Study of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ and Observation of a Charged Charmonium-like State at Belle

Abstract

The cross section for $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ between 3.8 GeV and 5.5 GeV is measured with a 967 fb${}^{-1}$ data sample collected by the Belle detector at or near the ${\rm Y}(nS)$ ($n=1,2,...,5$) resonances. The Y(4260) state is observed, and its resonance parameters are determined. In addition, an excess of ${\pi }^{+}{\pi }^{-}J/\psi$ production around 4 GeV is observed. This feature can be described by a Breit-Wigner parameterization with properties that are consistent with the Y(4008) state that was previously reported by Belle. In a study of $Y(4260)\to {\pi }^{+}{\pi }^{-}J/\psi$ decays, a structure is observed in the $M(π^\pm\jpsi)$ mass spectrum with $5.2\sigma$ significance, with mass $M=(3894.5\pm 6.6\pm 4.5)\mathrm{MeV}/c^2$ and width $\Gamma =(63\pm 24\pm 26)$ MeV/$c^2$, where the errors are statistical and systematic, respectively. This structure can be interpreted as a new charged charmonium-like state.

10 pages, 5 figures, 2 tables, accepted by Phys. Rev. Lett

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• Evidence for $Z_c^{\pm }$ decays into the ${\rho }^{\pm }{\eta }_c$ final state
• Possible Molecular States Composed of Doubly Charmed Baryons with Couple-channel Effect
• Near-threshold Spectrum from Uniformized Mittag-Leffler Expansion -Pole Structure of $Z(3900)$-
• Study on possible molecular states composed of ${\Lambda }_c\bar{D}$ (${\Lambda }_{b}B$) and ${\Sigma }_c\bar{D}$ (${\Sigma }_{b}B$) within the Bethe-Salpeter framework
• The nature of $Z_b$ states from a combined analysis of ${\rm Y}(5S)\to h_b(mP){\pi }^{+}{\pi }^{-}$ and ${\rm Y}(5S)\to B^{(\ast )}{\bar{B}}^{(\ast )}\pi$
• Instanton effects on the heavy-quark static potential
• Physics Accomplishments and Future Prospects of the BES Experiments at the BEPC Collider
• Predicted $\Lambda \bar{\Lambda }$ and ${\Xi }^{-}{\bar{\Xi }}^{+}$ decay modes of the charmoniumlike $Y(4230)$
• The recoil correction and spin-orbit force for the possible $B^{\ast }{\bar{B}}^{\ast }$ and $D^{\ast }{\bar{D}}^{\ast }$ states
• Constraints from precision measurements on the hadron-molecule interpretation of X,Y,Z resonances
• Coherent helicity amplitude for sequential decays
• The decay widths of the $Z_{cs}(3985/4000)$ based on rigorous quark-hadron duality
• Possible hadronic molecular states composed of $S$-wave heavy-light mesons
• Understanding the ${\eta }_c\rho$ decay mode of $Z_c^{(\prime )}$ via the triangle loop mechanism
• Bottom Tetraquark Production at RHIC?
• Flavor Physics at the CEPC: a General Perspective
• Possible bound states with hidden bottom from ${\bar{K}}^{(\ast )}{B}^{(\ast )}{\bar{B}}^{(\ast )}$ systems
• Searching for tetraquark through weak decays of b-baryons
• Charmonium: Conventional and $XYZ$ States in a Relativistic Screened Potential Model
• The magnetic moment of $Z_c(3900)$ as an axial-vector molecular state
• Cross section measurements of the $e^{+}{e}^{-}\to D^{\ast +}{D}^{\ast -}$ and $e^{+}{e}^{-}\to D^{\ast +}{D}^{-}$ processes at center-of-mass energies from 4.085 to 4.600 GeV
• Evidence for $e^{+}{e}^{-}\to \gamma {\chi }_{c1,2}$ at center-of-mass energies from 4.009 to 4.360 GeV
• Properties of $Z_c^{\pm }(3900)$ produced in $p\bar{p}$ collision
• Measurement of $e^{+}{e}^{-}\to \eta J/\psi$ Cross Section from $\sqrt{s}=$ 3.808 GeV to 4.951 GeV
• Observation of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (3770)$ and $D_1(2420{)}^0{\bar{D}}^0+c.c.$
• Molecular states with hidden charm and strange in QCD Sum Rules
• Tetraquark states in the bottom sector and the status of the $Y_b$(10890) state
• Double Exotic States Productions in Pion and Kaon Induced Reactions
• Observation of $e^{+}{e}^{-}\to \varphi {\chi }_{c1}$ and $\varphi {\chi }_{c2}$ at $\sqrt{s}$=4.600 GeV
• Properties of ${\Sigma }_Q^{\ast }$, ${\Xi }_Q^{\ast }$ and ${\Omega }_Q^{\ast }$ heavy baryons in cold nuclear matter
• $D^{+}{D}^{-}$ hadronic atom and its production in $pp$ and $p\bar{p}$ collisions
