Exotica

Abstract

The first evidence for Quantum Chromodynamics (QCD), the theory of the strong interactions, came from the systematics of baryon and meson spectroscopy. An important early observation was the apparent absence of exotics, baryons requiring more than three quarks or mesons requiring more than quark-antiquark. Years later, QCD is well established, hadron spectroscopy has been relatively inactive, but the absence of exotics remains poorly understood. The recent observation of narrow, prominent exotic baryons has stirred up new interest in hadron spectroscopy. At present the experimental situation is confused; so is theory. The recent discoveries are striking. So too is the complete absence of exotic mesons, and, except for the recent discoveries, of exotic baryons as well. Whether or not the new states are confirmed, the way we look at complicated states of confined quarks and gluons has changed. Perhaps the most lasting result, and the one emphasized in these notes, is a new appreciation for the role of diquark correlations in QCD.

Abstract and Introduction modified for publication in Physics Reports. Typographical corrections. 34 pages, 14 figures, 4 tables; These notes are a distillation of talks presented at QM2004, Berkeley, CA, January 2004; Multiquark Hadrons: Four, Five and More?, Kyoto, Japan, February 2004; Continuous Advances in QCD 2004, Minneapolis, MN, May 2004; the JLab Annual Users Meeting, June 2004; BEACH'04, Chicago, IL, June 2004; and The Workshop on Strings & QCD, Trento, Italy, July 2004, and elsewhere

References in corpus (1)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)

Cited by in corpus (392)

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• An updated review of the new hadron states
• Electron-Ion Collider in China
• A review of the open charm and open bottom systems
• Baryon spectroscopy
• Heavy-quark symmetry implies stable heavy tetraquark mesons $Q_i{Q}_j{\bar{q}}_k{\bar{q}}_l$
• Threshold cusps and triangle singularities in hadronic reactions
• The New Pentaquarks in the Diquark Model
• Multiquark States
• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• Masses of excited heavy baryons in the relativistic quark-diquark picture
• Four-Quark Hadrons: an Updated Review
• Four Quark Interpretation of Y(4260)
• Lattice Prediction for Deeply Bound Doubly Heavy Tetraquarks
• Masses of heavy tetraquarks in the relativistic quark model
• 50 Years of Quantum Chromodynamics
• Masses of tetraquarks with two heavy quarks in the relativistic quark model
• Study of doubly heavy tetraquarks in Lattice QCD
• Analysis of the X(3872), Z_c(3900) and Z_c(3885) as axial-vector tetraquark states with QCD sum rules
• Masses of heavy baryons in the relativistic quark model
• Pentaquark states in a diquark-triquark model
• Diquark Correlations in Hadron Physics: Origin, Impact and Evidence
• Weak decays of heavy hadrons into dynamically generated resonances
• Assignments of ${\Lambda }_Q$ and ${\Xi }_Q$ baryons in the heavy quark-light diquark picture
• Four-quark spectroscopy within the hyperspherical formalism
• An interacting quark-diquark model of baryons
• Heavy baryon/meson ratios in relativistic heavy ion collisions
• Nucleon electromagnetic form factors from the covariant Faddeev equation
• A J^PG=1++ Charged Resonance in the Y(4260) to pi+pi- J/psi Decay?
