The $XYZ$ states: experimental and theoretical status and perspectives

Abstract

The quark model was formulated in 1964 to classify mesons as bound states made of a quark-antiquark pair, and baryons as bound states made of three quarks. For a long time all known mesons and baryons could be classified within this scheme. Quantum Chromodynamics (QCD), however, in principle also allows the existence of more complex structures, generically called exotic hadrons or simply exotics. These include four-quark hadrons (tetraquarks and hadronic molecules), five-quark hadrons (pentaquarks) and states with active gluonic degrees of freedom (hybrids), and even states of pure glue (glueballs). Exotic hadrons have been systematically searched for in numerous experiments for many years. Remarkably, in the past fifteen years, many new hadrons that do not exhibit the expected properties of ordinary (not exotic) hadrons have been discovered in the quarkonium spectrum. These hadrons are collectively known as $XYZ$ states. Some of them, like the charged states, are undoubtedly exotic. Parallel to the experimental progress, the last decades have also witnessed an enormous theoretical effort to reach a theoretical understanding of the $XYZ$ states. Theoretical approaches include not only phenomenological extensions of the quark model to exotics, but also modern non-relativistic effective field theories and lattice QCD calculations. The present work aims at reviewing the rapid progress in the field of exotic $XYZ$ hadrons over the past few years both in experiments and theory. It concludes with a summary on future prospects and challenges.

178 pages, 106 figures; updated/accepted version to appear in Physics Reports

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• Observation of a charged charmoniumlike structure in $e^{+}{e}^{-}\to (D^{\ast }{\bar{D}}^{\ast }{)}^{\pm }{\pi }^{\mp }$ at $\sqrt{s}=4.26$GeV
• Consequences of Heavy Quark Symmetries for Hadronic Molecules
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• Fine Structure of the QCD String Spectrum
• Charmonium levels near threshold and the narrow state $X(3872) \to π^{+}π^{-}\jpsi$
• Hadro-Charmonium
• Observation of a near-threshold enhancement in the e+e- -->Lambda_c+Lambda_c- cross section using initial-state radiation
• Higher Quarkonia
• Toward the excited meson spectrum of dynamical QCD
• Heavy quark spin structure in Z_b resonances
• Precise measurement of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ cross section at center-of-mass energies from 3.77 to 4.60 GeV
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• Quark mass relations to four-loop order
• The X(3872) boson: Molecule or charmonium
• Charmonium Decays of $Y(4260), psi(4160), and psi(4040)
• The HQET/NRQCD Lagrangian to order alpha/m^3
• Observation of a new charmonium state in double charmonium production in e+ e- annihilation at \sqrt{s} ~ 10.6 GeV
• Gluonic charmonium resonances at BaBar and Belle?
• The Production and Decay of Hybrid Mesons by Flux-Tube Breaking
• NNLO Corrections to Nucleon-Nucleon Scattering and Perturbative Pions
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• Analysis of the Quantum Numbers $J^{PC}$ of the X(3872) Particle
• Pion Interactions in the X(3872)
• Energy dependence of the ρ resonance in ππ elastic scattering from lattice QCD
• Static potentials and glueball masses from QCD simulations with Wilson sea quarks
• Aharonov-Bohm effect and nucleon-nucleon phase shifts on the lattice
• Three-loop static potential
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• Masses of heavy tetraquarks in the relativistic quark model
• Coupled $\pi \pi ,K\overline{K}$ scattering in $P$-wave and the $\rho$ resonance from lattice QCD
• The Heavy Quark Spin Symmetry Partners of the X(3872)
• Observation of $e^{+}{e}^{-}\to \gamma X(3872)$ at BESIII
• The Upsilon spectrum and m_b from full lattice QCD
• The infrared behaviour of the static potential in perturbative QCD
• Are Y(4260) and {\rm Z${}_2^{+}$(4250)} ${\mathrm{D}}_1\mathrm{D}$ or ${\mathrm{D}}_0{\mathrm{D}}^{\ast }$ Hadronic Molecules?
• Rigorous QCD Predictions for Decays of P-Wave Quarkonia
• Evidence for the decay X(3872) --> J/psi omega
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• Study of doubly heavy tetraquarks in Lattice QCD
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• The Possible Interpretations of Y(4260)
• Three particles in a finite volume
• Born-Oppenheimer Approximation for the XYZ Mesons
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• Three-particle scattering amplitudes from a finite volume formalism
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• Unitarized Chiral Perturbation Theory in a finite volume: scalar meson sector
• Two Particle States and the $S$-matrix Elements in Multi-channel Scattering
• A method to measure the antikaon-nucleon scattering length in lattice QCD
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• Effective Field Theory Lagrangians for Baryons with Two and Three Heavy Quarks
• Electromagnetic Splittings and Light Quark Masses in Lattice QCD
• New states above charm threshold
• Search for the Z(4430)^- at BABAR
• Resonances in coupled πK,ηK scattering from quantum chromodynamics
• A Discussion on Triangle Singularities in the ${\Lambda }_b\to J/\psi K^{-}p$ Reaction
• Three-body Unitarity in the Finite Volume
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• Leading isospin breaking effects on the lattice
• The coupled-channel scattering on a torus
• Evidence for the decay $X(3872)\to \psi (2S)\gamma$
• Observation of the bottomonium ground state in the decay Upsilon(3S) -> gamma eta_b
• Nonperturbative determination of the QCD potential at O(1/m)
• Precision measurement of the integrated luminosity of the data taken by BESIII at center of mass energies between 3.810 GeV and 4.600 GeV
• Heavy meson masses and decay constants from relativistic heavy quarks in full lattice QCD
• Lattice QCD Calculation of the $\rho$ Meson Decay Width
• Precision tests of the J/ψ from full lattice QCD: mass, leptonic width and radiative decay rate to η_c
• Precise heavy-light meson masses and hyperfine splittings from lattice QCD including charm quarks in the sea
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• Hadronic molecule structure of the Y(3940) and Y(4140)
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• Resonances in coupled $\pi K,\eta K$ scattering from lattice QCD
• Gluon excitations of the static quark potential and the hybrid quarkonium spectrum
• Light Flavour and Heavy Quark Spin Symmetry in Heavy Meson Molecules
• The QCD Potential at $O(1/m)$
• Three-particle quantization condition in a finite volume: 1. The role of the three-particle force
• The Y(3940), Z(3930) and the X(4160) as dynamically generated resonances from the vector-vector interaction
• Lattice QCD and Three-particle Decays of Resonances
• Production of the X(3872) at the Tevatron and the LHC
• Resonance properties from the finite-volume energy spectrum
• Evidence for exotic hadron contributions to ${\Lambda }_b^0\to J/\psi p{\pi }^{-}$ decays
• Hadron Loops: General Theorems and Application to Charmonium
• Study of Resonances in Exclusive B Decays to Dbar(*)D(*)K
• An $a_0$ resonance in strongly coupled $\pi \eta$, $K\overline{K}$ scattering from lattice QCD
• The Upsilon spectrum and the determination of the lattice spacing from lattice QCD including charm quarks in the sea
• Bound state nature of the exotic Z_b states
• Measurement of the X(3872) production cross section via decays to J/psi pi pi in pp collisions at sqrt(s) = 7 TeV
• Coupled-Channel $D\pi$, $D\eta$ and $D_s\bar{K}$ Scattering from Lattice QCD
• Evidence for X(3872) from DD* scattering on the lattice
• D Pi scattering and D meson resonances from lattice QCD
• Observation of $X(3872)\to J/\psi \gamma$ and search for $X(3872)\to {\psi }^{\prime }\gamma$ in B decays
• Observation of a charmonium-like enhancement in the gamma gamma --> omega J/psi process
• Observation of a peaking structure in the J/psi phi mass spectrum from B(+/-) to J/psi phi K(+/-) decays
• Fragmentation, NRQCD and NNLO Factorization Analysis in Heavy Quarkonium Production
• QCD phenomenology of static sources and gluonic excitations at short distances
• Coupled-channel analysis of the possible $D^{(\ast )}{D}^{(\ast )}$, ${\bar{B}}^{(\ast )}{\bar{B}}^{(\ast )}$ and $D^{(\ast )}{\bar{B}}^{(\ast )}$ molecular states
• Excited heavy tetraquarks with hidden charm
• Isospin breaking effects in the X(3872) resonance
• Radiative transitions from Upsilon(5S) to molecular bottomonium
• Rummukainen-Gottlieb's formula on two-particle system with different mass
• Effect of charmed meson loops on charmonium transitions
• Measurement of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (2S)$ via Initial State Radiation at Belle
• Line Shapes of the X(3872)
• Electromagnetic mass splittings of the low lying hadrons and quark masses from 2+1 flavor lattice QCD+QED
• Charmed Tetraquarks Tcc and Tcs from Dynamical Lattice QCD Simulations
• Amplitude analysis of $B^{+}\to J/\psi \varphi K^{+}$ decays
• Potential NRQCD and Heavy-Quarkonium Spectrum at Next-to-Next-to-Next-to-Leading Order
• Production of the X(3872) in charmonia radiative decays
• $Z_b$ and $Z_c$ Exotic States as Coupled Channel Cusps
• Three-body spectrum in a finite volume: the role of cubic symmetry
• Heavy-quark spin and flavour symmetry partners of the X(3872) revisited: what can we learn from the one boson exchange model?
