 0++ mesons
• Gluonic nature of the newly observed state $X(2600)$
• $J/\psi \to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ and the structure observed around the $\bar{p}p$ threshold
• Meson Emission Model of Psi to N Nbar m Charmonium Strong Decays
• Charmonium possibility of X(3872)
• Analysis of the X(1835) and related baryonium states with Bethe-Salpeter equation
• Study of light tetraquark spectroscopy
• Strong and Electromagnetic Decays of X(1835) as a Baryonium State
• Observation of $J/\psi$ Electromagnetic Dalitz Decays to $X(1835)$, $X(2120)$ and $X(2370)$
• Decay of the pseudoscalar glueball and its first excited state into scalar and pseudoscalar mesons and their first excited states
• SU(3) analysis of fully-light tetraquarks in heavy meson weak decays
• Fully-strange tetraquark states with the exotic quantum numbers $J^{PC}=0^{+-}$ and $2^{+-}$
• Exclusive glueball production in high energy nucleus-nucleus collisions
• QCD Exotics
• The fully-light vector tetraquark states with explicit P-wave via the QCD sum rules
• Glueball Production via Gluonic Penguin B Decays
• Structure around $p\bar{p}$ threshold in $J/\psi$ radiative decays
• Extraction of baryonia from the lightest anti-protonic atoms
• The proton-antiproton mass threshold structure in psi(3686) radiative decay revisited
• Baryonium, a common ground for atomic and high energy physics
• Measurement of the branching fraction of $J/\psi \to \omega {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ and search for $J/\psi \to \omega X(1835),X(1835)\to {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ decay
• Baryonia with open and hidden strange
• Observation of $\psi (3686)\to p\bar{p}\varphi$
• Reexamination of antinucleon-nucleon interactions in covariant chiral effective field theory
• Looking for bound states and resonances in the ${\eta }^{\prime }K\bar{K}$ system
• Measurement of the Branching Fraction for J/ψ-> p \bar{p}ηand p \bar{p} η^{'}
• Protonium: Discovery and Prediction
• Light tetraquark states with the exotic quantum number $J^{PC}=3^{-+}$
• Spectrum of Light Hexaquark States in Triquark-antitriquark Configuration
• Search for the process $e^{+}{e}^{-}\to J/\psi +X(1835)$ at $\sqrt{s}\approx 10.6$GeV
• $\tau$ mass and $R$ value measurements at BES
• Master formula approach to broken chiral U(3)xU(3) symmetry
• Nonstrange baryonia
• Understanding light scalar meson by color-magnetic wavefunction in QCD sum rule
• Analysis of the $X(1835)$ as a baryonium state with Bethe-Salpeter equation
• Decay Widths of X(1835) as Nucleon-Antinucleon Bound State
• Highlights of recent BESIII results
• Proposal of Direct Search for Strongly Bound States of ppbar, npbar Systems with High Intensity and Collective pbar beam
• Mass spectrum of the $\Omega \bar{\Omega }$ states
• Coupled-channel analysis of the near-threshold $e^{+}{e}^{-}\to N\bar{N}$ cross sections
• Baryons and baryoniums in the perspective of QCD sum rules
• Search for baryonium and the physics at FAIR
• Light hadron, Charmonium(-like) and Bottomonium(-like) states
• Fully strange tetraquark states via QCD sum rules
• Recent Results on Hadron Spectroscopy from BESIII
• Observation of the $X(1840)$ at BESIII