Observation of a charged charmoniumlike structure in e+e- to pi+pi-J/psi at \sqrt{s}=4.26 GeV

Abstract

We study the process e+e- to pi+pi-J/psi at a center-of-mass energy of 4.260 GeV using a 525 pb^{-1} data sample collected with the BESIII detector operating at the Beijing Electron Positron Collider. The Born cross section is measured to be (62.9\pm 1.9\pm 3.7) pb, consistent with the production of the Y(4260). We observe a structure at around 3.9 GeV/c^2 in the π^\pm J/psi mass spectrum, which we refer to as the Z_c(3900). If interpreted as a new particle, it is unusual in that it carries an electric charge and couples to charmonium. A fit to the π^\pm J/psi invariant mass spectrum, neglecting interference, results in a mass of (3899.0\pm 3.6\pm 4.9) MeV/c^2 and a width of (46\pm 10\pm 20) MeV. Its production ratio is measured to be R=\frac{σ(e+e- to π^\pm Z_c(3900)^\mp to pi+pi-J/psi))} {σ(e+e- to pi+pi-J/psi)}=(21.5\pm 3.3\pm 7.5)%. In all measurements the first errors are statistical and the second are systematic.

7 pages, 4 figures. Version appears in PRL

References in corpus (5)

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• Probing the $XYZ$ states through radiative decays
• Fully Heavy Tetraquark $bb\bar{c}\bar{c}$: Lifetimes and Weak Decays
• Decays of Zb -> Upsilon + pi via triangle diagrams in heavy meson molecules
• Study of the XYZ states at the BESIII
• Present status on experimental search for pentaquarks
• 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
• Analytic approach to calculations of mass spectra and decay constants of heavy-light quarkonia in the framework of Bethe-Salpeter equation
• Properties of $P_c(4312)$ pentaquark and its bottom partner
• Two-particle contributions and nonlocal effects in the QCD sum rules for the axialvector tetraquark candidate $Z_c(3900)$
• $Z_c(4100)$ and $Z_c(4200)$ as hadrocharmonium
• Exotic Four Quark Matter: $Z_1(4475)$
• Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
• Insights into $Z_b(10610)$ and $Z_b(10650)$ from dipion transitions from ${\rm Y}(10860)$
• Spectroscopic parameters and decays of the resonance $Z_b(10610)$
• Testing the tetraquark structure for the $X$ resonances in low-lying region
• Low-energy Scattering of $(D^{\ast }{\bar{D}}^{\ast }{)}^{\pm }$ System and the Resonance-like Structure $Z_c(4025)$
• ${\eta }_{\mathrm{c}}$- and $J/\psi$-isoscalar meson bound states in the hadro-charmonium picture
• Improved understanding of the peaking phenomenon existing in the new di-$J/\psi$ invariant mass spectrum from the CMS Collaboration
• Recent progress on the study of the charmoniumlike states
• $Z_c(4430)$ and $Z_c(4200)$ as triangle singularities
• Mass Predictions of Vector ($1^{--}$) Double-gluon Heavy Quarkonium Hybrids from QCD Sum Rules
• Dimesonic states with the heavy-light flavour mesons
• Triply charmed dibaryons in the one boson exchange model
• Lattice QCD static potentials of the meson-meson and tetraquark systems computed with both quenched and full QCD
• A coupled-channel lattice study on the resonance-like structure $Z_c(3900)$
• Reanalysis of the $e^{+}{e}^{-}\to (D^{\ast }{\bar{D}}^{\ast }{)}^{\pm }{\pi }^{\mp }$ reaction and the claim for the $Z_c(4025)$ resonance
• Study on $Z_{cs}$ and excited $B_s^0$ states in the chiral quark model
• Precise determination of the pole position of the exotic $Z_c(3900)$
• The ${\Lambda }_c(2595)$ resonance as a dynamically generated state: the compositeness condition and the large $N_c$ evolution
• Search for B decays to final states with the eta_c meson
• $a_1(1260),a_1(1420)$ and the production in heavy meson decays
• Search for a strangeonium-like structure $Z_s$ decaying into $\varphi \pi$ and a measurement of the cross section $e^{+}{e}^{-}\to \varphi \pi \pi$