• Analysis of the axialvector $B_c$-like tetraquark states with the QCD sum rules
• Search for the isospin violating decay $Y(4260)\to J/\psi \eta {\pi }^0$
• Hadronic Molecular States Composed of Spin-$\frac{3}{2}$ Singly Charmed Baryons
• Towards the understanding of $Z_c(3900)$ from lattice QCD
• Investigating efficient methods for computing four-quark correlation functions
• Status and Prospects of Exotic Hadrons at Belle II
• Search for $J^{PC}=1^{-+}$ exotic state in $e^{+}{e}^{-}$ annihilation
• Semi-inclusive electroproduction of hidden-charm and double-charm hadronic molecules
• Decay properties of the $Z_c(3900)$ through the Fierz rearrangement
• $K^0\Lambda$ and $D^{-}{\Lambda }_c^{+}$ production induced by pion beams off the nucleon
• Search for the rare decays $J/\psi \to D^0{e}^{+}{e}^{-}+c.c.$ and $\psi (3686)\to D^0{e}^{+}{e}^{-}+c.c.$
• Measurement of $e^{+}{e}^{-}\to \gamma {\chi }_{c0,c1,c2}$ cross sections at center-of-mass energies between 3.77 and 4.60 GeV
• hidden charm decays of $X(4014)$ in a $D^{\ast }{\bar{D}}^{\ast }$ molecule scenario
• Entanglement suppression and low-energy scattering of heavy mesons
• Simultaneous description of the $e^{+}{e}^{-}\to J/\psi \pi \pi (K\bar{K})$ processes
• On the origin of the $Y(4260)$
• Instanton effects on charmonium states
• The study of exotic state $Z_c^{\pm }(3900)$ decaying to $J/\psi {\pi }^{\pm }$ in the $pp$ collisions at $\sqrt{s}$ = 1.96, 7, and 13 TeV
• Hadronic molecular states with the quark contents $bc\bar{s}\bar{q}$, $b\bar{c}s\bar{q}$, and $b\bar{c}\bar{s}q$
• Substructure of Multiquark Hadrons (Snowmass 2021 White Paper)
• Evidence for $e^{+}{e}^{-}\to \gamma {\eta }_c(1S)$ at center-of-mass energies between 4.01 and 4.60 GeV
• Electromagnetic properties of the $T_{cc}^{+}$ molecular states
• Radially excited axial mesons and the enigmatic $Z_c$ and $Z_b$ in a coupled-channel model
• Can the $\psi (4040)$ explain the peak associated with $Y(4008)$?
• The $X(6900)$ peak could be a molecular state
• Detecting the pure triangle sigularity effect through the $\psi (2S)\to p\bar{p}\eta /p\bar{p}{\pi }^0$ process
• Radiative Transitions of Charmoniumlike Exotics in the Dynamical Diquark Model
• QCD Exotics
• Pion-induced production of the $Z_c(3900)$ off a nuclear target
• Tetraquarks, their Masses and Decays in QED_2
• SU(3) analysis of fully-light tetraquarks in heavy meson weak decays
• Study of $e^{+}{e}^{-}\to 2(p\bar{p})$ at center-of-mass energies between 4.0 and 4.6 GeV
• First measurement of $e^{+}{e}^{-}\to p{K}_S^0\bar{n}{K}^{-}+c.c.$ above open charm threshold
• Measurement of $e^{+}{e}^{-}\to \gamma {\chi }_{cJ}$ via initial state radiation at Belle
• Properties of $Z_c(3900)$ tetraquark in a cold nuclear matter
• Universal non-resonant explanation to charmoniumlike structures $Z_c(3885)$ and $Z_c(4025)$
• Photo- and electroproduction of $\Lambda (1405)$ via ${\gamma }^{(\ast )}p\to K^{+}{\pi }^{+}{\Sigma }^{-}$
• Study of the hidden charm $D{\bar{D}}^{\ast }$ interactions in chiral effective field theory
• Observation of the open-charm tetraquark candidate $T_{cs0}^{\ast }(2870{)}^0$ in the $B^{-}\to D^{-}{D}^0{K}_{\mathrm{S}}^0$ decay
• Two-pion exchange for coupled-channel scattering of two heavy mesons
• Faddeev fixed center approximation to $\pi \bar{K}{K}^{\ast }$ system and the ${\pi }_1(1600)$
• Measurements of $e^{+}{e}^{-}\to {\eta }_{\mathrm{c}}{\pi }^{+}{\pi }^{-}{\pi }^0$, ${\eta }_{\mathrm{c}}{\pi }^{+}{\pi }^{-}$ and ${\eta }_{\mathrm{c}}{\pi }^0\gamma$ at $\sqrt{s}$ from 4.18 to 4.60\,GeV, and search for a $Z_{\mathrm{c}}$ state close to the $D\bar{D}$ threshold decaying to ${\eta }_{\mathrm{c}}\pi$ at $\sqrt{s}$ = 4.23 GeV
• Magnetic and quadrupole moments of the $Z_c(4020{)}^{+}$, $Z_c(4050{)}^{+}$, and $Z_c(4600{)}^{+}$ states in the diquark-antidiquark picture
• Investigating the Isospin Property of $T_{cc}^{+}$ from its Dalitz Plot Distribution
• Search for the $B\to Y(4260)K,Y(4260)\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Search for $XYZ$ states in ${\rm Y}(1S)$ inclusive decays
• Are there near-threshold Coulomb-like Baryonia?
