Hadronic molecules and multiquark states

Abstract

In this text different theoretical approaches towards multi-quark states are introduced, namely hadrocharmonia, compact tetraquarks and hadronic molecules. The predictions derived from either of them are contrasted with current and possible future observations. The focus is on doubly heavy systems, but singly heavy and light systems are mentioned briefly as well.

arXiv comment23 pages, 10 figures., commissioned article for the Encyclopedia of Particle Physics

References in corpus (203)

• Modern Theory of Nuclear Forces
• Hadronic molecules
• Universality in Few-body Systems with Large Scattering Length
• Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda }_b^0\to J/\psi K^{-}p$ decays
• The $XYZ$ states: experimental and theoretical status and perspectives
• Multiquark Resonances
• Non-Standard Heavy Mesons and Baryons, an Experimental Review
• Diquark-Antidiquarks with Hidden or Open Charm and the Nature of X(3872)
• A New Expansion for Nucleon-Nucleon Interactions
• Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$
• Potential NRQCD: an effective theory for heavy quarkonium
• An updated review of the new hadron states
• From the Deuteron to Deusons, an Analysis of Deuteronlike Meson-Meson Bound States
• Chiral Multiplets of Heavy-Light Mesons
• Evidence that the a0(980) and f0(980) are not elementary particles
• Observation of structure in the $J/\psi$-pair mass spectrum
• Implications of a DK Molecule at 2.32 GeV
• On heavy-light meson resonances and chiral symmetry
• Dynamically Generated Open and Hidden Charm Meson Systems
• Discovery of doubly-charmed Xi_{cc} baryon implies a stable (b b ubar dbar) tetraquark
• Exotic Hadrons with Heavy Flavors -X, Y, Z and Related States-
• Observed D_s(2317) and tentative D(2100-2300) as the charmed cousins of the light scalar nonet
• Couplings in coupled channels versus wave functions: application to the X(3872) resonance
• Heavy-quark symmetry implies stable heavy tetraquark mesons $Q_i{Q}_j{\bar{q}}_k{\bar{q}}_l$
• Dynamically generated 0^+ heavy mesons in a heavy chiral unitary approach
• Threshold cusps and triangle singularities in hadronic reactions
• Decoding the riddle of Y(4260) and $Z_c(3900)$
• The Z(4430) and a New Paradigm for Spin Interactions in Tetraquarks
• How to reveal the exotic nature of the P_c(4450)
• Charmonium Options for the X(3872)
• Hadro-Charmonium
• Multiquark States
• Emergence of a complete heavy-quark spin symmetry multiplet: seven molecular pentaquarks in light of the latest LHCb analysis
• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• Understanding the newly observed heavy pentaquark candidates
• Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarks
• Combining heavy quark spin and local hidden gauge symmetries in the dynamical generation of hidden charm baryons
• Lattice Prediction for Deeply Bound Doubly Heavy Tetraquarks
• Pion Interactions in the X(3872)
• Observation of $e^{+}{e}^{-}\to \gamma X(3872)$ at BESIII
• Are Y(4260) and {\rm Z${}_2^{+}$(4250)} ${\mathrm{D}}_1\mathrm{D}$ or ${\mathrm{D}}_0{\mathrm{D}}^{\ast }$ Hadronic Molecules?