• Hadroproduction of ${\rm Y}(nS)$ above $B\bar{B}$ Thresholds and Implications for $Y_b(10890)$
• Study of $I=0$ bottomonium bound states and resonances in $S$, $P$, $D$ and $F$ waves with lattice QCD static-static-light-light potentials
• Baryonium
• Observation of $e^{+}{e}^{-}\to \eta h_c$ at center-of-mass energies from 4.085 to 4.600 GeV
• Disentangling the role of the $Y(4260)$ in $e^{+}{e}^{-}\to D^{\ast }{\bar{D}}^{\ast }$ and $D_s^{\ast }{\bar{D}}_s^{\ast }$ via line shape studies
• Masses and magnetic moments of exotic fully heavy pentaquarks
• Distinguishing cusp effects and near-threshold-pole effects
• Global coupled-channel analysis of $e^{+}{e}^{-}\to c\bar{c}$ processes in $\sqrt{s}=3.75-4.7$ GeV
• Nature of the $X(6900)$ in partial wave decomposition of $J/\psi J/\psi$ scattering
• Heavy hadron molecules in effective field theory: the emergence of exotic nuclear landscapes
• Measurements of the branching fractions of ${\eta }_c\to K^{+}{K}^{-}{\pi }^0$, $K_S^0{K}^{\pm }{\pi }^{\mp }$,$2({\pi }^{+}{\pi }^{-}{\pi }^0)$, and $p\bar{p}$
• Measurements of $e^{+}{e}^{-}\to K_S^0{K}^{\pm }{\pi }^{\mp }{\pi }^0$ and $K_S^0{K}^{\pm }{\pi }^{\mp }\eta$ at center-of-mass energies from $3.90$ to $4.60\mathrm{GeV}$
• The electromagnetic multipole moments of the charged open-flavor $Z_{\bar{c}q}$ states
• Measurement of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{D}^{+}{D}^{-}$ cross sections at center-of-mass energies from 4.190 to 4.946 GeV
• The interplay between compact and molecular structures in tetraquarks
• Weak Decays of Triply Heavy Tetraquarks $b\bar{c}b\bar{q}$
• Production of $Z_c(3900$) and $Z_c(4020)$ in $B_c$ decay
• Predictions of the hidden-charm molecular states with four-quark component
• Mapping a new cluster of charmoniumlike structures at $e^{+}{e}^{-}$ collisions
• The recoil correction and spin-orbit force for the possible $B^{\ast }{\bar{B}}^{\ast }$ and $D^{\ast }{\bar{D}}^{\ast }$ states
• 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
• SUSY with R-symmetry: confronting EW precision observables and LHC constraints
• Radiative and $\rho$ transitions between heavy quarkonium and isovector four-quark states
• Physics Accomplishments and Future Prospects of the BES Experiments at the BEPC Collider
• Possible Molecular States Composed of Doubly Charmed Baryons with Couple-channel Effect
• 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
• The impact of $S$-wave thresholds $D_{s1}{\bar{D}}_s+c.c.$ and $D_{s0}{\bar{D}}_s^{\ast }+c.c.$ on vector charmonium spectrum
• Exotic pentaquark states with the $qqQQ\bar{Q}$ configuration
• Constraints from precision measurements on the hadron-molecule interpretation of X,Y,Z resonances
• Near-threshold Spectrum from Uniformized Mittag-Leffler Expansion -Pole Structure of $Z(3900)$-
• Semi-inclusive lepto-production of hidden-charm exotic hadrons
• Doubly heavy tetraquarks: heavy quark bindings and chromomagnetically mixings
• Evidence for $Z_c^{\pm }$ decays into the ${\rho }^{\pm }{\eta }_c$ final state
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• The decay widths of the $Z_{cs}(3985/4000)$ based on rigorous quark-hadron duality
• Mass spectra of hidden heavy-flavor tetraquarks with two and four heavy quarks
• The $Z_b$ structures in a constituent quark model coupled-channels calculation
• Possible hadronic molecular states composed of $S$-wave heavy-light mesons
• Coherent helicity amplitude for sequential decays
• Understanding the ${\eta }_c\rho$ decay mode of $Z_c^{(\prime )}$ via the triangle loop mechanism
• Investigation of Mass and Decay Characteristics of the All-light Tetraquark
• Possible bound states with hidden bottom from ${\bar{K}}^{(\ast )}{B}^{(\ast )}{\bar{B}}^{(\ast )}$ systems
• Bottom Tetraquark Production at RHIC?