• Interpretation of the X(3872) as a charmonium state plus an extra component due to the coupling to the meson-meson continuum
• Analysis of Y(2175) as a tetraquark state with QCD sum rules
• Lattice QCD investigation of a doubly-bottom $\bar{b}\bar{b}ud$ tetraquark with quantum numbers $I(J^P)=0(1^{+})$
• BB interactions with static bottom quarks from Lattice QCD
• QCD Sum Rules Approach to the $X,Y$ and $Z$ States
• Structure and compositeness of hadron resonances
• Evidence for charm-bottom tetraquarks and the mass dependence of heavy-light tetraquark states from lattice QCD
• Dalitz plot analysis of $B^0\to {\overline{D}}^0{\pi }^{+}{\pi }^{-}$ decays
• Evidence for diquarks in lattice QCD
• Determination of the pole position of the lightest hybrid meson candidate
• Tetraquark Interpretation of the Charged Bottomonium-like states Z_b^+-(10610) and Z_b^+-(10650) and Implications
• Evidence for the existence of $ud\bar{b}\bar{b}$ and the non-existence of $ss\bar{b}\bar{b}$ and $cc\bar{b}\bar{b}$ tetraquarks from lattice QCD
• Mixing of scalar tetraquark and quarkonia states in a chiral approach
• Comprehensive Amplitude Analysis of $\gamma \gamma \to {\pi }^{+}{\pi }^{-},{\pi }^0{\pi }^0$ and $\overline{K}K$ below 1.5 GeV
• Higher mass bottomonia
• Thermodynamics of two flavor QCD from imaginary chemical potentials
• Low-lying charmed and charmed-strange baryon states
• Phases of dense matter in compact stars
• High statistics study of the reaction $\gamma p\to p{\pi }^0\eta$
• A case for hidden $b\bar{b}$ tetraquarks based on $e^{+}{e}^{-}\to b\bar{b}$ cross section between $\sqrt{s}=10.54$ and 11.20 GeV
• Lattice study of light scalar tetraquarks with I=0,2,1/2,3/2: are sigma and kappa tetraquarks?
• Strange and nonstrange baryon spectra in the relativistic interacting quark-diquark model with a Gürsey and Radicati-inspired exchange interaction
• A Candidate for $1^{--}$ Strangeonium Hybrid
• Heavy-light diquark masses from QCD sum rules and constituent diquark models of tetraquarks
• On the size of the sigma meson and its nature
• Semileptonic decays of heavy baryons in the relativistic quark model
• On the spectral functions of scalar mesons
• Lattice QCD study of the $H$ dibaryon using hexaquark and two-baryon interpolators
• Higher Tetraquark Particles
• Interpretation of the newly observed ${\Omega }_c^0$ resonances
• ${\chi }_{c0}^{}(3915)$ As the Lightest $c\bar{c}s\bar{s}$ State
• Tetraquark operators in lattice QCD and exotic flavour states in the charm sector
• Strong decays of fully-charm tetraquarks into di-charmonia
• Analyzing doubly heavy tetra- and penta-quark states by variational method
• Strong and electromagnetic decays of the light scalar mesons interpreted as tetraquark states
• Dynamical calculation of the $\Delta \Delta$ dibaryon candidates
• Are there compact heavy four-quark bound states?
• Selected Science Opportunities for the EicC
• Light Scalar Tetraquark Mesons in the QCD Sum Rule
• Quark models of dibaryon resonances in nucleon-nucleon scattering
• Strange baryon spectroscopy in the relativistic quark model
• New ${\Omega }_c^0$ baryons discovered by LHCb as the members of $1P$ and $2S$ states
• Nature of the light scalar mesons
• Interpreting $Z_c(3900)$ and $Z_c(4025)/Z_c(4020)$ as charged tetraquark states
• Tetraquark spectroscopy
• Doubly heavy baryons in a Salpeter model with AdS/QCD inspired potential
• Newly observed exotic doubly charmed meson $T_{cc}^{+}$
• $QQ\bar{q}\bar{q}$ in a chiral constituent quark model
• Spectroscopy of the hidden-charm $[qc][\bar{q}\bar{c}]$ and $[sc][\bar{s}\bar{c}]$ tetraquarks
• A Review on Partial-wave Dynamics with Chiral Effective Field Theory and Dispersion Relation
• Study of the a_0(980) meson via the radiative decay phi->eta pi^0 gamma with the KLOE detector