• Study of $e^{+}{e}^{-}\to \omega {\chi }_{cJ}$ at center-of-mass energies from 4.21 to 4.42 GeV
• Photoproduction of hidden charm pentaquark states $P_c^{+}(4380)$ and $P_c^{+}(4450)$
• Exotic tetraquark states with the $qq\bar{Q}\bar{Q}$ configuration
• A J^PG=1++ Charged Resonance in the Y(4260) to pi+pi- J/psi Decay?
• An explanation of Belle states Z_b(10610) and Z_b(10650)
• Evidence for a new resonance and search for the Y(4140) in $\gamma \gamma \to \varphi J/\psi$
• Reinterpreting several narrow `resonances' as threshold cusps
• $\rho$ Meson Decay in 2+1 Flavor Lattice QCD
• Interpretation of the X(3872) as a charmonium state plus an extra component due to the coupling to the meson-meson continuum
• Strange Hadronic Loops of the Proton: A Quark Model Calculation
• Isoscalar $\pi \pi ,K\overline{K},\eta \eta$ scattering and the $\sigma ,f_0,f_2$ mesons from QCD
• Infrared Renormalization Group Flow for Heavy Quark Masses
• Quarkonium Hybrids with Nonrelativistic Effective Field Theories
• Lattice QCD investigation of a doubly-bottom $\bar{b}\bar{b}ud$ tetraquark with quantum numbers $I(J^P)=0(1^{+})$
• Scalar mesons moving in a finite volume and the role of partial wave mixing
• Fate of the Tetraquark Candidate Zc(3900) from Lattice QCD
• Restoration of chiral and $U(1{)}_A$ symmetries in excited hadrons
• Could the near-threshold $XYZ$ states be simply kinematic effects?
• BB interactions with static bottom quarks from Lattice QCD
• Observation of $e^{+}{e}^{-}\to {\pi }^0{\pi }^0{h}_c$ and a neutral charmoniumlike structure $Z_c(4020{)}^0$
• Comprehensive analysis of the wave function of a hadronic resonance and its compositeness
• $\overline{\mathrm{MS}}$-on-shell quark mass relation up to four loops in QCD and a general SU$(N)$ gauge group
• Heavy Quark Symmetry Predictions for Weakly Bound B-Meson Molecules
• Study of the $B\to X(3872)(\to D^{\ast 0}{\bar{D}}^0)K$ decay
• Up-, down-, strange-, charm-, and bottom-quark masses from four-flavor lattice QCD
• Prediction of an $I=1$ $D{\bar{D}}^{\ast }$ state and relationship to the claimed $Z_c(3900)$, $Z_c(3885)$
• Ultrasoft Effects in Heavy-Quarkonium Physics
• QCD Sum Rules Approach to the $X,Y$ and $Z$ States
• Exotic and excited-state radiative transitions in charmonium from lattice QCD
• Evidence for charm-bottom tetraquarks and the mass dependence of heavy-light tetraquark states from lattice QCD
• Model-independent Study of Magnetic Dipole Transitions in Quarkonium
• The Heavy Quarkonium Spectrum at Order $m{\alpha }_s^5\ln {\alpha }_s$
• $B^{-}\to K^{-}{\chi }_{c0}$ decay from charmed meson rescattering
• How the Z_c(3900) Reveals the Spectra of Quarkonium Hybrid and Tetraquark Mesons
• Hadrons with a heavy colour-adjoint particle
• The $\xi (2220)$ Revistited
• X(3872) as a molecular DD* state in a potential model
• Charmed Baryonium
• $I=1$ and $I=2$ $\pi -\pi$ scattering phase shifts from $N_{\mathrm{f}}=2+1$ lattice QCD
• The QCD potential at O(1/m^2): Complete spin-dependent and spin-independent result
• Exotic $QQ\bar{q}\bar{q}$, $QQ\bar{q}\bar{s}$ and $QQ\bar{s}\bar{s}$ states
• Lattice QCD signal for a bottom-bottom tetraquark
• Resonance parameters of the rho-meson from asymmetrical lattices
• Z_c(3900) - what is inside?
• Finite-volume spectrum of ${\pi }^{+}{\pi }^{+}$ and ${\pi }^{+}{\pi }^{+}{\pi }^{+}$ systems
• Is X(3872) a possible candidate of hybrid meson
• Evidence that the Y(4660) is a f_0(980)psi' bound state
• Measurement of the near-threshold $e^{+}{e}^{-}\to D^{(\ast )\pm }D{}^{\ast \mp }$ cross section using initial-state radiation
• Quantum numbers of the $X(3872)$ state and orbital angular momentum in its ${\rho }^{0}J\psi$ decay
• Measurement of the lifetime of the doubly charmed baryon ${\Xi }_{cc}^{++}$
• Spin-dependent potentials from lattice QCD
• Three-particle systems with resonant subprocesses in a finite volume
• Excited and exotic charmonium, $D_s$ and $D$ meson spectra for two light quark masses from lattice QCD
• A Theory of X and Z Multiquark Resonances
• Power Counting and Perturbative One Pion Exchange in Heavy Meson Molecules
• Decay channels and charmonium mass-shifts
• Reproducing the $Z_c(3900)$ structure through the initial-single-pion-emission mechanism
• The nature of $\sigma$, $\kappa$, $a_0(980)$ and $f_0(980)$
• Heavy Quarkonium Spectrum at $\mathcal{O}({\alpha }_s^5{m}_q)$ and Bottom/Top Quark Mass Determination
• Third-order Coulomb corrections to the S-wave Green function, energy levels and wave functions at the origin
• Search for the X(4140) state in B+->J/psi phi K+ decays with the D0 detector
• Precision Measurement of the X(3872) Mass in J/psi pi+ pi- Decays
• Photoproduction of Exotic Baryon Resonances
• 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
• X(3872) and Y(4140) using diquark-antidiquark operators with lattice QCD
• $Y(4260)$ as the first $S$-wave open charm vector molecular state?