• Towards the decay properties of deuteron-like state $d_{N\Omega }$
• Flavor Physics at the CEPC: a General Perspective
• Large-scale defects hidden inside a topological insulator grown onto a 2D substrate
• Measurement of $e^{+}{e}^{-}\to \eta J/\psi$ Cross Section from $\sqrt{s}=$ 3.808 GeV to 4.951 GeV
• Colloquium: Hadron Production in Open-charm Meson Pair at $e^{+}{e}^{-}$ Collider
• Molecular states with hidden charm and strange in QCD Sum Rules
• Double Exotic States Productions in Pion and Kaon Induced Reactions
• Properties of ${\Sigma }_Q^{\ast }$, ${\Xi }_Q^{\ast }$ and ${\Omega }_Q^{\ast }$ heavy baryons in cold nuclear matter
• Observation of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (3770)$ and $D_1(2420{)}^0{\bar{D}}^0+c.c.$
• Searching for tetraquark through weak decays of b-baryons
• Observation of $e^{+}{e}^{-}\to \varphi {\chi }_{c1}$ and $\varphi {\chi }_{c2}$ at $\sqrt{s}$=4.600 GeV
• Properties of $Z_c^{\pm }(3900)$ produced in $p\bar{p}$ collision
• XYZ spectroscopy at electron-hadron facilities II: Semi-inclusive processes with pion exchange
• Double-Regge Exchange Limit for the $\gamma p\to K^{+}{K}^{-}p$ Reaction
• Configurational entropy of heavy-quark QCD exotica: engendering the next generation
• Investigation of pion-induced $f_1(1285)$ production off a nucleon target within an interpolating Reggeized approach
• The magnetic moment of $Z_c(3900)$ as an axial-vector molecular state
• Tetraquark states in the bottom sector and the status of the $Y_b$(10890) state
• Search for new decay modes of the ${\psi }_2(3823)$ and the process $e^{+}{e}^{-}\to {\pi }^0{\pi }^0{\psi }_2(3823)$
• Charmonium: Conventional and $XYZ$ States in a Relativistic Screened Potential Model
• The electromagnetic decays of $X(3823)$ as the ${\psi }_2(1^3{D}_2)$ state and its radial excited states
• Hadronic Molecular States Composed of Spin-$\frac{3}{2}$ Singly Charmed Baryons
• Investigating efficient methods for computing four-quark correlation functions
• Towards the understanding of $Z_c(3900)$ from lattice QCD
• Studying the $D_{1}D$ molecule in the Bethe-Salpeter equation approach
• $D^{+}{D}^{-}$ hadronic atom and its production in $pp$ and $p\bar{p}$ collisions
• Status and Prospects of Exotic Hadrons at Belle II
• Search for $J^{PC}=1^{-+}$ exotic state in $e^{+}{e}^{-}$ annihilation
• Spectrum of the molecular hexaquarks
• Search for the isospin violating decay $Y(4260)\to J/\psi \eta {\pi }^0$
• Semi-inclusive electroproduction of hidden-charm and double-charm hadronic molecules
• Analysis of the axialvector $B_c$-like tetraquark states with the QCD sum rules
• Investigations on the light hadron decays of $Z_b(10610)$ and $Z_b(10650)$
• Instanton effects on charmonium states
• Entanglement suppression and low-energy scattering of heavy mesons
• hidden charm decays of $X(4014)$ in a $D^{\ast }{\bar{D}}^{\ast }$ molecule scenario
• Identifying Hadronic Molecular States with a Neural Network
• The role of charged exotic states in $e^{+}{e}^{-}\to \psi (2S){\pi }^{+}{\pi }^{-}$
• Does the bottomonium counterpart of $X(3872)$ exist?