• Study of doubly heavy tetraquarks in Lattice QCD
• Diagnostic Decays of the X(3872)
• X(3872): Hadronic Molecules in Effective Field Theory
• Dynamically generated 1^+ heavy mesons
• Study of $P_c(4457)$, $P_c(4440)$, and $P_c(4312)$ in a quasipotential Bethe-Salpeter equation approach
• Heavy quark spin symmetric molecular states from ${\bar{D}}^{(\ast )}{\Sigma }_c^{(\ast )}$ and other coupled channels in the light of the recent LHCb pentaquarks
• $QQ\bar{Q}\bar{Q}$ states: masses, production, and decays
• Reconciling the X(3872) with the near-threshold enhancement in the D^0\bar{D}^{*0} final state
• A New Picture for the Formation and Decay of the Exotic $XYZ$ Mesons
• Understanding $D_{sJ}(2317)$
• QCD sum rules study of $QQ-\bar{u}\bar{d}$ mesons
• Testing the Nature of the D_{sJ}^*(2317)^+ and D_{sJ}(2463)^+ States Using Radiative Transitions
• A Discussion on Triangle Singularities in the ${\Lambda }_b\to J/\psi K^{-}p$ Reaction
• Interpretation of the LHCb $P_c$ States as Hadronic Molecules and Hints of a Narrow $P_c(4380)$
• Interactions between heavy mesons and Goldstone bosons from chiral dynamics
• Quark mass dependence of the rho and sigma from dispersion relations and Chiral Perturbation Theory
• Possible interpretations of the $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$
• Exploring the molecular scenario of $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$
• Diquark Correlations in Hadron Physics: Origin, Impact and Evidence
• Heavy-flavored tetraquark states with the $QQ\bar{Q}\bar{Q}$ configuration
• Estimate for the X(3872) to gamma J/psi decay width
• Coupled-channel approach to $T_{cc}^{+}$ including three-body effects
• Coupled-channel analysis of the possible $D^{(\ast )}{D}^{(\ast )}$, ${\bar{B}}^{(\ast )}{\bar{B}}^{(\ast )}$ and $D^{(\ast )}{\bar{B}}^{(\ast )}$ molecular states
• Radiative transitions from Upsilon(5S) to molecular bottomonium
• Spectrum of fully-heavy tetraquarks from a diquark+antidiquark perspective
• Wave functions of composite hadron states and relationship to couplings of scattering amplitudes for general partial waves
• Anatomy of the newly observed hidden-charm pentaquark states: $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$
• A Comprehensive Four-Quark Interpretation of D_s(2317), D_s(2457) and D_s(2632)
• Line Shapes of the X(3872)
• Comment on the new $D_s^{(\ast )+}{\pi }^0$ resonances
• Study of the lineshape of the ${\chi }_{c1}(3872)$ state
• Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum
• Tetra- and penta-quark structures in the constituent quark model
• Production of the X(3872) in charmonia radiative decays
• Isospin breaking decays as a diagnosis of the hadronic molecular structure of the $P_c(4457)$
• Two-pole structure of the $D_0^{\ast }(2400)$
• All-heavy tetraquarks
• Analysis of the $QQ\bar{Q}\bar{Q}$ tetraquark states with QCD sum rules
• BB interactions with static bottom quarks from Lattice QCD
• Could the near-threshold $XYZ$ states be simply kinematic effects?
• Comprehensive analysis of the wave function of a hadronic resonance and its compositeness
• Signature of a doubly charm tetraquark pole in $D{D}^{\ast }$ scattering on the lattice
• Heavy Quark Symmetry Predictions for Weakly Bound B-Meson Molecules
• Description of the $D_s^{\ast }(2320)$ resonance as the $D\pi$ atom
• The hidden charm pentaquark states and ${\Sigma }_c{\bar{D}}^{(\ast )}$ interaction in chiral perturbation theory
• Interpretation of the Narrow $J/\psi p$ Peaks in ${\Lambda }_b\to J/\psi p{K}^{-}$ Decay in the Compact Diquark Model
• Probabilistic interpretation of compositeness relation for resonances
• 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
• Evidence that the Y(4660) is a f_0(980)psi' bound state
• A Theory of X and Z Multiquark Resonances
• Power Counting and Perturbative One Pion Exchange in Heavy Meson Molecules
• New structures in the J/$\psi$J/$\psi$ mass spectrum in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Prediction of hidden charm strange molecular baryon states with heavy quark spin symmetry
• Analysis of the $P_c(4312)$, $P_c(4440)$, $P_c(4457)$ and related hidden-charm pentaquark states with QCD sum rules
• Observation of an excess of di-charmonium events in the four-muon final state with the ATLAS detector
• $Y(4260)$ as the first $S$-wave open charm vector molecular state?
• Strong decays of the latest LHCb pentaquark candidates in hadronic molecule pictures
• Interplay of quark and meson degrees of freedom in a near-threshold resonance: multi-channel case
• J/psi gamma and psi(2S) gamma decay modes of the X(3872)
• Molecular Interpretation of the $P_c(4440)$ and $P_c(4457)$ States
• Implications of heavy quark spin symmetry on heavy meson hadronic molecules
• $P_c(4457{)}^{+}$, $P_c(4440{)}^{+}$, and $P_c(4312{)}^{+}$: molecules or compact pentaquarks?