• Higher mass bottomonia
• The $I=1$ pion-pion scattering amplitude and timelike pion form factor from $N_{\mathrm{f}}=2+1$ lattice QCD
• Distinguishing Among Strong Decay Models
• Measurement of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (3686)$ from 4.008 to 4.600$\sim$GeV and observation of a charged structure in the ${\pi }^{\pm }\psi (3686)$ mass spectrum
• The Renormalization Group Improvement of the QCD Static Potentials
• Study of the reaction e^{+}e^{-} -->J/psiπ^{+}π^{-} via initial-state radiation at BaBar
• Hadronic Decays of the X(3872) to chi_{cJ} in Effective Field Theory
• Determination of spin and parity of the $Z_c(3900)$
• Observation of the chi_c2(2P) meson in the reaction gamma gamma -> D Dbar at BABAR
• Confirming the molecular nature of the $Z_b(10610)$ and the $Z_b(10650)$
• Doubly Heavy Baryons, Heavy Quark-DiQuark Symmetry and NRQCD
• The ${\rm Y}$ and ${{\rm Y}}^{\prime }$ Leptonic Widths, $a_{\mu }^b$ and $m_b$ from full lattice QCD
• Strange and non-strange quark mass dependence of elastic light resonances from SU(3) Unitarized Chiral Perturbation Theory to one loop
• Rho resonance parameters from lattice QCD
• Spectrum of three-body bound states in a finite volume
• $P$-wave $\pi \pi$ scattering and the $\rho$ resonance from lattice QCD
• Dynamical origin and the pole structure of X(3872)
• Isospin splittings in the light baryon octet from lattice QCD and QED
• The Search for Beauty-fully Bound Tetraquarks Using Lattice Non-Relativistic QCD
• Study of the production of ${\Lambda }_b^0$ and ${\overline{B}}^0$ hadrons in $pp$ collisions and first measurement of the ${\Lambda }_b^0\to J/\psi p{K}^{-}$ branching fraction
• Study of the X(3872) and Y(4260) in B0-->J/psi pi+ pi- K0 and B-->J/psi pi+ pi- K- decays
• J/psi gamma and psi(2S) gamma decay modes of the X(3872)
• Narrow Tetraquarks at Large N
• $Z_c(3900)$: what has been really seen?
• QCD string in light-light and heavy-light mesons
• Quarkonium spectroscopy and perturbative QCD: massive quark-loop effects
• Photoproduction of charm near threshold
• Fragmentation, Factorization and Infrared Poles in Heavy Quarkonium Production
• Heavy Quark Pair Production near Threshold with Potential Non-Relativistic QCD
• Where is the χ_{c0}(2P)?
• Implementing the three-particle quantization condition including higher partial waves
• $Z_b(10610)$ and $Z_b(10650)$ structures produced by the initial single pion emission in the ${\rm Y}(5S)$ decays
• Implications of heavy quark spin symmetry on heavy meson hadronic molecules
• Heavy Quarkonium Production at Collider Energies: Factorization and Evolution
• Confirmation of a charged charmoniumlike state $Z_c(3885{)}^{\mp }$ in $e^{+}{e}^{-}\to {\pi }^{\pm }(D{\bar{D}}^{\ast }{)}^{\mp }$ with double $D$ tag
• Study of the $Z_c^{+}$ channel using lattice QCD
• Review of Heavy Quarkonium at weak coupling
• 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
• Study of X(3915) --> J/ψω in two-photon collisions
• Two Particle States in an Asymmetric Box and the Elastic Scattering Phases
• 1S and MSbar Bottom Quark Masses from Upsilon Sum Rules
• Determination of light quark masses from the electromagnetic splitting of pseudoscalar meson masses computed with two flavors of domain wall fermions
• Precision measurement of the $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ cross section near threshold
• Observation of the $Y(4140)$ structure in the $J/\psi \varphi$ Mass Spectrum in $B^{\pm }\to J/\psi \varphi K$ cays
• Measurements of $B_c^{+}$ production and mass with the $B_c^{+}\to J/\psi {\pi }^{+}$ decay
• Spectroscopy of doubly-charmed baryons from lattice QCD
• Quarkonium Spectroscopy and Perturbative QCD: A New Perspective
• Charmonium's K2 peak
• Search for structure in the $B_s^0{\pi }^{\pm }$ invariant mass spectrum
• Study of $e^{+}{e}^{-}\to \gamma \omega J/\psi$ and Observation of $X(3872)\to \omega J/\psi$
• Evidence of a new narrow resonance decaying to ${\chi }_{c1}\gamma$ in $B\to {\chi }_{c1}\gamma K$
• Observation of $B_c^{+}\to J/\psi D_s^{+}$ and $B_c^{+}\to J/\psi D_s^{\ast +}$ decays
• Flatte-like distributions and the a_0(980)/f_0(980) mesons
• Possible S-wave Bound-States of Two Pseudoscalar Mesons
• Inclusive Decays of Heavy Quarkonium to Light Particles
• Quarkonium mass splittings in three-flavor lattice QCD
• Including heavy spin effects in the prediction of a $\bar{b}\bar{b}ud$ tetraquark with lattice QCD potentials
• Evidence of a resonant structure in the $e^{+}{e}^{-}\to {\pi }^{+}{D}^0{D}^{\ast -}$ cross section between 4.05 and 4.60 GeV
• Two-photon decays of hadronic molecules
• Evidence for the eta_b(1S) Meson in Radiative Upsilon(2S) Decay
• Three-body $D\bar{D}\pi$ dynamics for the X(3872)
• Numerical study of the relativistic three-body quantization condition in the isotropic approximation
• $\rho$ and $K^{\ast }$ resonances on the lattice at nearly physical quark masses and $N_f=2$
• Strong decays of molecular states Zc(+) and Zc'(+)
• $M({\eta }_b)$ and ${\alpha }_s$ from Nonrelativistic Renormalization Group
• Implications of Heavy Quark-Diquark Symmetry for Excited Doubly Heavy Baryons and Tetraquarks
• Mass of D*_sJ(2317) and Coupled Channel Effect
• The $\pi \pi \to \pi {\gamma }^{\star }$ amplitude and the resonant $\rho \to \pi {\gamma }^{\star }$ transition from lattice QCD
• Leading isospin-breaking corrections to pion, kaon and charmed-meson masses with Twisted-Mass fermions
• Heavy Quarkonium Hybrids: Spectrum, Decay and Mixing
• Nonperturbative corrections to the quark self-energy
• Study of e+e- => B(*) B(*)-bar pi+- at sqrt(s)=10.866 GeV
• Matching at one loop for the four-quark operators in NRQCD
• Deriving the existence of $B{\bar{B}}^{\ast }$ bound states from the X(3872) and Heavy Quark Symmetry
• Bottomonium spectrum at order v^6 from domain-wall lattice QCD: precise results for hyperfine splittings
• What can radiative decays of the X(3872) teach us about its nature?