• Simultaneous description of the $e^{+}{e}^{-}\to J/\psi \pi \pi (K\bar{K})$ processes
• Tetraquark Masses by using extension of Gursey-Radicati Mass Formula
• $K^0\Lambda$ and $D^{-}{\Lambda }_c^{+}$ production induced by pion beams off the nucleon
• Analysis of the triply-charmed pentaquark states with QCD sum rules
• Decay properties of the $Z_c(3900)$ through the Fierz rearrangement
• Detecting the polarization in ${\chi }_{cJ}\to \varphi \varphi$ decays to probe hadronic loop effect
• Open charm contributions to the E1 transitions of $\psi (3686)$ and $\psi (3770)\to \gamma {\chi }_{cJ}$
• Radially excited axial mesons and the enigmatic $Z_c$ and $Z_b$ in a coupled-channel model
• Strange Quarkonium States at BESIII
• The doubly heavies: (Qbar Q qbar q), (Q Q qbar qbar) tetraquarks and (Q Q q) baryons
• Hadronic molecular states with the quark contents $bc\bar{s}\bar{q}$, $b\bar{c}s\bar{q}$, and $b\bar{c}\bar{s}q$
• 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
• Evidence for $e^{+}{e}^{-}\to \gamma {\eta }_c(1S)$ at center-of-mass energies between 4.01 and 4.60 GeV
• Diquark bound states with a completely crossed ladder truncation
• Electromagnetic properties of the $T_{cc}^{+}$ molecular states
• Is $J^{PC}=3^{-+}$ molecule possible?
• QCD Exotics
• 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
• The $X(6900)$ peak could be a molecular state
• Doubly charmed hexaquarks in the diquark picture
• Double pole structures of $X_1(2900)$ as the $P$-wave ${\bar{D}}^{\ast }{K}^{\ast }$ resonances
• Radiative Transitions of Charmoniumlike Exotics in the Dynamical Diquark Model
• Detecting the pure triangle sigularity effect through the $\psi (2S)\to p\bar{p}\eta /p\bar{p}{\pi }^0$ process
• Properties of $Z_c(3900)$ tetraquark in a cold nuclear matter
• First measurement of $e^{+}{e}^{-}\to p{K}_S^0\bar{n}{K}^{-}+c.c.$ above open charm threshold
• Pion-induced production of the $Z_c(3900)$ off a nuclear target
• New Studies of XYZ States at PANDA
• Tetraquarks, their Masses and Decays in QED_2
• Observation of the open-charm tetraquark candidate $T_{cs0}^{\ast }(2870{)}^0$ in the $B^{-}\to D^{-}{D}^0{K}_{\mathrm{S}}^0$ decay
• Beam Background Simulation and Experiment at BEPCII
• Search for the $B\to Y(4260)K,Y(4260)\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Investigating the Isospin Property of $T_{cc}^{+}$ from its Dalitz Plot Distribution
• Magnetic and quadrupole moments of the $Z_c(4020{)}^{+}$, $Z_c(4050{)}^{+}$, and $Z_c(4600{)}^{+}$ states in the diquark-antidiquark picture
• Mass Spectra of $qq\bar{q}\bar{q}$, $ss\bar{s}\bar{s}$ and $qq\bar{s}\bar{s}$ Tetraquarks using Regge Phenomenology
• Faddeev fixed center approximation to $\pi \bar{K}{K}^{\ast }$ system and the ${\pi }_1(1600)$
• Search for $XYZ$ states in ${\rm Y}(1S)$ inclusive decays
• Photo- and electroproduction of $\Lambda (1405)$ via ${\gamma }^{(\ast )}p\to K^{+}{\pi }^{+}{\Sigma }^{-}$
• 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
• Two-pion exchange for coupled-channel scattering of two heavy mesons
• Search for supersymmetric baryons near production threshold in terms of the superflavor symmetry
• Holographic three flavor baryon in the Witten-Sakai-Sugimoto model with the D0-D4 background
• Study of the hidden charm $D{\bar{D}}^{\ast }$ interactions in chiral effective field theory
• Doubly Heavy Tetraquarks and Baryons
• Constraining the $DD{D}^{\ast }$ three-body bound state via the $Z_c(3900)$ pole
• Heavy Exotic Molecules
• Role of the short-range dynamics in the formation of $D^{(\ast )}{\bar{D}}^{(\ast )}/B^{(\ast )}{\bar{B}}^{(\ast )}$ hadronic molecules
• Are there near-threshold Coulomb-like Baryonia?