• Interpretation of the LHCb Pc(4312) Signal
• Hidden-charm and hidden-bottom molecular pentaquarks in chiral perturbation theory
• Inclusive Decays of Heavy Quarkonium to Light Particles
• Coupled-channel interpretation of the LHCb double-$J/\psi$ spectrum and hints of a new state near the $J/\psi J/\psi$ threshold
• Two-pole structures in QCD: Facts, not fantasy!
• Revisiting the nature of the $P_c$ pentaquarks
• Evidence of a resonant structure in the $e^{+}{e}^{-}\to {\pi }^{+}{D}^0{D}^{\ast -}$ cross section between 4.05 and 4.60 GeV
• Including heavy spin effects in the prediction of a $\bar{b}\bar{b}ud$ tetraquark with lattice QCD potentials
• Three-body $D\bar{D}\pi$ dynamics for the X(3872)
• On the nature of near-threshold bound and virtual states
• Different pole structures in line shapes of the $X(3872)$
• Towards a new paradigm for heavy-light meson spectroscopy
• What can radiative decays of the X(3872) teach us about its nature?
• Employing spin symmetry to disentangle different models for the XYZ states
• Y(4260) and Y(4360) as mixed hadrocharmonium
• Interplay of quark and meson degrees of freedom in a near-threshold resonance
• Analyzing doubly heavy tetra- and penta-quark states by variational method
• Heavy-quark spin symmetry partners of the $X(3872)$ revisited
• Narrow Nucleon-$\psi (2S)$ Bound State and LHCb Pentaquarks
• $P_c$ pentaquarks with chiral tensor and quark dynamics
• Y(4260): hadronic molecule versus hadro-charmonium interpretation
• Remarks on pole trajectories for resonances
• A Canonical Ds(2317)?
• Tetraquark bound states in the heavy-light heavy-light system
• New LHCb pentaquarks as hadrocharmonium states
• A New Look at the $Y$ Tetraquarks and ${\Omega }_c$ Baryons in the Diquark Model
• Interplay of quark and meson degrees of freedom in near-threshold states: A practical parametrisation for line shapes
• One pion exchange and the quantum numbers of the Pc(4440) and Pc(4457) pentaquarks
• Lineshapes for composite particles with unstable constituents
• Decays of $P_c$ into $J/\psi N$ and ${\eta }_{c}N$ with heavy quark spin symmetry
• Decay widths of the spin-2 partners of the X(3872)
• Quarkonium Contribution to Meson Molecules
• Doubly Charmed Tetraquarks in B_c and Xi_bc Decays
• The line shapes of the $Z_b(10610)$ and $Z_b(10650)$ in the elastic and inelastic channels revisited
• Effective range expansion for narrow near-threshold resonances
• Analysis of the axialvector doubly heavy tetraquark states with QCD sum rules
• Some decay properties of hidden-charm pentaquarks as baryon-meson molecules
• More kaonic bound states and a comprehensive interpretation of the D_{sJ} states
• Probing hidden-charm decay properties of $P_c$ states in a molecular scenario
• The Dynamical Diquark Model: First Numerical Results
• The baryo-quarkonium picture for hidden-charm and bottom pentaquarks and LHCb $P_{\mathrm{c}}(4380)$ and $P_{\mathrm{c}}(4450)$ states
• Structure and decays of hidden heavy pentaquarks
• Is the existence of a $J/\psi J/\psi$ bound state plausible?