• Tetraquark operators in lattice QCD and exotic flavour states in the charm sector
• Y(4260) and Y(4360) as mixed hadrocharmonium
• Employing spin symmetry to disentangle different models for the XYZ states
• Observation of a neutral charmoniumlike state $Z_c(4025{)}^0$ in $e^{+}{e}^{-}\to (D^{\ast }{\bar{D}}^{\ast }{)}^0{\pi }^0$
• Search for the X(4140) state in B+ to J/psi phi K+ decays
• Few-body quark dynamics for doubly-heavy baryons and tetraquarks
• Studying the P_c(4450) resonance in J/psi photoproduction off protons
• Towards a field theoretic understanding of NN->NNpi
• Amplitude analysis and the nature of the Zc(3900)
• Heavy-quark spin symmetry partners of the $X(3872)$ revisited
• Narrow Nucleon-$\psi (2S)$ Bound State and LHCb Pentaquarks
• D_{sJ}(2860) as the first radial excitation of the D_{s0}^*(2317)
• Remarks on pole trajectories for resonances
• Observation of a Neutral Structure near the $D{\bar{D}}^{\ast }$ Mass Threshold in $e^{+}{e}^{-}\to (D{\bar{D}}^{\ast }{)}^0{\pi }^0$ at $\sqrt{s}$ = 4.226 and 4.257 GeV
• Three-Loop Chromomagnetic Interaction in HQET
• D and D_s meson spectroscopy
• Measurement of the e+e- --> D0D*-pi+ cross section using initial-state radiation
• Y(4260): hadronic molecule versus hadro-charmonium interpretation
• Remarks on the $P_c$ structures and triangle singularities
• Predictions of charged charmonium-like structures with hidden-charm and open-strange channels
• Magnetic moments of the hidden-charm pentaquark states
• The QCD static energy at NNNLL
• Bottomonium in a Bethe-Salpeter-equation study
• Measurements of $\psi (2S)$ and $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}$ production in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Precision computation of hybrid static potentials in SU(3) lattice gauge theory
• Hybridized Tetraquarks
• Charm quark system at the physical point of 2+1 flavor lattice QCD
• Extraction of Hadron Interactions above Inelastic Threshold in Lattice QCD
• Interpreting the $X(5568)$
• The Y(4260) as a $J/\psi K\bar{K}$ system
• Poincare' invariance constraints on NRQCD and potential NRQCD
• Predicted charged charmonium-like structures in the hidden-charm dipion decay of higher charmonia
• The observation of light nuclei at ALICE and the X(3872) conundrum
• Tetraquark bound states in the heavy-light heavy-light system
• The Born-Oppenheimer approximation in an effective field theory language
• Energy shift of the three-particle system in a finite volume
• Production of the X(3872) in B Meson Decay by the Coalescence of Charm Mesons
• Finite volume effects in pion-kaon scattering and reconstruction of the kappa(800) resonance
• The resonant ${\pi }^{+}\gamma \to {\pi }^{+}{\pi }^0$ amplitude from Quantum Chromodynamics
• Hadro-quarkonium from Lattice QCD
• A New Look at the $Y$ Tetraquarks and ${\Omega }_c$ Baryons in the Diquark Model
• The logarithmic contribution to the QCD static energy at NNNNLO
• Interplay of quark and meson degrees of freedom in near-threshold states: A practical parametrisation for line shapes
• Generalized Lüscher Formula in Multi-channel Baryon-Meson Scattering
• Lineshapes for composite particles with unstable constituents
• Dynamics of Hadronic Molecule in One-Boson Exchange Approach and Possible Heavy Flavor Molecules
• Renormalization group improvement of the NRQCD Lagrangian and heavy quarkonium spectrum
• Extraction of the light quark mass ratio from the decays psi' --> J/psi pi^0 (eta)
• Observation of an alternative ${\chi }_{c0}(2P)$ candidate in $e^{+}{e}^{-}\to J/\psi D\bar{D}$
• The bottom-quark mass from non-relativistic sum rules at NNNLO
• New methods for B meson decay constants and form factors from lattice NRQCD
• Search for Z_c^+(3900) in the 1^+- channel on the lattice
• The bottom quark mass from the ${\rm Y}(1S)$ system at NNNLO
• Three particles in a finite volume: The breakdown of spherical symmetry
• Dynamical coupled-channel approaches on a momentum lattice
• First Observation of the Zb0(10610) in a Dalitz Analysis of Y(5S) -> Y(nS) pi0 pi0
• $ud\bar{b}\bar{b}$ tetraquark resonances with lattice QCD potentials and the Born-Oppenheimer approximation
• Decays of Zb(+) and Zb'(+) as hadronic molecules
• Quarkonium Contribution to Meson Molecules
• X(3872) in the molecular model
• Nonabelian alpha_s^3/(m_q r^2) heavy-quark-antiquark potential
• Cross section measurements of $e^{+}{e}^{-}\to \omega {\chi }_{c0}$ from $\sqrt{s}=$4.178 to 4.278 GeV
• Light meson radial Regge trajectories
• Mass and decay constant of the newly observed exotic $X(5568)$ state
• Stability of tetrons
• Decay widths of the spin-2 partners of the X(3872)
• Observation of ψ(4040) and ψ(4160) decay into ηJ/ψ
• Search for tetraquark candidate Z(4430) in meson photoproduction
• Novel Method for Precisely Measuring the $X(3872)$ Mass
• Spin structure of heavy-quark hybrids
• Low-energy Scattering of $(D{\bar{D}}^{\ast }{)}^{\pm }$ System And the Resonance-like Structure $Z_c(3900)$
• Unquenching the scalar glueball
• Finite-volume Hamiltonian method for coupled channel interactions in lattice QCD
• Chiral multiplets of excited mesons
• Model-independent determination of the gluon condensate in four-dimensional SU(3) gauge theory
• The $B_c$ mass up to order ${\alpha }_s^4$
• 1+1+1 flavor QCD + QED simulation at the physical point
• Charm-beauty meson bound states from $B(B^{\ast })D(D^{\ast })$ and $B(B^{\ast })\bar{D}({\bar{D}}^{\ast })$ interaction
• Charmonium spectroscopy and mixing with light quark and open charm states from nF=2 lattice QCD
• $D_s{D}^{\ast }$ molecule as an axial meson
• The line shapes of the $Z_b(10610)$ and $Z_b(10650)$ in the elastic and inelastic channels revisited
• The $X(3872)\to J/\psi \gamma$ decay in the $D{\bar{D}}^{\ast }$ molecular picture
• Hidden charm dynamically generated resonances and the $e^{+}{e}^{-}\to J/\psi D\bar{D}$, $J/\psi D{\bar{D}}^{\ast }$ reactions
• Observation of the $\psi (1^3{D}_2)$ state in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma {\chi }_{c1}$ at BESIII
• Evidence for an ${\eta }_c(1S){\pi }^{-}$ resonance in $B^0\to {\eta }_c(1S)K^{+}{\pi }^{-}$ decays
• Heavy Quarkonium Spectrum and Production/Annihilation Rates to order ${\beta }_0^3{\alpha }_s^3$
• Spin Dependence of Heavy Quarkonium Production and Annihilation Rates: Complete Next-to-Next-to-Leading Logarithmic result
• Deconstructing triplet nucleon-nucleon scattering
• New predictions for inclusive heavy-quarkonium P-wave decays
• Ultrasoft contribution to quarkonium production and annihilation
• Study of $B{\bar{B}}^{\ast }$ and $B^{\ast }{\bar{B}}^{\ast }$ interactions in $I=1$ and relationship to the $Z_b(10610)$, $Z_b(10650)$ states
• Systematic uncertainties of hadron parameters obtained with QCD sum rules
• Could the $X(3915)$ and the $X(3930)$ Be the Same Tensor State?
• Systematics of the HAL QCD Potential at Low Energies in Lattice QCD
• Long-range properties of $1S$ bottomonium states
• The Spin-orbit force, recoil corrections and possible $B{\bar{B}}^{\ast }$ and $D{\bar{D}}^{\ast }$ molecular states
• Coupled-Channel Effects for the Bottomonium with Realistic Wave Functions
• How the X(5568) challenges our understanding of QCD
• The Y(4260) as an omega chi_{c1} molecular state
• Is the X(3915) the chi_{c0}(2P)?