• Reanalysis of the heavy baryon states ${\Omega }_b$, ${\Omega }_c$, ${\Xi }_b^{\prime }$, ${\Xi }_c^{\prime }$, ${\Sigma }_b$ and ${\Sigma }_c$ with QCD sum rules
• Diquark correlations in baryon spectroscopy and holographic QCD
• Doubly Charmed Tetraquarks in B_c and Xi_bc Decays
• Analysis of the scalar and axial-vector heavy diquark states with QCD sum rules
• Weak decay of Lambda_c^+ for the study of Lambda(1405) and Lambda(1670)
• Deciphering the nature of X(3872) in heavy ion collisions
• Role of newly discovered ${\Xi }_b(6227{)}^{-}$ for constructing excited bottom baryon family
• Simulating dense QCD matter with ultracold atomic boson-fermion mixtures
• Λ_{c} enhancement from strongly coupled quark-gluon plasma
• QCD and the Strange Baryon Spectrum
• First Measurements of Timelike Form Factors of the Hyperons, Lambda0, Sigma0, Sigma+, Xi0, Xi-, and Omega-, and Evidence of Diquark Correlations
• Masses of light tetraquarks and scalar mesons in the relativistic quark model
• Measurements of Sigma+ and Sigma- Time-like Electromagnetic Form Factors for center-of-mass energies from 2.3864 to 3.0200 GeV
• Decoding the $X(5568)$ as a fully open-flavor $su\bar{b}\bar{d}$ tetraquark state
• Dynamical study of $\mathbf{QQ}-\bar{\mathbf{u}}\bar{\mathbf{d}}$ mesons
• Understanding the internal structures of the $X(4140)$, $X(4274)$, $X(4500)$ and $X(4700)$
• Exotic Heavy Quarkonium Spectroscopy: A Mini-review
• Production of doubly charmed tetraquarks with exotic color configurations in electron-positron collisions
• Further evidence for N(1900)P_{13} from photoproduction of hyperons
• Nonrelativistic model of tetraquarks and predictions for their masses from fits to charmed and bottom meson data
• Hidden charm tetraquark states in a diquark model
• Delta and Omega electromagnetic form factors in a Dyson-Schwinger/Bethe-Salpeter approach
• Dynamical generation and dynamical reconstruction
• $D_{s0}(2317)$ as a tetraquark state with QCD sum rules in heavy quark limit
• $X_{0,1}$(2900) and $(D^{-}{K}^{+})$ invariant mass from QCD Laplace sum rules at NLO
• Lattice investigation of the scalar mesons a_0(980) and κ using four-quark operators
• Distinguishing two kinds of scalar mesons from heavy meson decays
• QCD Sum Rule Study of the Masses of Light Tetraquark Scalar Mesons
• Photoproduction of pions and properties of baryon resonances from a Bonn-Gatchina partial wave analysis
• Analysis of the Y(4140) and related molecular states with QCD sum rules
• The 2^-+ assignment for the X(3872)
• Resonant $a_0(980)$ state in triangle rescattering $D_s^{+}\to {\pi }^{+}{\pi }^0\eta$ decays
• Establishing low-lying doubly charmed baryons
• A lattice study of light scalar tetraquarks
• Estimating the mass of the hidden charm $1^{+}(1^{+})$ tetraquark state via QCD sum rules
• Heavy pentaquark spectroscopy in the diquark model
• Construction of $bb\bar{u}\bar{d}$ tetraquark states on lattice with NRQCD bottom and HISQ up/down quarks
• Z_c -like spectra from QCD Laplace sum rules at NLO
• Nucleon to Delta electromagnetic transition in the Dyson-Schwinger approach
• The BESIII Physics Programme
• The Polyakov loop and the hadron resonance gas model
• Analysis of the ${\frac{3}{2}}^{\pm }$ pentaquark states in the diquark-diquark-antiquark model with QCD sum rules
• Diquark correlations in baryons on the lattice with overlap quarks
• Hadronic D decays involving even-parity light mesons
• Analysis of the vertexes ${\Xi }_Q^{\ast }{\Xi }_Q^{\prime }V$, ${\Sigma }_Q^{\ast }{\Sigma }_{Q}V$ and radiative decays ${\Xi }_Q^{\ast }\to {\Xi }_Q^{\prime }\gamma$, ${\Sigma }_Q^{\ast }\to {\Sigma }_Q\gamma$
• Diquark and light four-quark states
• $K_0^{\ast }(800)$ as a companion pole of $K_0^{\ast }(1430)$