• Experimental dataset from BESIII detector at Beijing electron positron collider
• Prediction of charmoniumlike structures in the hidden-charm di-eta decays of higher charmonia
• How can $X^{\pm }(5568)$ escape detection?
• Mass spectra of meson molecular states for heavy and light sectors
• Isospin analysis of $B\to D^{\ast }\bar{D}K$ and the absence of the $Z_c(3900)$ in $B$ decays
• New Spectroscopy with PANDA at FAIR: X, Y, Z and the F-wave Charmonium States
• 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
• Modifications on parameters of $Z(4430)$ in a dense medium
• Systematics of fully heavy dibaryons
• Prospects for detecting the hidden-strange pentaquarklike state $N^{\ast }(2080)$ in the ${\pi }^{-}p\to \varphi n$ reaction
• Gluonic Hidden-charm Tetraquark States
• Measurement of f${}_1$(1285) production in pp collisions at $\sqrt{\text{s}}$ = 13 TeV
• Quark structure of the $X(4500)$, $X(4700)$ and ${\chi }_{\mathrm{c}}(4P,5P)$ states
• Gluons, Light and Heavy Quarks in the Instanton Vacuum
• What We Know About the Lambda(1405)
• Constituent counting rule for exclusive production of heavy quarkoniumlike exotic resonance and a light hadron
• Investigate the pentaquark resonance in the $NK$ system
• DeepQuark: A Deep-Neural-Network Approach to Multiquark Bound States
• 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
• 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
• The XYZ mesons: what they aren't
• Investigation of Mass and Decay Characteristics of the Light-Strange Tetraquark
• First Observation of a Three-Resonance Structure in $e^{+}{e}^{-}\to$Nonopen Charm Hadrons
• First observation of $\gamma \gamma \to p\bar{p}{K}^{+}{K}^{-}$ and search for exotic baryons in $pK$ systems
• Study of $e^{+}{e}^{-}\to \eta \varphi$ via Initial State Radiation at Belle
• Radiative decays of the neutral $Z_c(3900)$ and $Z_c(4020)$
• Study of the hidden charm pentaquarks ${\Lambda }_{c\bar{c}}$ above $4$ GeV
• Regge Trajectories of Tetraquarks and Pentaquarks with Massive Quarks in the Flux Tube Model
• Dynamical picture for the exotic XYZ states
• Spin and polarization analysis of $Z_{cs}$ state
• Light-front holographic QCD with generic dilaton profile
• Heavy baryon production with an instanton interaction
• Possible molecules of triple-heavy pentaquarks within the extended local hidden gauge formalism
• Covariant tetraquark equations in quantum field theory
• Exploration of charmed pentaquarks
• Highlights from the COMPASS experiment at CERN -- Hadron spectroscopy and excitations
• 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
• Towards a Theoretical Understanding of the XYZ Mesons from QCD
• Spectrum of Light Hexaquark States in Triquark-antitriquark Configuration
• Review on Hadron Spectroscopy
• $Z_c(3900)$ as a Four-Quark State
• Isospin violation in the yield of S-wave heavy meson pairs near threshold
• Cross section measurements of $e^{+}{e}^{-}\to \Phi K^{+}{K}^{-}$ and $e^{+}{e}^{-}\to \Phi K_S^0{K}_S^0$ at center-of-mass energies between 3.7730 GeV and 4.7008 GeV
• Schottky Anomaly and Hadronic Spectrum
• Interaction of exotic states in a hadronic medium: the $Z_c(3900)$ case
• $N^{\ast }$ Production from $e^{+}{e}^{-}$ Annihilations
• Observation of pentaquark states and perspectives of further studies
• Multiquark States in the Thomas-Fermi Quark Model and on the Lattice
• Quark spin structures of bottom-charmed threshold molecular states
• Correction to the energy spectrum of ${}^1{S}_0$ heavy quarkonia due to two-gluon annihilation effect
• Application of the Thomas Fermi Quark Model to Multiquark Mesons
• Investigation of the $X(4020)$ peak in the $D^{\ast }{\bar{D}}^{\ast }$ and $\pi h_c$ channels
• Nature of $X(2370)$
• Predicting the Masses of Exotic Hadrons with Data Augmentation Using Multilayer Perceptron
• Recent results on hot topics from Belle