• Probing new types of $P_c$ states inspired by the interaction between an $S$-wave charmed baryon and an anticharmed meson in a $\bar{T}$ doublet state
• Nucleon Resonances with Hidden Charm in $\gamma p$ reactions
• Quark mass dependence of the X(3872) binding energy
• Possible Molecular States of $D^{(\ast )}{D}^{(\ast )}$ and $B^{(\ast )}{B}^{(\ast )}$ within the Bethe-Salpeter framework
• From the lineshape of the $X(3872)$ to its structure
• Analysis of the strong decays of the $P_c(4312)$ as a pentaquark molecular state with QCD sum rules
• Heavy-Quark Symmetry Partners of the Pc(4450) Pentaquark
• The Doubly-heavy Tetraquarks ($q{q}^{\prime }\bar{Q}\overline{Q^{\prime }}$) in a Constituent Quark Model with a Complete Set of Harmonic Oscillator Bases
• Even- and Odd-Parity Charmed Meson Masses in Heavy Hadron Chiral Perturbation Theory
• Construction of $bb\bar{u}\bar{d}$ tetraquark states on lattice with NRQCD bottom and HISQ up/down quarks
• How much is the compositeness of a bound state constrained by $a$ and $r_0$? The role of the interaction range
• Hunting for states in the recent LHCb di-$J/\psi$ invariant mass spectrum
• New results from a number operator interpretation of the compositeness of bound and resonant states
• Compositeness of S-wave weakly-bound states from next-to-leading order Weinberg's relations
• Solving the left-hand cut problem in lattice QCD: $T_{cc}(3875{)}^{+}$ from finite volume energy levels
• Recently observed $P_c$ as molecular states and possible mixture of $P_c(4457)$
• Towards the quark mass dependence of $T_{cc}^{+}$ from lattice QCD
• How to reveal the nature of three or more pentaquark states?
• Comment on "Possibility of Deeply Bound Hadronic Molecules from Single Pion Exchange"
• Generalized weak-binding relations of compositeness in effective field theory
• Exotic Tetraquark states with two $\bar{b}$-quarks and $J^P=0^{+}$ and $1^{+}$ $B_s$ states in a nonperturbatively-tuned Lattice NRQCD setup
• Spin partners $W_{bJ}$ from the line shapes of the $Z_b(10610)$ and $Z_b(10650)$
• Pole analysis on the hadron spectroscopy of ${\Lambda }_b\to J/\Psi p{K}^{-}$
• Generalization of Weinberg's Compositeness Relations
• Heavy-hadron molecules from light-meson-exchange saturation
• One Born$-$Oppenheimer Effective Theory to rule them all: hybrids, tetraquarks, pentaquarks, doubly heavy baryons and quarkonium
• Two-body wave functions and compositeness from scattering amplitudes. I. General properties with schematic models
• Search for $\bar{b}\bar{b}us$ and $\bar{b}\bar{c}ud$ tetraquark bound states using lattice QCD
• Light quark mass dependence of the X(3872) in XEFT
• Where is the lightest charmed scalar meson?
• $X(3872)$ as a four-quark state in a Dyson-Schwinger/Bethe-Salpeter approach
• Strong decays of $T_{cc}^{+}$ at NLO in an effective field theory
• Heavy quark spin multiplet structure of $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$
• Prediction of a narrow exotic hadronic state with quantum numbers $J^{PC}=0^{--}$
• Spectrum of the $uudc\bar{c}$ hidden charm pentaquark with an SU(4) flavor-spin hyperfine interaction
• Binding energy of the $X(3872)$ at unphysical pion masses
• The Dynamical Diquark Model: Fine Structure and Isospin
• Heavy-hadron molecular spectrum from light-meson exchange saturation
• $X(4260)$ Revisited: A Coupled Channel Perspective
• Peaks within peaks and the possible two-peak structure of the Pc(4457): the effective field theory perspective
• Doubly heavy tetraquark states in the constituent quark model using diffusion Monte Carlo method
• Study of the resonance structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ process
• Revisiting $X(3872)\to D^0{\bar{D}}^0{\pi }^0$ in XEFT
• Threshold Effects and the Line Shape of the X(3872) in Effective Field Theory
• Predicting isovector charmonium-like states from X(3872) properties
• $Z_c(4100)$ and $Z_c(4200)$ as hadrocharmonium
• Remarks on the Heavy-Quark Flavour Symmetry for doubly heavy hadronic molecules
• $X(3872)$ as virtual companion pole of the charm-anticharm state ${\chi }_{c1}(2P)$
• Hidden-flavour four-quark states in the charm and bottom region
• Interpretation of $Y(4390)$ as an isoscalar partner of $Z(4430)$ from $D^{\ast }(2010){\bar{D}}_1(2420)$ interaction
• $DK/D\pi$ scattering and an exotic virtual bound state at the $SU(3)$ flavour symmetric point from lattice QCD
• On chiral excitations with exotic quantum numbers
• Remarks on meson loop effects on quark models
• Do near-threshold molecular states mix with neighbouring $\bar{Q}Q$ states?
• Spatial interpretation of "compositeness" for finite-range potentials
• Compositeness of near-threshold $s$-wave resonances