• Two-Baryon Systems with Twisted Boundary Conditions
• Decoding the $X(5568)$ as a fully open-flavor $su\bar{b}\bar{d}$ tetraquark state
• Fine and Hyperfine Splittings of Charmonium and Bottomonium: An Improved Perturbative QCD Approach
• Pionic transitions from X(3872) to chi_{cJ}
• $a_0(980)$ revisited
• Perturbative results for two and three particle threshold energies in finite volume
• Measurement of the Lifetime Difference Between B_s Mass Eigenstates
• Luminosity measurements for the R scan experiment at BESIII
• More kaonic bound states and a comprehensive interpretation of the D_{sJ} states
• Prediction of the bottomonium D-wave spectrum from full lattice QCD
• Studying the $\rho$ resonance parameters with staggered fermions
• Estimating the Production Rate of Loosely-bound Hadronic Molecules using Event Generators
• Search for the X(5568) state decaying into ${\mathrm{B}}_{\mathrm{s}}^0{\pi }^{\pm }$ in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• Role of a triangle singularity in the $\gamma p\to K^{+}\Lambda (1405)$ reaction
• Is $Z_c(3900)$ a molecular state
• Excited Charmonium Decays by Flux-Tube Breaking and the ${\psi }^{{}^{\prime }}$ Anomaly at CDF
• Isospin splittings of meson and baryon masses from three-flavor lattice QCD + QED
• Near-threshold $D\bar{D}$ spectroscopy and observation of a new charmonium state
• Nonperturbative tuning of an improved relativistic heavy-quark action with application to bottom spectroscopy
• The QCD Dynamics of Tetraquark Production
• Systematic studies of charmonium-, bottomonium-, and $B_c$-like tetraquark states
• Search for the $Z_1(4050{)}^{+}$ and $Z_2(4250{)}^{+}$ states in ${\bar{B}}^0\to {\chi }_{c1}{K}^{-}{\pi }^{+}$ and $B^{+}\to {\chi }_{c1}{K}_S^0{\pi }^{+}$
• Heavy Quarkonium Production at Collider Energies: Partonic Cross Section and Polarization
• Leptonic decay of the Upsilon(1S) meson at third order in QCD
• Observation of $e^{+}{e}^{-}\to \omega {\chi }_{c1,2}$ near $\sqrt{s}$ = 4.42 and 4.6 GeV
• The $\pi \gamma \to \pi \pi$ transition and the $\rho$ radiative decay width from lattice QCD
• $X(5568)$ and and its partner states
• Isospin splittings of doubly heavy baryons
• Study of B{+-,0} --> J/ψ K+ K- K{+-,0} and search for B0 --> J/ψ ϕ at BABAR
• Two Particle States in an Asymmetric Box
• Quark mass dependence of the X(3872) binding energy
• Dynamically-coupled partial-waves in $\rho \pi$ isospin-2 scattering from lattice QCD
• Energy scan of the $e^{+}{e}^{-}\to h_b(nP){\pi }^{+}{\pi }^{-}$ $(n=1,2)$ cross sections and evidence for ${\rm Y}(11020)$ decays into charged bottomonium-like states
• Improved determination of Heavy Quarkonium magnetic dipole transitions in pNRQCD
• Next-to-leading nonperturbative calculation in heavy quarkonium
• Remarks on the study of the X(3872) from Effective Field Theory with Pion-Exchange Interaction
• Observation of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\pi }^0{\chi }_{bJ}$ and search for $X_b\to \omega {\rm Y}(1S)$ at $\sqrt{s}\sim 10.867$ GeV
• Reconciling the X(4630) with the Y(4660)
• $M(B_c^{\ast })-M(B_c)$ Splitting from Nonrelativistic Renormalization Group
• Production of the bottom analogues and the spin partner of the X(3872) at hadron colliders
• More hidden heavy quarkonium molecules and their discovery decay modes
• Construction of energy-independent potentials above inelastic thresholds in quantum field theories
• Quark-antiquark potential with retardation and radiative contributions and the heavy quarkonium mass spectra
• Four-quark structure of Zc(3900), Z(4430) and Xb(5568) states
• Observation of the h_c(1P) using e^+e^- collisions above DDbar threshold
• New Metastable Charmonium and the ${\psi }^{\prime }$ Anomaly at CDF
• Can $X(5568)$ be described as a $B_s\pi$, $B\bar{K}$ resonant state?
• Searching for the Bottom Counterparts of X(3872) and Y(4260) via ${\pi }^{+}{\pi }^{-}{\rm Y}$
• Cusps and Exotic Charmonia
• Applying the relativistic quantization condition to a three-particle bound state in a periodic box
• Continuum bound states K-long, D_{1}(2420), D_{s1}(2536) and their partners K-short, D_{1}(2400), D*_{sJ}(2463)
• Charged charmonium-like Z+(4430) from rescattering in conventional B decays
• Heavy Quarkonia: Wilson Area Law, Stochastic Vacuum Model and Dual QCD
• Search for a new bottomonium state decaying to Upsilon(1S) pi+ pi- in pp collisions at sqrt(s) = 8 TeV
• Charm annihilation effects on the hyperfine splitting in charmonium
• Finding the $0^{--}$ Glueball
• Spectra and decays of hybrid charmonia
• First Results from The GlueX Experiment
• Width of the exotic $X_b(5568)$ state through its strong decay to $B_s^0{\pi }^{+}$
• The charm/bottom quark mass from heavy quarkonium at N${}^3$LO
• Two-flavor Simulations of the $\rho (770)$ and the Role of the $K\bar{K}$ Channel
• Hilbert Series and Operator Basis for NRQED and NRQCD/HQET
• On the Nature of X(4260)
• Observation of the decay $X(3872)\to {\pi }^0{\chi }_{c1}(1P)$
• Lattice computation of the electromagnetic contributions to kaon and pion masses
• Analysis of the $X(5568)$ as scalar tetraquark state in the diquark-antidiquark model with QCD sum rules
• Interpretations for the X(4160) observed in the double charm production at B factories
• QCD Coulomb gauge approach to hybrid mesons
• Masses of tetraquarks with open charm and bottom
• The three-quark static potential in perturbation theory
• Hadronic Loops versus Factorization in EFT calculations of $X(3872)\to {\chi }_{cJ}{\pi }^0$
• 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
• Probing the nature of Z_c states via the eta_c rho decay
• A search for the exotic meson $X(5568)$ with the Collider Detector at Fermilab
• Many-Body Coulomb Gauge Exotic and Charmed Hybrids
• Large-N Structure of Tetraquark Mesons
• Updated Cross Section Measurement of $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$ and $K_S^0{K}_S^{0}J/\psi$ via Initial State Radiation at Belle
• Observation of $e^{+}{e}^{-}\to \eta J/\psi$ at center-of-mass energy $sqrts=4.009$ GeV
• Note on X(3872) production at hadron colliders and its molecular structure
• Search for a Structure in the $B_s^0{\pi }^{\pm }$ Invariant Mass Spectrum with the ATLAS Experiment
• Isospin breaking in octet baryon mass splittings
• Connecting physical resonant amplitudes and lattice QCD
• Selected strong decay modes of Y(4260)
• Extraction of alpha_s from radiative Upsilon(1S) decays
• Bottom and Charm Mass determinations from global fits to $Q\bar{Q}$ bound states at N${}^3$LO
• Third-order non-Coulomb correction to the S-wave quarkonium wave functions at the origin
• Lüscher's finite size method with twisted boundary conditions: an application to $J/\psi$-$\varphi$ system to search for narrow resonance
• Observation of the decays ${\Lambda }_b^0\to {\chi }_{c1}p{K}^{-}$ and ${\Lambda }_b^0\to {\chi }_{c2}p{K}^{-}$
• Detailed analysis of the gluonic excitation in the three-quark system in lattice QCD
• Faddeev approach to the octet and decuplet baryons
• Masses of $D$ mesons, $D_s$ mesons and charmonium states from twisted mass lattice QCD
• Tetraquarks in the 1/N Expansion: a New Appraisal
• Charmed partner of the exotic $X(5568)$ state and its properties
• A QCD sum rule calculation of the $X^{\pm }(5568)\to B_s^0{\pi }^{\pm }$ decay width
• Leptonic and Digamma decay Properties of S-wave quarkonia states
• Production of $Y(4260)$ as a hadronic molecule state of $\bar{D}{D}_1+c.c.$ in $e^{+}{e}^{-}$ annihilations
• Resumming the color-octet contribution to radiative Upsilon decay
• Spin partners of the $Z_b(10610)$ and $Z_b(10650)$ revisited
• Chiral partner structure of doubly heavy baryons with heavy quark spin-flavor symmetry
• Lattice QCD approach to Nuclear Physics
• Consistency between Lüscher's finite volume method and HAL QCD method for two-baryon systems in lattice QCD
• Lattice study on ${\eta }_{c2}$ and X(3872)
• Analysis of the strong decay $X(5568)\to B_s^0{\pi }^{+}$ with QCD sum rules
• Predicition for the decay width of a charged state near the $D_s{\bar{D}}^{\ast }/D_s^{\ast }\bar{D}$ threshold
• Observation of ${\Xi }_c(2930{)}^0$ and updated measurement of $B^{-}\to K^{-}{\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ at Belle
• Effective field theory for the nucleon-quarkonium interaction
• Mass Spectrum of Heavy Quarkonium Hybrids
• Electromagnetic quarkonium decays at order v^7
• Comment on "Possibility of Deeply Bound Hadronic Molecules from Single Pion Exchange"
• Spectroscopy of Exotic Hadrons Formed from Dynamical Diquarks
• $P$-wave coupled-channel scattering of $B_s\pi ,B_s^{\ast }\pi ,B\overline{K},B^{\ast }\overline{K}$ and the puzzling $X(5568)$
• The Photon Spectrum in Upsilon Decays
• Effective string theory constraints on the long distance behavior of the subleading potentials
• Spin partners $W_{bJ}$ from the line shapes of the $Z_b(10610)$ and $Z_b(10650)$
• Production of charged heavy quarkonium-like states at the LHC and the Tevatron
• The Tetraquark Candidate Zc(3900) from Dynamical Lattice QCD Simulations
• Measurement of $e^{+}{e}^{-}\to D_s^{(\ast )+}{D}_s^{(\ast )-}$ cross sections near threshold using initial-state radiation
• Vector and scalar charmonium resonances with lattice QCD
• Factorized power expansion for high-$p_T$ heavy quarkonium production
• BLM-Resummation and OPE in Heavy Flavor Transitions
• Nature of the X(5568) : a critical Laplace sum rule analysis at N2LO
• Is the exotic $X(5568)$ a bound state?