• Observation of $e^{+}{e}^{-}\to pp\bar{p}\bar{n}{\pi }^{-}+c.c.$
• Three-body strong decays of the $Y(4230)$ via the light-cone QCD sum rules
• Hidden charm and bottom molecular states
• Charmonium-like states from scattering on the lattice
• The charmonium-like exotic hadron productions in $e^{+}{e}^{-}$ collisions at the BESIII energy with the PACIAE model
• $Z_c(3900)$ in a hadronic molecule and a triangle singularity approach at finite temperature
• Doubly-charmed pentaquark states in a mass splitting model
• Possible ${\Sigma }_c^{\ast }\bar{\Sigma }$ molecular states
• 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
• 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 light tetraquark states in ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays
• Two charmoniumlike charged axial resonances near 3885 MeV
• Analysis of the tensor-tensor type scalar tetraquark states with QCD sum rules
• The Joint Physics Analysis Center: Recent results
• Diquark correlations in baryons: the Interacting Quark Diquark Model
• Dynamical transition between two mesons and a tetraquark
• On the Utility Function of Experiments in Fundamental Science
• Production of hidden-heavy and double-heavy hadronic molecules at the $Z$ factory of CEPC
• Differential technique for the covariant orbital angular momentum operators
• Strong decays of the isovector-scalar $D^{\ast }{\bar{D}}^{\ast }$ hadronic molecule
• Hadron and Quarkmonium Exotica
• Revisit the $Z_c(4025)$ structure observed by BESIII in the $e^{+}{e}^{-}\to (D^{\ast }{\bar{D}}^{\ast }{)}^{\pm ,0}{\pi }^{\mp ,0}$ reactions at $\sqrt{s}=4.26$ GeV
• 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
• Baryons and baryoniums in the perspective of QCD sum rules
• New results on the XYZ states from Belle experiment
• 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
• Charged charmonium-like structures and the initial single chiral particle emission mechanism
• Collective long-range particle correlations in proton-proton and proton-nucleus collisions at the LHC with the CMS detector
• Compact Tetraquark Interpretation of the XYZ States
• Recent Results on Hadron Spectroscopy from BESIII
• X, Y and Z States
• Some aspects on four quarks recombination
• Signature of an $h_1$ state from $J/\psi \to \eta K^{\ast 0}{\bar{K}}^{\ast 0}$ and theoretical description of the $Z_c(3900)$ and $Z_c(4020)$ as $D{\bar{D}}^{\ast }$ and $D^{\ast }{\bar{D}}^{\ast }$ molecular states
• Propagators of resonances and rescatterings of the decay products
• Studies of Charmonium-like States at BESIII
• Application of SNiPER framework to BESIII physics analysis
• 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
• Prospects for compact hexaquarks under the limitation imposed by quark confinement
• Cross section measurement of $e^{+}{e}^{-}\to {\pi }^0{\pi }^0\psi (3686)$ from $\sqrt{s}=$ 4.008 GeV to 4.951 GeV
• Exotic hadrons associated with $b$-quark
• Study of $e^{+}{e}^{-}\to h^{+}{h}^{-}J/\psi (h=\pi ,K,p)$ via initial-state radiation at Belle~II
• $D{\bar{D}}^{\ast }$-$\pi J/\psi$ scatterings of coupled channels for $Z_c(3900)$ channel
• Meson scattering and tetraquarks in two-dimensional QCD
• Heavy-flavor multimodal fragmentation to $S$-wave pentacharms at next-generation hadron colliders
• Recent results from Lattice QCD
• Identification of deuteron at BESIII
• $Z_c(3900)$ as a tetraquark state: decay width in QCD sum rules
• Exotic Quarkonium Spectroscopy: X(3872), Z_b(10610), and Z_b(10650) in Non-Relativistic Effective Theory
• 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
• Determination of the resonant parameters of chi_c0(3915) with global fit
• Exotic Charmonium-like States at BESIII
• Observation of the first iso-spin Charmonium-like State $Z_c(4020)$ }
• Lattice QCD: Flavor Physics and Spectroscopy