One Explanation for the Exotic State Y(4260)

Abstract

In this Letter we interpret the Y(4260), a state recently discovered by the BaBar Collaboration that has a mass within the range of conventional charmonium states, as having a molecular-state structure. In our scheme this molecular-like state is not constructed out of two-quark mesons, but rather out of baryons, i.e., the Y(4260) is a baryonium state. With this interpretation, the unusual measured properties of the Y(4260) are easily understood and some further peculiar decay characteristics are predicted.

five text pages, one ps figure. Version to appear in PLB

References in corpus (6)

• Observation of a Broad Structure in the ${\pi }^{+}{\pi }^{-}J/\psi$ Mass Spectrum around 4.26 GeV/$c^2$
• The Possible Interpretations of Y(4260)
• Possible Molecular Structure of the Newly Observed Y(4260)
• Charmonium's K2 peak
• Study of the Baryon-Antibaryon Low-Mass Enhancements in Charmless Three-body Baryonic B Decays
• The Y(4260) as an omega chi_{c1} molecular state

Cited by in corpus (74)

• Heavy quarkonium: progress, puzzles, and opportunities
• The hidden-charm pentaquark and tetraquark states
• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• New Charmonium States in QCD Sum Rules: a Concise Review
• Exotic Hadrons with Heavy Flavors -X, Y, Z and Related States-
• Higher Charmonia and X,Y,Z states with Screened Potential
• Evidence of a Broad Structure at an Invariant Mass of 4.32 GeV/$c^2$ in the Reaction $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (2S)$ Measured at BaBar
• Is X(3872) {\sl Really} a Molecular State?
• An overview of $XYZ$ new particles
• ${\Lambda }_{c}N$ bound states revisited
• New Hadron States
• Observation of Y(2175) in $J/\psi \to \eta \varphi f_0(980)$
• QCD Sum Rules Approach to the $X,Y$ and $Z$ States
• Exploring the threshold behavior and implications on the nature of Y(4260) and $Z_c(3900)$
• A Candidate for $1^{--}$ Strangeonium Hybrid
• The Y(4260) as a $J/\psi K\bar{K}$ system
• Non-strange partner of strangeonium-like state Y(2175)
• Study of J/psi->eta phi pi+pi- at BESIII
• Observation of the $Y(4230)$ and a new structure in $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$
• A Uniform Description of the States Recently Observed at B-factories
• The BESIII Physics Programme
• On the Nature of X(4260)
• Nonresonant explanation for the Y(4260) structure observed in the $e^{+}{e}^{-}\to J/\psi {\pi }^{+}{\pi }^{-}$ process
• Measurement of the $e^{+}{e}^{-}\to \eta J/\psi$ cross section and search for $e^{+}{e}^{-}\to {\pi }^{0}J/\psi$ at center-of-mass energies between 3.810 and 4.600~GeV
• The bound state problem of S-wave heavy quark meson-aitimeson systems
• Selected strong decay modes of Y(4260)
• Observation of a structure in $e^{+}{e}^{-}\to \varphi {\eta }^{\prime }$ at $\sqrt{s}$ from 2.05 to 3.08 GeV
• Study of J/Psi decays into eta Kstar Kstar-bar
• The $P$-wave $[cs][\bar{c}\bar{s}]$ tetraquark state: Y(4260) or Y(4660)?
• Strong decays of the $XYZ$ states
• Exclusive Production of $D_s^{+}{D}_s^{-}$, $D_s^{\ast +}{D}_s^{-}$, and $D_s^{\ast +}{D}_s^{\ast -}$ via $e^{+}{e}^{-}$ Annihilation with Initial-State-Radiation
• Lowest vector tetraquark states: $Y(4260/4220)$ or $Z_c(4100)$
• Baryonia and near-threshold enhancements
• Two charged strangeonium-like structures observable in the $Y(2175)\to \varphi (1020){\pi }^{+}{\pi }^{-}$ process
• Exotic $1^{--}$ States in QCD Sum Rules
• Baryonium, tetra-quark state and glue-ball in large N_c QCD
• Vector tetraquark state candidates: $Y(4260/4220)$, $Y(4360/4320)$, $Y(4390)$ and $Y(4660/4630)$
• Hidden-bottom and -charm hexaquark states in QCD sum rules
• Nature of the $Y(4260)$: A light-quark perspective
• Heavy quark spin selection rules in meson-antimeson states
• Prediction of an exotic state around 4240 MeV with $J^{PC}=1^{-+}$ as C-parity partner of Y(4260) in molecular picture
• Light baryonium spectrum
• A very broad X(4260) and the resonance parameters of the 3D vector charmonium state
• Baryonium Study in Heavy Baryon Chiral Perturbation Theory
• Study of the process $e^{+}{e}^{-}\to \varphi \eta$ at center-of-mass energies between 2.00 and 3.08 GeV
• Observation of $e^{+}{e}^{-}\to K\bar{K}J/\psi$ at center-of-mass energies from 4.189 to 4.600 GeV
• Could $Y_b(10890)$ be the P-wave $[bq][\bar{b}\bar{q}]$ tetraquark state?
• Y(4260) as a mixed charmonium-tetraquark state
• Study of ${\Lambda }_c$${\Lambda }_c$ dibaryon and ${\Lambda }_c$${\bar{\Lambda }}_c$ baryonium states via QCD sum rules
• Charmonium spectrum and new observed states
• Measurement of $e^{+}{e}^{-}\to {\pi }^0{\pi }^0\psi (3686)$ at $\sqrt{s}$ from 4.009 to 4.600 GeV and observation of a neutral charmoniumlike structure
• Cross section measurements of $e^{+}{e}^{-}\to p\bar{p}{\pi }^0$ at center-of-mass energies between 4.008 and 4.600 GeV
• Searching for hidden-charm baryonium signals in QCD sum rules
• Where are the hidden-charm hexaquarks?
• Observation of $e^{+}{e}^{-}\to \eta h_c$ at center-of-mass energies from 4.085 to 4.600 GeV
• Baryonium
• A novel explanation of charmonium-like structure in $e^{+}{e}^{-}\to \psi (2S){\pi }^{+}{\pi }^{-}$
• Studying the $D_{1}D$ molecule in the Bethe-Salpeter equation approach
• Search for the isospin violating decay $Y(4260)\to J/\psi \eta {\pi }^0$
• Double-charm and hidden-charm hexaquark states under the complex scaling method
• Is the Y(4260) just a coupled-channel signal?
• Heavy Hadron Spectroscopy
• $B^{(\ast )}{\bar{B}}^{(\ast )}$ intermediate state contribution to ${\rm Y}(4S,5S)\to {\eta }_b+\gamma$ radiative decay
• Search for the $B\to Y(4260)K,Y(4260)\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Mass spectra of $0^{--}$ and $0^{+-}$ hidden-heavy baryoniums
• Study of $e^{+}{e}^{-}\to \eta \varphi$ via Initial State Radiation at Belle
• Spectrum of Light Hexaquark States in Triquark-antitriquark Configuration
• New charmonium-like states
• Three-body strong decays of the $Y(4230)$ via the light-cone QCD sum rules
• Mass spectrum of the $\Omega \bar{\Omega }$ states
• Baryons and baryoniums in the perspective of QCD sum rules
• New charm resonances
• Study of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\omega$ process at center-of-mass energies between 4.0 and 4.6 GeV
• Pinpointing Physical Solutions in Y(4230) Decays