• The Resummed Photon Spectrum in Radiative Upsilon Decays
• Finite volume corrections to the binding energy of the X(3872)
• The Optical Potential on the Lattice
• Lifetimes of Doubly Charmed Baryons
• Hybrid Charmonium Production in B Decays
• Strong decays of the $XYZ$ states
• Observation of the phi to pi+pi-pi+pi- Decay
• Charged charmoniumlike state $Z_c(3900{)}^{\pm }$ via meson photoproduction
• Observation of e+e- to K+K-J/psi via Initial State Radiation at Belle
• Poincare' invariance and the heavy-quark potential
• Model-independent observation of exotic contributions to $B^0\to J/\psi K^{+}{\pi }^{-}$ decays
• Relativistic Bottomonium Spectrum from Anisotropic Lattices
• Perturbative heavy quarkonium spectrum at next-to-next-to-next-to-leading order
• First observation of a baryonic $B_c^{+}$ decay
• The $\sqrt{mΛ_{QCD}$ scale in heavy quarkonium
• Lowest vector tetraquark states: $Y(4260/4220)$ or $Z_c(4100)$
• Beam Performance and Luminosity Limitations in the High-Energy Storage Ring (HESR)
• A Crucial Test for Color-Octet Production Mechanism in Z^0 Decays
• Full Formula for Heavy Quarkonium Energy Levels at Next-to-next-to-next-to-leading Order
• Gluonic excitation of non-exotic hybrid charmonium from lattice QCD
• Colour field densities of the quark-antiquark excited flux tubes in SU(3) lattice QCD
• Search for exclusive photoproduction of Z${}_c^{\pm }$(3900) at COMPASS
• Suppression of the S-wave production of (3/2)^+ + (1/2)^- heavy meson pairs in e^+e^- annihilation
• Can $X(5568)$ be a tetraquark state?
• Relations between Heavy-light Meson and Quark Masses
• Covariant Helicity-Coupling Amplitudes: A New Formulation
• From the Kappa via the Ds0*(2317) to the chi_c0: connecting light and heavy scalar mesons
• Selection Rules for Hadronic Transitions of XYZ Mesons
• Measurements of the ${\rm Y}(10860)$ and ${\rm Y}(11020)$ resonances via $\sigma (e^{+}{e}^{-}\to {\rm Y}(n\mathrm{S}){\pi }^{+}{\pi }^{-})$
• Magnetic and quadrupole moments of the $Z_c(3900)$
• Nucleon-nucleon interactions via Lattice QCD: Methodology --HAL QCD approach to extract hadronic interactions in lattice QCD--
• Two charged strangeonium-like structures observable in the $Y(2175)\to \varphi (1020){\pi }^{+}{\pi }^{-}$ process
• Hadronic quarkonium decays at order v^7
• Estimate of the charmed 0-- hybrid meson spectrum from quenched lattice QCD
• Electromagnetic multipole moments of the $P_c^{+}(4380)$ pentaquark in light-cone QCD
• Chiral symmetry and the string description of excited hadrons
• Chiral extrapolation of pion-pion scattering phase shifts within standard and unitarized Chiral Perturbation Theory
• Chiral Extrapolations of the $\mathbf{\rho }(770)$ Meson in ${\mathbf{N}}_{\mathbf{f}}=2+1$ Lattice QCD Simulations
• Vector tetraquark state candidates: $Y(4260/4220)$, $Y(4360/4320)$, $Y(4390)$ and $Y(4660/4630)$
• Hidden charm molecules in finite volume
• Evidence for $Z_c^{\pm }(3900)$ in semi-inclusive decays of $b$-flavored hadrons
• Re-examining the $X(4630)$ resonance in the reaction $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$
• The pion-pion Interaction in the rho Channel in Finite Volume
• Tetraquark-adequate formulation of QCD sum rules
• Exclusive open-charm near-threshold cross sections in a coupled-channel approach
• Improved determination of inclusive electromagnetic decay ratios of heavy quarkonium from QCD
• String Breaking in Four Dimensional Lattice QCD
• Search for muoproduction of $X(3872)$ at COMPASS and indication of a new state $\tilde{X}(3872)$
• $B_s{\pi }^{+}$ scattering and search for X(5568) with lattice QCD
• The gluonic excitation of the three-quark system in SU(3) lattice QCD
• Study of the $X^{\pm }(5568)$ state with semileptonic decays of the $B_s^0$ meson
• Is the newly reported $X(5568)$ a $B\bar{K}$ molecular state?