• Analysis of the light-flavor scalar and axial-vector diquark states with QCD sum rules
• Comparison of gluon flux-tube distributions for quark-diquark and quark-antiquark hadrons
• Dispersive $\pi K\to \pi K$ and $\pi \pi \to K\bar{K}$ amplitudes from scattering data, threshold parameters and the lightest strange resonance $\kappa$ or $K_0^{\ast }(700)$
• Mass spectra for $qc\bar{q}\bar{c}$, $sc\bar{s}\bar{c}$, $qb\bar{q}\bar{b}$, $sb\bar{s}\bar{b}$ tetraquark states with $J^{PC}=0^{++}$ and $2^{++}$
• Weak Decays of Stable Doubly Heavy Tetraquark States
• Strong evidence for nucleon resonances near 1900\,MeV
• Spectroscopy of Exotic Hadrons Formed from Dynamical Diquarks
• Nucleon resonances in the fourth resonance region
• AdS-QCD quark-antiquark potential, meson spectrum and tetraquarks
• Vector hidden-bottom tetraquark candidate: $Y(10750)$
• Analysis the $0^{++}$ nonet mesons as four-quark states with the QCD sum rules
• Non-linear Regge trajectories with AdS/QCD
• Determination of exotic hadron structure by constituent-counting rule for hard exclusive processes
• Four-quark states with charm quarks in a two-body Bethe-Salpeter approach
• Further study of the $N\Omega$ dibaryon within constituent quark models
• New charged resonance $Z_c^{-}(4100)$: the spectroscopic parameters and width
• Hidden charm pentaquark states in a diquark model
• Searching for an Attractive Force in Holographic Nuclear Physics
• Four-quark states from functional methods
• Exploring the resonances $X(4140)$ and $X(4274)$ through their decay channels
• Search for the possible S=+1 Pentaquark states in Quenched Lattice QCD
• Open-flavor charmed/bottom $sq\bar{q}\bar{Q}$ and $qq\bar{q}\bar{Q}$ tetraquark states
• $J^P$ Assignments of ${\Lambda }_c^{+}$ Baryons
• Strong decays of heavy baryons in Bethe-Salpeter formalism
• Production cross sections of hyperons and charmed baryons from $e^{+}{e}^{-}$ annihilation near $\sqrt{s}=10.52$~GeV
• Search for $\bar{b}\bar{b}us$ and $\bar{b}\bar{c}ud$ tetraquark bound states using lattice QCD
• Probabilities in nonorthogonal basis: Four--quark systems
• Fine Structure of Pentaquark Multiplets in the Dynamical Diquark Model
• Charmonium and Charmoniumlike States at the BESIII Experiment
• Structure of the axial-vector meson $D_{s1}(2460)$ and the strong coupling constant $g_{D_{s1}{D}^{\ast }K}$ with the light-cone QCD sum rules
• Tetraquark Spectroscopy: A Symmetry Analysis
• Structure of the $D_{s0}(2317)$ and the strong coupling constant $g_{D_{s0}DK}$ with the light-cone QCD sum rules
• Possible $H$-like dibaryon states with heavy quarks
• Radiative decays of the $D_{s0}(2317)$, $D_{s1}(2460)$ and the related strong coupling constants
• A Three-Flavor Chiral Effective Model with Four Baryonic Multiplets within the Mirror Assignment
• Tomography of exotic hadrons in high-energy exclusive processes
• Sigma meson in pole-dominated QCD sum rules
• Another tetraquark structure in the ${\pi }^{+}{\chi }_{c1}$ invariant mass distribution
• Lattice QCD study of four-quark components of the isosinglet scalar mesons: Significance of disconnected diagrams
• Lifetimes of singly charmed hadrons
• Application of the QCD light cone sum rule to tetraquarks: the strong vertices $X_b{X}_b\rho$ and $X_c{X}_c\rho$
• On the two-photon decay width of the sigma meson
• Color Non-Singlet Spectroscopy
• Study on the strong decays of $\varphi (2170)$ and a grand expectation for the future charm-tau factory
• Spectroscopy of all charm tetraquark states
• Analysis the $f_0(980)$ and $a_0(980)$ mesons as four-quark states with the QCD sum rules
• Hints for the existence of hexaquark states in the baryon-antibaryon sector
• Study of Doubly Heavy Baryon Spectrum via QCD Sum Rules