• Mass spectra of meson molecular states for heavy and light sectors
• Gluonic Hidden-charm Tetraquark States
• How can $X^{\pm }(5568)$ escape detection?
• Study on decays of $Z_c(4020)$ and $Z_c(3900)$ into $h_c+\pi$
• Masses of tetraquark states in the hidden charm sector above $D-D^{\ast }$ threshold
• Isospin analysis of $B\to D^{\ast }\bar{D}K$ and the absence of the $Z_c(3900)$ in $B$ decays
• Experimental dataset from BESIII detector at Beijing electron positron collider
• Prediction of charmoniumlike structures in the hidden-charm di-eta decays of higher charmonia
• Systematics of fully heavy dibaryons
• Role of the short-range dynamics in the formation of $D^{(\ast )}{\bar{D}}^{(\ast )}/B^{(\ast )}{\bar{B}}^{(\ast )}$ hadronic molecules
• New Spectroscopy with PANDA at FAIR: X, Y, Z and the F-wave Charmonium States
• Constraining the $DD{D}^{\ast }$ three-body bound state via the $Z_c(3900)$ pole
• Modifications on parameters of $Z(4430)$ in a dense medium
• Investigate the pentaquark resonance in the $NK$ system
• What We Know About the Lambda(1405)
• Hyperspherical-coordinate approach to the spectra and decay widths of hybrid quarkonia
• Gluons, Light and Heavy Quarks in the Instanton Vacuum
• On the emergence of heavy quark spin symmetry breaking in heavy quarkonium decays
• Charmoniumlike Channels $1^{+}$ with Isospin $1$ from Lattice and Effective Field Theory
• DeepQuark: A Deep-Neural-Network Approach to Multiquark Bound States
• Quark structure of the $X(4500)$, $X(4700)$ and ${\chi }_{\mathrm{c}}(4P,5P)$ states
• Possible molecules of triple-heavy pentaquarks within the extended local hidden gauge formalism
• Pole trajectories from $S$- and $P$-wave $D{\bar{D}}^{\ast }$ interactions
• Study of the hidden charm pentaquarks ${\Lambda }_{c\bar{c}}$ above $4$ GeV
• Light-front holographic QCD with generic dilaton profile
• Covariant tetraquark equations in quantum field theory
• First observation of $\gamma \gamma \to p\bar{p}{K}^{+}{K}^{-}$ and search for exotic baryons in $pK$ systems
• Spin and polarization analysis of $Z_{cs}$ state
• The XYZ mesons: what they aren't
• Radially excited $\psi$ mesons and the $Y$ enhancements
• Radiative decays of the neutral $Z_c(3900)$ and $Z_c(4020)$
• A Sum-Rules Analysis of Next-to-Leading-Order (NLO) QCD Perturbative Contributions to a $J^{PC}=0^{+-}$, $du\bar{d}\bar{u}$ Tetraquark Correlator
• Study of $e^{+}{e}^{-}\to \eta \varphi$ via Initial State Radiation at Belle
• Dynamical picture for the exotic XYZ states
• Schottky Anomaly and Hadronic Spectrum
• Isospin violation in the yield of S-wave heavy meson pairs near threshold
• $Z_c(3900)$ as a Four-Quark State
• Search for ${\rm Y}(1S,2S)\to Z_c^{+}{Z}_c^{(\prime )-}$ and $e^{+}{e}^{-}\to Z_c^{+}{Z}_c^{(\prime )-}$ at $\sqrt{s}$ = 10.52, 10.58, and 10.867 GeV
• Effect of the $K\overline{K}$ and $\eta \eta$ channels and interference phenomena in the two-pion and $K\overline{K}$ transitions of charmonia and bottomonia
• Interaction of exotic states in a hadronic medium: the $Z_c(3900)$ case
• Theory Concepts for Heavy Exotic Mesons
• Search for the reaction $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\chi }_{cJ}$ and a charmonium-like structure decaying to ${\chi }_{cJ}{\pi }^{\pm }$ between 4.18 and 4.60 GeV
• Search for the reaction channel $e^{+}{e}^{-}\to {\eta }_c\eta {\pi }^{+}{\pi }^{-}$ at center-of-mass energies from 4.23 to 4.60 GeV
• Multiquark States in the Thomas-Fermi Quark Model and on the Lattice