• Continuum limit of the $D$ meson, $D_s$ meson and charmonium spectrum from $N_f=2+1+1$ twisted mass lattice QCD
• Radiative and dilepton decays of the hadronic molecule Zc(3900)+
• Effective string theory and the long-range relativistic corrections to the quark-antiquark potential
• Measurements of the absolute branching fractions of $B^{+}\to X_{c\bar{c}}{K}^{+}$ and $B^{+}\to {\bar{D}}^{(\ast )0}{\pi }^{+}$ at Belle
• Tetraquarks in the 1/N expansion and meson-meson resonances
• Observation of ${\eta }_c(2S)\to p\bar{p}$ and search for $X(3872)\to p\bar{p}$ decays
• Asymptotic behavior of Nambu-Bethe-Salpeter wave functions for multi-particles in quantum field theories
• Precise determination of the three-quark potential in SU(3) lattice gauge theory
• Nature of the $Y(4260)$: A light-quark perspective
• Spin-dependent interactions in quarkonia
• Analysis of the $B^{+}\to J/\psi \varphi K^{+}$ data at low $J/\psi \varphi$ invariant masses and the $X(4140)$ and $X(4160)$ resonances
• Evidence of a structure in ${\bar{K}}^0{\Lambda }_c^{+}$ consistent with a charged ${\Xi }_c(2930{)}^{+}$, and updated measurement of ${\bar{B}}^0\to {\bar{K}}^0{\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ at Belle
• Search for the $X_b$ and other hidden-beauty states in the ${\pi }^{+}{\pi }^{-}{\rm Y}(1\mathrm{S})$ channel at ATLAS
• Observation of ${\Lambda }_b^0\to \psi (2S)p{K}^{-}$ and ${\Lambda }_b^0\to J/\psi {\pi }^{+}{\pi }^{-}p{K}^{-}$ decays and a measurement of the ${\Lambda }_b^0$ baryon mass
• Search of 1^P_1 charmonium in B decay
• Model-independent Study of Electric Dipole Transitions in Quarkonium
• A theoretical review of heavy quarkonium inclusive decays
• $Z_c(3900)$: Confronting theory and lattice simulations
• Analysis of the vector tetraquark states with P-waves between the diquarks and antidiquarks via the QCD sum rules
• Radiative decay Y(4260) -> X(3872) + gamma involving hadronic molecular and charmonium components
• Resonant parameters of the $Y(4220)$
• Classification of the scalar mesons: a strange pole expedition into charm and beauty territory
• Multichannel calculation for Ds* vector states and the Ds(2632) resonance
• Relation between scattering amplitude and Bethe-Salpeter wave function in quantum field theory
• Hunting for the X_b via Radiative Decays
• Relativistic model of hidden bottom tetraquarks
• Inclusive and exclusive measurements of $B$ decays to ${\chi }_{c1}$ and ${\chi }_{c2}$ at Belle
• Two-photon decay of heavy hadron molecules
• Measurement of Y(5S) decays to B^0 and B^+ mesons
• Binding energy of the $X(3872)$ at unphysical pion masses
• How Large is the Contribution of Excited Mesons in Coupled-Channel Effects?
• Status of quarkonia - like negative and positive parity states in a relativistic confinement scheme
• Determination of $m_c$ and $m_b$ from quarkonium 1S energy levels in perturbative QCD
• An alternative fit to Belle mass spectra for DD, D*D* and Lambda_C Lambda_c
• Direct X(3872) production in e+e- collisions
• Do $1^{-}c\bar{c}g$ hybrid meson exist, do they mix with charmonium ?
• Exotic vector charmonium and its leptonic decay width
• Tetraquark and two-meson states at large $N_{\mathrm{c}}$
• Gluonic Hadrons and Charmless B Decays
• Improved Perturbative QCD Approach to the Bottomonium Spectrum
• X(5568) as a $su\bar{d}\bar{b}$ tetraquark in a simple quark model
• $Z_b(10610)$ and $Z_b^{\prime }(10650)$ decays in a covariant quark model
• A Search for the LHCb Charmed 'Pentaquark' using Photo-Production of $J/\psi$ at Threshold in Hall C at Jefferson Lab
• Scattering phaseshift formulas for mesons and baryons in elongated boxes
• Higher angular momentum states of bottomonium in lattice NRQCD
• Interference effect as resonance killer of newly observed charmoniumlike states $Y(4320)$ and $Y(4390)$
• Three methods to detect the predicted $D\bar{D}$ scalar meson X(3700)
• Observation of the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay
• Charged bottomonium-like structures in the hidden-bottom dipion decays of ${\rm Y}(11020)$
• Potential NRQCD for unequal masses and the $B_c$ spectrum at NNNLO
• A very broad X(4260) and the resonance parameters of the 3D vector charmonium state
• Effective field theories for van der Waals interactions
• P-wave heavy quarkonium spectrum with next-to-next-to-next-to-leading logarithmic accuracy
• Bottomonium hyperfine splittings from lattice NRQCD including radiative and relativistic corrections
• Large Charmless Yield in B Decays and Inclusive B Decay Puzzles
• Comment on `Note on X(3872) production at hadron colliders and its molecular structure'
• Light quark mass dependence in heavy quarkonium physics
• Observation of $e^{+}{e}^{-}\to K\bar{K}J/\psi$ at center-of-mass energies from 4.189 to 4.600 GeV
• Hybrid mesons and auxiliary fields
• Search for the $Y(4140)$ via $e^{+}{e}^{-}\to \gamma \varphi J/\psi$ at $\sqrt{s}=$ 4.23, 4.26 and 4.36 GeV
• Nonperturbative evaluation of a field correlator appearing in the heavy quarkonium system
• Partial twisting for scalar mesons
• Combination of CDF and D0 results on the mass of the top quark using up to 9.7 fb${}^{-1}$ at the Tevatron
• Observation of $e^{+}{e}^{-}\to {\eta }^{\prime }J/\psi$ at center-of-mass energies between 4.189 and 4.600 GeV
• On HQET and NRQCD Operators of Dimension 8 and Above
• Free-form smearing for bottomonium and B meson spectroscopy
• The magnetic moment of the $Z_c(3900)$ as an axialvector tetraquark state with QCD sum rules
• Effective Field Theory calculations of $NN\to NN\pi$
• Radiative decays and the nature of heavy quarkonia
• Symmetries of the Three Heavy-Quark System and the Color-Singlet Static Energy at NNLL
• Semi-inclusive radiative decays of Upsilon 1S
• Comprehending Isospin breaking effects of $X(3872)$ in a Friedrichs-model-like scheme
• $B_s\pi$--$B\bar{K}$ interactions in finite volume and the $X(5568)$
• Observation of $X(3872)$ in $B\to X(3872)K\pi$ decays
• Masses of the Bottom-Charm Hybrid $\bar{b}Gc$ States
• Soft, collinear and non-relativistic modes in radiative decays of very heavy quarkonium
• Observation of $B_c^{+}\to J/\psi D^{(\ast )}{K}^{(\ast )}$ decays
• The 1P quarkonium fine splittings at NLO
• Unquenching the Quark Model and Screened Potentials
• Meson-meson interactions and Regge propagators
• Hunting for the $X_b$ via hidden bottomonium decays
• Probing the nature of $Y(4260)$ and $Z_c(3900)$ in the isospin violating process $Y(4260)\to J/\psi \eta {\pi }^0$
• Doubly Heavy Baryons and Quark-Diquark Symmetry in Quenched and Partially Quenched Chiral Perturbation Theory
• Hybrid adiabatic potentials in the QCD string model
• Low-energy Scattering of $(D^{\ast }{\bar{D}}^{\ast }{)}^{\pm }$ System and the Resonance-like Structure $Z_c(4025)$
• Mass of the bottom quark from Upsilon(1S) at NNNLO: an update
• Angular analysis of the $e^{+}{e}^{-}\to D^{(\ast )\pm }{D}^{\ast \mp }$ process near the open charm threshold using initial-state radiation
• $Z_c(4100)$ and $Z_c(4200)$ as hadrocharmonium
• Hindered M1 Radiative Decay of ${\rm Y}(2S)$ from Lattice NRQCD
• ${\eta }_{\mathrm{c}}$- and $J/\psi$-isoscalar meson bound states in the hadro-charmonium picture
• Molecular Interpretation of the Supercharmonium State Z(4475)
• Remarks on the Heavy-Quark Flavour Symmetry for doubly heavy hadronic molecules
• $Z_c(4430)$ and $Z_c(4200)$ as triangle singularities
• Recent progress on the study of the charmoniumlike states
• Excited flux tube from $q\bar{q}g$ hybrid mesons
• Next-to-leading ultrasoft running of the heavy quarkonium potentials and spectrum: Spin-independent case
• Novel implementation of the multipole expansion to quarkonium hadronic transitions
• Study of charmonium production in $b$-hadron decays and first evidence for the decay $B_s^0\to \varphi \varphi \varphi$
• Are there narrow flavor-exotic tetraquarks in large-$N_c$ QCD?