• Diquark effects in light baryon correlators from lattice QCD
• Rare ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ and ${\Lambda }_b\to \Lambda \gamma$ decays in the relativistic quark model
• The Status of ${\Xi }_{cc}^{++}$ Baryon: investigating quark-diquark model
• Nature of the vector resonance $Y(2175)$
• Going in quest of potential tetraquark interpretations for the newly observed $T_{\psi \psi }$ states in light of the diquark-antidiquark scenarios
• Contributions of $K_0^{\ast }(1430)$ and $K_0^{\ast }(1950)$ in the three-body decays $B\to K\pi h$
• Gravitational form factors and angular momentum densities in light-front quark-diquark model
• From Pentaquarks to Dibaryons in Lambda_b(5620) decays
• Regge-like relation and a universal description of heavy-light systems
• Relativistic quark-diquark model of baryons with a spin-isospin transition interaction
• Ground state baryons in the flux-tube three-body confinement model using Diffusion Monte Carlo
• Instanton interpolating current for $\sigma$--tetraquark
• Hexaquark picture for $d^{\ast }(2380)$
• Continuity from neutron matter to two-flavor quark matter with ${}^1{S}_0$ and ${}^3{P}_2$ superfluidity
• Doubly heavy tetraquark states $cc\bar{u}\bar{d}$ and $bb\bar{u}\bar{d}$
• Diquark properties from full QCD lattice simulations
• Chiral effective theory of diquarks and the U_A(1) anomaly
• Diquark mass differences from unquenched lattice QCD
• Spectrum of singly heavy baryons from a chiral effective theory of diquarks
• Mass spectrum of the scalar hidden charm and bottom tetraquark states
• Mass spectrum of the axial-vector hidden charmed and hidden bottom tetraquark states
• Heavy exotic scalar meson $T_{bb;\bar{u}\bar{s}}^{-}$
• Heavy baryon spectrum with chiral multiplets of scalar and vector diquarks
• Mirror versus naive assignment in chiral models for the nucleon
• Coupling of \bar K*N to the Lambda(1520)
• B_c^+- decays into tetraquarks
• The Scalar Hexaquark $uuddss$: a Candidate to Dark Matter?
• Decoding the double heavy tetraquark state $T_{cc}^{+}$
• Semileptonic and nonleptonic decays of the axial-vector tetraquark $T_{bb;\overline{u}\overline{d}}^{-}$
• Tetraquarks as Diquark Antidiquark Bound Systems
• Strong decays of the higher isovector scalar mesons
• Beautiful mathematics for beauty-full and other multi-heavy hadronic systems
• Lattice QCD investigation of the structure of the $a_0(980)$ meson
• Settling the $Z_c(4600)$ in the charged charmonium-like family
• Doubly charm tetraquark channel with isospin $1$ from lattice QCD
• Mass spectrum of the vector hidden charm and bottom tetraquark states
• Diquarks: a QCD sum rule perspective
• Tetraquark mixing framework for isoscalar resonances in light mesons
• Baryon modes in string breaking from gauge/string duality
• Analysis of the scalar nonet mesons with the QCD sum rules
• Production of Charmed Tetraquarks from $B_c$ and $B$ decays
• String Breaking, Baryons, Medium, and Gauge/String Duality
• Search for a Narrow Baryonic Resonance Decaying to $K_s^{0}p$ or $K_s^0\bar{p}$ in Deep Inelastic Scattering at HERA
• Reanalysis of the mass spectrum of the scalar hidden charm and hidden bottom tetraquark states
• Exploring the magnetic dipole moments of $T_{QQ\bar{q}\bar{s}}$ and $T_{QQ\bar{s}\bar{s}}$ states in the framework of QCD light-cone sum rules
• Analysis of the X(1576) as a tetraquark state with the QCD sum rules
• Sign ambiguity in the K Sigma channel
• Testing the tetraquark structure for the $X$ resonances in low-lying region
• Recent progress on the study of the charmoniumlike states
• Doubly heavy tetraquark bound and resonant states
• Revisit the $X(4274)$ as the axialvector tetraquark state
• Conformal symmetry and light flavor baryon spectra
• Does nuclear matter bind at large $N_c$?