• Three-body strong decays of the $Y(4230)$ via the light-cone QCD sum rules
• Strong Decays of Charmonia
• Possible ${\Sigma }_c^{\ast }\bar{\Sigma }$ molecular states
• Cross section measurement of $e^{+}{e}^{-}\to \eta \psi (2S)$ and search for $e^{+}{e}^{-}\to \eta \tilde{X}(3872)$
• Application of the Thomas Fermi Quark Model to Multiquark Mesons
• Search for light tetraquark states in ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays
• Observation of pentaquark states and perspectives of further studies
• A study of the vector meson $\psi (4040)$
• The charmonium-like exotic hadron productions in $e^{+}{e}^{-}$ collisions at the BESIII energy with the PACIAE model
• Recent results on hot topics from Belle
• Hidden charm and bottom molecular states
• Nature of $X(2370)$
• Coupled-channel analysis of the process $\gamma \gamma \to {\pi }^0{\pi }^0$
• Improved description of e^+e^- \to p\bar{p}π^0 cross section line shape and more stringent constraints on ψ(3770) and ψ(4230) \to p\bar{p}π^0
• Looking for a vector charmonium-like state $Y$ in $e^{+}{e}^{-}\to \bar{D}{D}_1(2420)+c.c.$
• Lattice spectroscopy with focus on exotics
• Ballistic Lévy walk with rests: Escape from a bounded domain
• Production of hidden-heavy and double-heavy hadronic molecules at the $Z$ factory of CEPC
• Hadron and Quarkmonium Exotica
• Prospects for observing the missing $2D$ and $1F$ charmonium states around 4 GeV
• Partial Wave Analysis of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ and Cross Section Measurement of $e^{+}{e}^{-}\to {\pi }^{\pm }{Z}_c(3900{)}^{\mp }$ from 4.1271 to 4.3583 GeV
• Hybrid to Quarkonia transitions
• Dynamical transition between two mesons and a tetraquark
• New results on the XYZ states from Belle experiment
• Diquark correlations in baryons: the Interacting Quark Diquark Model
• Charged charmonium-like structures and the initial single chiral particle emission mechanism
• Study of $e^{+}{e}^{-}\to h^{+}{h}^{-}J/\psi (h=\pi ,K,p)$ via initial-state radiation at Belle~II
• Cross section measurement of $e^{+}{e}^{-}\to {\pi }^0{\pi }^0\psi (3686)$ from $\sqrt{s}=$ 4.008 GeV to 4.951 GeV
• X, Y, Z Search at Belle II
• Prospects for compact hexaquarks under the limitation imposed by quark confinement
• Unified coupled-channel description for the five near-threshold structures $\psi (3770)$, $G(3900)$, $R(3760)$, $R(3780)$ and $R(3810)$ from $e^{+}{e}^{-}$ annihilation
• On the origin of the narrow peak and the isospin symmetry breaking of the $X$(3872)
• Parametrically narrow tetraquark states containing one heavy quark and one heavy antiquark
• Meson scattering and tetraquarks in two-dimensional QCD
• Determination of the resonant parameters of chi_c0(3915) with global fit
• $Z_c(3900)$ as a tetraquark state: decay width in QCD sum rules
• Compact Tetraquark Interpretation of the XYZ States
• Recent Results on Hadron Spectroscopy from BESIII
• Exotic Charmonium-like States at BESIII
• X, Y and Z States
• Dalitz-plot decomposition for the $e^{+}{e}^{-}\to J/\psi \pi \pi (K\bar{K})$ and $e^{+}{e}^{-}\to h_c\pi \pi$ processes
• Some aspects on four quarks recombination
• Observation of the first iso-spin Charmonium-like State $Z_c(4020)$ }
• Exotic Quarkonium Spectroscopy: X(3872), Z_b(10610), and Z_b(10650) in Non-Relativistic Effective Theory
• $D{\bar{D}}^{\ast }$-$\pi J/\psi$ scatterings of coupled channels for $Z_c(3900)$ channel
• Exotic hadrons associated with $b$-quark
• Lattice QCD: Flavor Physics and Spectroscopy