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.

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

References in corpus (55)

• Multiquark Resonances
• Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$
• Dynamically Generated Open and Hidden Charm Meson Systems
• Discovery of doubly-charmed Xi_{cc} baryon implies a stable (b b ubar dbar) tetraquark
• 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
• The Z(4430) and a New Paradigm for Spin Interactions in Tetraquarks
• Hadro-Charmonium
• Emergence of a complete heavy-quark spin symmetry multiplet: seven molecular pentaquarks in light of the latest LHCb analysis
• Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarks
• Pion Interactions in the X(3872)
• Are Y(4260) and {\rm Z${}_2^{+}$(4250)} ${\mathrm{D}}_1\mathrm{D}$ or ${\mathrm{D}}_0{\mathrm{D}}^{\ast }$ Hadronic Molecules?
• 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
• QCD sum rules study of $QQ-\bar{u}\bar{d}$ mesons
• 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 $P_c(4380)$
• Quark mass dependence of the rho and sigma from dispersion relations and Chiral Perturbation Theory
• Estimate for the X(3872) to gamma J/psi decay width
• Anatomy of the newly observed hidden-charm pentaquark states: $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$
• Line Shapes of the X(3872)
• Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum
• Isospin breaking decays as a diagnosis of the hadronic molecular structure of the $P_c(4457)$
• Could the near-threshold $XYZ$ states be simply kinematic effects?
• Comprehensive analysis of the wave function of a hadronic resonance and its compositeness
• Interpretation of the Narrow $J/\psi p$ Peaks in ${\Lambda }_b\to J/\psi p{K}^{-}$ Decay in the Compact Diquark Model
• Exotic $QQ\bar{q}\bar{q}$, $QQ\bar{q}\bar{s}$ and $QQ\bar{s}\bar{s}$ states
• Evidence that the Y(4660) is a f_0(980)psi' bound state
• A Theory of X and Z Multiquark Resonances
• Implications of heavy quark spin symmetry on heavy meson hadronic molecules
• Hidden-charm and hidden-bottom molecular pentaquarks in chiral perturbation theory
• Two-pole structures in QCD: Facts, not fantasy!
• Including heavy spin effects in the prediction of a $\bar{b}\bar{b}ud$ tetraquark with lattice QCD potentials
• What can radiative decays of the X(3872) teach us about its nature?
• Interplay of quark and meson degrees of freedom in a near-threshold resonance
• Employing spin symmetry to disentangle different models for the XYZ states
• Remarks on pole trajectories for resonances
• A Canonical Ds(2317)?
• More kaonic bound states and a comprehensive interpretation of the D_{sJ} states
• The Dynamical Diquark Model: First Numerical Results
• Is the existence of a $J/\psi J/\psi$ bound state plausible?
• Structure and decays of hidden heavy pentaquarks
• Heavy-Quark Symmetry Partners of the Pc(4450) Pentaquark
• How to reveal the nature of three or more pentaquark states?
• Generalized weak-binding relations of compositeness in effective field theory
• Spin partners $W_{bJ}$ from the line shapes of the $Z_b(10610)$ and $Z_b(10650)$
• Two-body wave functions and compositeness from scattering amplitudes. I. General properties with schematic models
• Heavy quark spin multiplet structure of $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$
• 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