• Stable scalar tetraquark $T_{bb;\bar{u}\bar{d}}^{-}$
• Light scalar tetraquarks from a holographic perspective
• Holographic stability for non-$q\bar{q}$ candidates
• Axial Vector $cc$ and $bb$ Diquark Masses from QCD Laplace Sum-Rules
• Scalar-involved three-point Green functions and their phenomenology
• The structure, mixing angle, mass and couplings of the light scalar $f_0(500)$ and $f_0(980)$ mesons
• Investigation of light and heavy tetraquark candidates using lattice QCD
• A QCD sum rule study of the light scalar mesons
• Comments on Diquarks, Strong Binding and a Large Hidden QCD Scale
• Further signatures to support the tetraquark mixing framework for the two light-meson nonets
• Semileptonic decays of the scalar tetraquark $Z_{bc;\overline{u}\overline{d}}^0$
• Quark confinement potential examined by excitation energy of the Lambda_c and Lambda_b baryons in a quark-diquark model
• $d^{\ast }(2380)$ and its partners in a diquark model
• A QCD sum rule analysis of the pentaquark
• Possible signatures for tetraquarks from the decays of $a_0(980)$, $a_0(1450)$
• Some Properties of the $QQq$-Quark Potential in String Models
• Structure of Light Scalar Mesons from D_s and D^0 Non-Leptonic Decays
• Counting valence quarks at RHIC and LHC
• Weak Decays of Triply Heavy Tetraquarks $b\bar{c}b\bar{q}$
• Excitation energy spectra of the Lambda_c and Lambda_b baryons in a finite-size diquark model
• Analysis of the scalar doubly heavy tetraquark states with QCD sum rules
• Four-quark structure of the excited states of heavy mesons
• Strong isospin symmetry breaking in light scalar meson production
• Charmed Baryon ${\Lambda }_c$ in Nuclear Matter
• Exotic hadron production in quark combination model
• SUSY with R-symmetry: confronting EW precision observables and LHC constraints
• D and D_s in mass loaded flux tube
• X(1576) as Diquark-Antidiquark Bound State
• Baryons in the light-front approach: The three-quark picture
• 70 Years of Hyperon Spectroscopy: A review of strange $\Xi$, $\Omega$ baryons, and the spectrum of charmed and bottom baryons
• A new method to study the number of colors in the final-state interactions of hadrons
• Resonance $X(3960)$ as a hidden charm-strange scalar tetraquark
• Four-quark stability
• Weak Decays of Doubly-Heavy Tetraquarks $b\bar{c}q\bar{q}$
• Testing the tetraquark mixing framework from QCD sum rules for $a_0(980)$
• How tetraquarks can generate a second chiral phase transition
• Tetraquark states in the bottom sector and the status of the $Y_b$(10890) state
• A note on large N scalar QCD_2
• Quark-diquark potential and diquark mass from Lattice QCD
• Measurement of $\Lambda$ transverse polarization in $e^{+}{e}^{-}$ collisions at $\sqrt{s}=3.68-3.71$ GeV
• Resonance $X(4630)$
• Comparative Regge analysis of $\Lambda ,{\Sigma }^0,\Lambda (1520)$ and ${\Theta }^{+}$ production in $\gamma p$, $\pi p$ and $pp$ reactions
• Configurational entropy of heavy-quark QCD exotica: engendering the next generation
• Decay modes of the scalar exotic meson $T_{bs;\overline{u}\overline{d}}^{-}$
• Spin-1 diquark contributing to the formation of tetraquarks in light mesons
• Light and heavy multiquark spectroscopy
• QCD quark cyclobutadiene and light tetraquark spectrum
• Charmonium possibility of X(3872)
• Investigating efficient methods for computing four-quark correlation functions
• Resonance $X(5568)$ as an exotic axial-vector state
• Quark Structure of the Nucleon and Angular Asymmetry of Proton-Neutron Hard Elastic Scattering
• Hidden-flavor pentaquarks
• XYZ States: Theory Overview
• Analysis of the nonet scalar mesons as tetraquark states with new QCD sum rules
• Possible bound state of the double heavy meson-baryon system
• Regge trajectories for the heavy-light diquarks
• Observation of ${\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+}$ and Evidence for $\Sigma (1380{)}^{+}$ in ${\Lambda }_c^{+}\to \Lambda {\pi }^{+}\eta$
• Decay properties of the $Z_c(3900)$ through the Fierz rearrangement
• Chiral Structure of Vector and Axial-Vector Tetraquark Currents
• P-wave fully charm and fully bottom tetraquark states
• Ordinary and exotic mesons in the extended Linear Sigma Model
• The "Closed" Chiral Symmetry and Its Application to Tetraquark
• The strong decays of the light scalar mesons $f_0(500)$ and $f_0(980)$
• Search for Baryonic Resonances Decaying to Xi pi in Deep-Inelastic Scattering at HERA