• ${\chi }_{cJ}\to e^{+}{e}^{-}$ decays revisited
• Strategies for an accurate determination of the X(3872) energy from QCD lattice simulations
• Quarkonium $h$ States As Arbiters of Exoticity
• Discovery potential for charmonium-like state Y(3940) by the meson photoproduction
• The role of hidden-charm pentaquark resonance $P_c^{+}(4450)$ in $J/\psi$ photoproduction on nuclei near threshold
• Perturbative Corrections to Heavy Quark-Diquark Symmetry Predictions for Doubly Heavy Baryon Hyperfine Splittings
• Interpretation of $Y(4390)$ as an isoscalar partner of $Z(4430)$ from $D^{\ast }(2010){\bar{D}}_1(2420)$ interaction
• Electric dipole transitions of $1P$ bottomonia
• Generalized Lüscher's Formula in Multichannel Baryon-Baryon Scattering
• Precise determination of the eta_c mass and width in the radiative J/Psi -> eta_c gamma decay
• Search for $X(3872)$ and $X(3915)$ decay into ${\chi }_{c1}{\pi }^0$ in $B$ decays at Belle
• 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
• Degeneracy of doubly heavy baryons from heavy quark symmetry
• Observation of $e^{+}{e}^{-}\to \eta h_c$ at center-of-mass energies from 4.085 to 4.600 GeV
• Search for charmonium and charmonium-like states in Υ(2S) radiative decays
• Search for B decays to final states with the eta_c meson
• 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 $4.60\mathrm{GeV}$
• QCD Compositeness as Revealed in Exclusive Vector Boson Reactions through Double-Photon Annihilation: $e^{+}{e}^{-}\to \gamma {\gamma }^{\ast }\to \gamma V^0$ and $e^{+}{e}^{-}\to {\gamma }^{\ast }{\gamma }^{\ast }\to V^0{V}^0$
• 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 $p\bar{p}$
• Search for charmonium and charmonium-like states in ${\rm Y}(1S)$ radiative decays
• $XYZ$ particles at Belle
• Poincaré invariance in NRQCD and pNRQCD revisited
• Radiative and $\rho$ transitions between heavy quarkonium and isovector four-quark states
• An Improved Limit for Gamma_ee of X(3872) and Gamma_ee Measurement of psi(3686)
• Mixing of meson, hybrid, and glueball states
• A search for weakly decaying b-flavored pentaquarks
• ${\rm Y}(6S)$ and triangle singularity in $e^{+}{e}^{-}\to B_1(5721)\bar{B}\to Z_b(10610)\pi$
• ${\chi }_{c1}$ and ${\chi }_{c2}$ production at $e^{+}{e}^{-}$ colliders
• Evidence for $Z_c^{\pm }$ decays into the ${\rho }^{\pm }{\eta }_c$ final state
• Observation of the ${\Lambda }_b^0\to {\chi }_{c1}(3872)p{K}^{-}$ decay
• Estimates of the $X(3872)$ Cross Section at a Hadron Collider
• Observation of the decay ${\Lambda }_b^0\to \psi (2S)p{\pi }^{-}$
• On the production of hidden-flavored hadronic states at high energy
• $0^{+}$ tetraquark states from improved QCD sum rules: delving into $X(5568)$
• Reconciling the Light Scalar Mesons with Breit-Wigner Resonances as well as the Quark Model
• The GlueX DIRC Project
• Comment on "Relation between scattering amplitude and Bethe-Salpeter wave function in quantum field theory"
• Chiral symmetry, the angular content of the vector current in QED and QCD, and the holographic description of hadrons
• Combination of CDF and D0 results on the mass of the top quark using up $9.7{\mathrm{fb}}^{-1}$ at the Tevatron
• A Lattice Study of $({\bar{D}}_1{D}^{\ast }{)}^{\pm }$ Near-threshold Scattering
• First observation of $B^{+}\to D_s^{+}{K}^{+}{K}^{-}$ decays and a search for $B^{+}\to D_s^{+}\varphi$ decays
• Observation of $e^{+}{e}^{-}\to \varphi {\chi }_{c1}$ and $\varphi {\chi }_{c2}$ at $\sqrt{s}$=4.600 GeV
• Splittings of low-lying charmonium masses at the physical point
• Dependence of five and six-loop estimated QCD corrections to the relation between pole and running masses of heavy quarks on the number of light flavours
• Coupled-Channel-Induced $S-D$ mixing of Charmonia and Testing Possible Assignments for $Y(4260)$ and $Y(4360)$
• Search for the $0^{--}$ Glueball in ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays
• Charged charmonium-like states as rescattering effects in B -> D_sJ D^(*) decays
• Are the XYZ states unconventional states or conventional states with unconventional properties?
• Remarks on meson loop effects on quark models
• The chromo-polarizabilities of a heavy quark at weak coupling
• Search for the isospin violating decay $Y(4260)\to J/\psi \eta {\pi }^0$
• Reply to "Comment on `Relation between scattering amplitude and Bethe-Salpeter wave function in quantum field theory"'
• Multichannel calculation of the very narrow $D_{s0}^{\ast }(2317)$ and the very broad $D_0^{\ast }(2300-2400)$
• Estimating decay rate of $X^{\pm }(5568)\to B_s{\pi }^{\pm }$ while assuming them to be molecular states
• Resonance $X(5568)$ as an exotic axial-vector state
• A comparison of analysis techniques for extracting resonance parameters from lattice Monte Carlo data
• Phenomenological view on baryon-baryon potentials from lattice QCD simulations
• Does the bottomonium counterpart of $X(3872)$ exist?
• Hybrid Mesons from the Lattice
• Scattering amplitude from Bethe-Salpeter wave function inside the interaction range
• Evidence for $e^{+}{e}^{-}\to \gamma {\eta }_c(1S)$ at center-of-mass energies between 4.01 and 4.60 GeV
• Examining coupled-channel effects in radiative charmonium transitions
• Higher-order condensate corrections to ${\rm Y}$ masses, leptonic decay rates and sum rules
• Static hybrid quarkonium potential with improved staggered quarks
• Precision measurements of ${\sigma }_B(e^{+}{e}^{-}\to K_S^0{K}^{\pm }{\pi }^{\mp })$ at center-of-mass energies between 3.8 and 4.6 GeV
• Is the Y(4260) just a coupled-channel signal?
• Heavy Hadron Spectroscopy
• S-wave heavy quarkonium spectrum with next-to-next-to-next-to-leading logarithmic accuracy
• Relativistic corrections to the static energy in terms of Wilson loops at weak coupling
• Search for the $B\to Y(4260)K,Y(4260)\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Chiral extrapolation of the sigma and rho mesons from dispersion relations and Chiral Perturbation Theory
• Search for $XYZ$ states in ${\rm Y}(1S)$ inclusive decays
• Two- and three-body structure of the Y(4660)
• The leptonic widths of high $\psi$-resonances in unitary coupled-channel model
• Nonperturbative scalar-meson resonances with open charm and beauty
• QCD string in excited heavy-light mesons and heavy-quark hybrids
• Heavy-Quark Hybrid Mass Splittings: Hyperfine and "Ultrafine"
• How can $X^{\pm }(5568)$ escape detection?
• Hindered magnetic dipole transitions between P-wave bottomonia and coupled-channel effects
• Spectator Effects in Heavy Quark Effective Theory at O(1/m_Q^3)
• An introduction to the quark model
• Strong decay patterns of the hidden-charm tetraquarks
• Narrow exotic hadrons in the heavy quark limit of QCD
• Studying the bound state of the $B\bar{K}$ system in the Bethe-Salpeter formalism
• Meson spectroscopy: too much excitement and too few excitations
• No serious meson spectroscopy without scattering
• Baryon-Meson Loop Effects on the Spectrum of Non Strange Baryons
• Quarkonia: a theoretical frame
• Heavy hybrids and tetraquarks in effective field theory
• Some insights into the newly observed $Z_c(4100)$ in $B^0\to {\eta }_c{K}^{+}{\pi }^{-}$ by LHCb
• $D$ wave charmonia
• Pentaquark photoproduction
• Non perturbative physics from NSPT: renormalons, the gluon condensate and all that