A Theory of X and Z Multiquark Resonances

Abstract

We introduce the hypothesis that diquarks and antidiquarks in tetraquarks are separated by a potential barrier. We show that this notion can answer satisfactorily long standing questions challenging the diquark-antidiquark model of exotic resonances. The tetraquark description of X and Z resonances is shown to be compatible with present limits on the non-observation of charged partners X^+-, of the X(3872) and the absence of a hyperfine splitting between two different neutral states. In the same picture, Z_c and Z_b particles are expected to form complete isospin triplets plus singlets. It is also explained why the decay rate into final states including quarkonia are suppressed with respect to those having open charm/beauty states.

6 pages, 2 figures, some points clarified. To appear in PLB

References in corpus (9)

• Multiquark Resonances
• Exotics: Heavy Pentaquarks and Tetraquarks
• The Z(4430) and a New Paradigm for Spin Interactions in Tetraquarks
• Is the X(3872) Production Cross Section at Tevatron Compatible with a Hadron Molecule Interpretation?
• $QQ\bar{Q}\bar{Q}$ states: masses, production, and decays
• Indications of a Four-Quark Structure for the X(3872) and X(3876) Particles from Recent Belle and BABAR Data
• Production of Tetraquarks at the LHC
• Interpretation of Axial Resonances in J/psi-phi at LHCb
• Isospin splittings in baryons with two heavy quarks

Cited by in corpus (49)

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• Interpretation of the Narrow $J/\psi p$ Peaks in ${\Lambda }_b\to J/\psi p{K}^{-}$ Decay in the Compact Diquark Model
• Analysis of the doubly-charmed tetraquark molecular states with the QCD sum rules
• Hadronic molecules in B decays
• The nature of $X(3872)$ from high-multiplicity $pp$ collisions
• Nonrelativistic model of tetraquarks and predictions for their masses from fits to charmed and bottom meson data
• The Hydrogen Bond of QCD in Doubly Heavy Baryons and Tetraquarks
• Spin partners $W_{bJ}$ from the line shapes of the $Z_b(10610)$ and $Z_b(10650)$
• Hidden charm pentaquark states in a diquark model
• Tetraquarks in large-$N_c$ QCD
• The Hydrogen Bond of QCD
• Analysis of the vector tetraquark states with P-waves between the diquarks and antidiquarks via the QCD sum rules
• Study of $B_s^0\to J/\psi {\pi }^{+}{\pi }^{-}{K}^{+}{K}^{-}$ decays
• Excited and exotic bottomonium spectroscopy from lattice QCD
• Hidden-charm pentaquark states through the current algebra: From their productions to decays
• Observation of sizeable $\omega$ contribution to ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}J/\psi$ decays
• Decay behaviors of the fully-bottom and fully-charm tetraquark states
• Settling the $Z_c(4600)$ in the charged charmonium-like family
• Insights into $Z_b(10610)$ and $Z_b(10650)$ from dipion transitions from ${\rm Y}(10860)$
• Fully charmed tetraquarks from LHC to FCC: Natural stability from fragmentation
• Assignments of the $X(4140)$, $X(4500)$, $X(4630)$ and $X(4685)$ based on the QCD sum rules
• The X(3872) tetraquarks in B and B_s decays
• The role of the pion in the lineshape of the $X(3872)$
• $d^{\ast }(2380)$ and its partners in a diquark model
• Weak Decays of Stable Open-bottom Tetraquark by SU(3) Symmetry Analysis
• Bottomoniumlike states in proton collisions: Fragmentation and resummation
• Exotic tetraquarks at the HL-LHC with JETHAD: A high-energy viewpoint
• Fragmentation functions for axial-vector heavy tetraquarks: A TQ4Q1.1 update
• The $Z_b$ structures in a constituent quark model coupled-channels calculation
• Forming Molecular States with Hadronic Rescattering
• Fragmentation of fully heavy tetraquarks: The TQ4Q1.1 functions as a case study
• Study of charmonium and charmonium-like contributions in $B^{+}\to J/\psi \eta K^{+}$ decays
• Dispersive analysis of the isospin breaking in the $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}$ and $X(3872)\to J/\psi {\pi }^{+}{\pi }^0{\pi }^{-}$ decays
• Substructure of Multiquark Hadrons (Snowmass 2021 White Paper)
• Tetraquark-Jet Systems at the High-Luminosity LHC
• A short review on the compositeness of the $X(3872)$
• Probing the structure of $X(3872)$ in photoproduction
• Predictions for Bottomonium from a Relativistic Screened Potential Model
• The $\pi \pi$ scattering amplitude at large $N_{\text{c}}$
• Production of the bottomonium-like states $Z_b$ states at $e$-$h$ and ultraperipheral $h$-$h$ collisions
• Observation of the $B_s^0\to {\chi }_{c1}(3872){\pi }^{+}{\pi }^{-}$ decay
• Multimodal Fragmentation of All-Heavy Pentaquarks: Uncertainty-Aware Predictions for Hadron Colliders
• Hadronic molecules and multiquark states
• Insights into the exotic charged states $Z_b(10610)$ and $Z_b(10650)$ from their photoproduction off nuclei
• Heavy-flavor multimodal fragmentation to $S$-wave pentacharms at next-generation hadron colliders
• Tetraquark Properties at Large $N_{\mathrm{c}}$
• Unified study of $B_s^0\to X(3872){\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$ and $B_s^0\to \psi (2S){\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$ processes