• Probing an axial-vector tetraquark $Z_s$ via its semileptonic decay $Z_s\to X(4274)\overline{l}{\nu }_l$
• Scalar mesons in the chiral theory with quark degrees of freedom
• Substructure of Multiquark Hadrons (Snowmass 2021 White Paper)
• Towards the understanding of heavy quarks hadronization: from leptonic to heavy-ion collisions
• Regge trajectories for the light diquarks
• Strong decays of singly heavy baryons from a chiral effective theory of diquarks
• Compositeness of hadrons, nuclei, and atomic systems
• Models and Potentials in Hadron Spectroscopy
• Theoretical study of the Lambda(1405) resonance in Xi_b^0 -> D^0 pi Sigma decay
• Determination of the up/down-quark mass within QCD sum rules in the scalar channel
• Doubly charmed hexaquarks in the diquark picture
• Lattice study of $cc\bar{u}\bar{s}$ tetraquark channel in $D^{(\ast )}{D}_s^{(\ast )}$ scattering
• The Fractured Boer-Mulders Effect in the Production of Polarized Baryons
• Magnetic moment of $X_Q$ state with $J^{PC}=1^{+\pm }$ in light cone QCD sum rules
• Chiral Dynamics of the Polarizing Fracture Functions for Baryon Production
• The $\rho -\omega$ splitting in constituent quark models
• Hadron properties from QCD bound-state equations: A status report
• QCD sum rule study on the $f_0(980)$ structure as a pure $K\bar{K}$ bound state
• An interacting quark-diquark model. Strange and nonstrange baryon spectroscopy and other observables
• Dynamical study of the light scalar mesons below 1 GeV in a flux-tube model
• Hamiltonian, Path Integral and BRST Formulations of Large N Scalar $QC{D}_2$ on the Light-Front and Spontaneous Symmetry Breaking
• Regge trajectory relation for the universal description of the heavy-heavy systems: diquarks, mesons, baryons and tetraquarks
• Observation and branching fraction measurement of the decay ${\Xi }_b^{-}\to {\Lambda }_b^0{\pi }^{-}$
• Hunting for the prospective $T_{cc}$ family based on the diquark-antidiquark configuration
• Fully charmed P-wave tetraquark resonant states in the quark model
• $P$-wave states $T_{bb}^{-}$ from diquarks
• $\lambda$ and $\rho$ Regge trajectories for hidden bottom and charm tetraquarks $(Qq)(\bar{Q}{\bar{q}}^{\prime })$
• Tetraquark mixing supported by the partial decay widths of two light-meson nonets
• A diquark model for the d*(2380) dibaryon resonance?
• Chiral Structure of Scalar and Pseudoscalar Mesons
• Tetraquark mass relations in quark and diquark models
• Sum rule for the partial decay rates of bottom hadrons based on the dynamical supersymmetry of the $\bar{s}$ quark and the $ud$ diquark
• Systematic study of pentaquark states: $qqq-q\bar{q}$ configuration
• A study on the correlation between poles and cuts in $\pi \pi$ scattering
• SU(6), Triquark states, and the pentaquark
• Fully-heavy tetraquarks in the vacuum and in a hot environment
• Revisiting light-flavor diquarks in the inverse matrix method of QCD sum rules
• Positive parity pentaquark towers in large Nc QCD
• Two-Loop QCD Renormalization and Anomalous Dimension of the Scalar Diquark Operator
• Building diquark model from Lattice QCD
• $S$-wave contributions to the $B_{(s)}\to {\chi }_{c1}(\pi \pi ,K\pi ,KK)$ decays
• Baryonic susceptibilities, quark-diquark models, and quark-hadron duality at finite temperature
• Polarization observables in double neutral pion photoproduction
• Particle Yields and Ratios within Equilibrium and Non-Equilibrium Statistics
• Excitation spectra of heavy baryons in diquark models
• Elliptical flow coalescence to identify the $f_0$(980) content
• More on heavy tetraquarks in lattice QCD at almost physical pion mass
• Exploring S-Wave Threshold Effects in QCD: A Heavy-Light Approach
• Testing the light scalar meson as a non-$q\bar{q}$ state in semileptonic $D$ decays
• Faddeev calculation of pentaquark ${\Theta }^{+}$ in the Nambu-Jona-Lasinio model-based diquark picture
• The Relativistic Cornell-type Mechanism of Exotic Scalar Resonances
• Light tetraquark states with the exotic quantum number $J^{PC}=3^{-+}$
• Hadrons and Few-Body Physics
• The possible assignments of the scalar $K_0^{\ast }(1950)$ and $K_0^{\ast }(2130)$ within the ${}^3{P}_0$ model
• Dynamical supersymmetry for strange quark and $ud$ antidiquark in hadron mass spectrum
• Elliptic anisotropy measurement of the f${}_0$(980) hadron in proton-lead collisions and evidence for its quark-antiquark composition
• Are compact open-charm tetraquarks consistent with recent lattice results?
• Measurement of ${\Sigma }^{+}$ transverse polarization in $e^{+}{e}^{-}$ collisions at $\sqrt{s}=3.68-3.71$ GeV
• Exclusive semileptonic decays of $D$ and $D_s$ mesons into orbitally and radially excited states of strange and light mesons
• Quark-diquark Systematics of Baryons: Spectral Integral Equations for Systems Composed by Light Quarks
• Investigating different structures for the $X(3872)$
• Nature of $X(2370)$
• Molecular and compact four-quark states
• Newly observed $\kappa$(2600) and the highly excited states of the $K_0^{\ast }$ family
• Study on the Form Factors at Effective Vertices of Diqarks Interacting with Gauge Bosons
• $\lambda$ and $\rho$ Regge trajectories for bottom-charm tetraquarks $(bq)(\bar{c}{\bar{q}}^{\prime })$ and $(cq)(\bar{b}{\bar{q}}^{\prime })$
• Quark-diquark string tension, excited baryonic resonances and thermal fluctuations
• Exotic Heavy Hadrons
• Charmed baryon in a string model
• Chiral effective theory of scalar and vector diquarks revisited
• Dynamics of Multiquark Systems: Mass, Width and Exotics
• $\lambda$ and $\rho$ Regge trajectories for the pentaquark $P_{cc\bar{c}bb}$ in the diquark-triquark picture
• Physical Implications of the Extrapolation and Statistical Bootstrap of the Nucleon Structure Function Ratio $\frac{F_2^n}{F_2^p}$ for Mirror Nuclei ${}^3$He and ${}^3$H
• Quantum Numbers of the Pentaquark States $P_c^{+}$ via Symmetry Analysis
• Rescattering-induced $D\to SS$ weak decays
• Mass spectrum, magnetic moments and Regge trajectories of ${\Omega }_{ccb}$ and ${\Omega }_{cbb}$ baryons in the nonrelativistic quark--diquark model
• An interpretation of scalars in SO(32)
• Quantum Number Density Asymmetries Within QCD Jets Correlated With Lambda Polarization
• Random statistical analysis of transverse momentum spectra of strange particles and dependence of related parameters on centrality in high energy collisions at the LHC
• Diquark correlations in baryons: the Interacting Quark Diquark Model
• Quark-model hadron structure
• P-wave Pentaquark and its Decay in the Quark Model with Instanton Induced Interaction
• Light scalars as tetraquarks: decays and mixing with quarkonia
• On the existence of exotic and non-exotic multiquark meson states
• Heavy-flavor multimodal fragmentation to $S$-wave pentacharms at next-generation hadron colliders
• Spin polarization of $\Lambda$ hyperons in $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$ at BESIII
• Observation of ${\Lambda }_b^0\to D^{+}p{\pi }^{-}{\pi }^{-}$ and ${\Lambda }_b^0\to D^{\ast +}p{\pi }^{-}{\pi }^{-}$ decays
• Quark-diquark models and baryonic fluctuations in QCD
• Strange and nonstrange baryon spectra in the interacting quark-diquark model
• Transition form factors for $D/B$ to $a_0(980)$ from light-cone QCD sum rules
• Observation of ${\Lambda }_c^{+}\to n{\pi }^{+}\eta$ and search for ${\Lambda }_c^{+}\to n{a}_0(980{)}^{+}$
• Discovery of XYZ particles at the BESIII Experiment
• Prospects for compact hexaquarks under the limitation imposed by quark confinement
• Phenomenological mass model for exotic hadrons and predictions for masses of non-strange dibaryons as hexaquarks