Diquarks and Exotic Spectroscopy

Abstract

We propose that the recently discovered Θbaryon is a bound state of four quarks and an antiquark, containing two highly correlated ud-pairs. If so, the Θbaryon has positive parity, and it lies in an near-ideally mixed SU(3)_{f} \mathbf{\bar{10}}_{f} oplus \mathbf{8}_{f}. The Roper resonance and the P_{11}(1710) fit naturally into this classification. We predict an isospin 3/2 multiplet of Ξ's (S=-2) with J^Π=\half^{+} around 1750 MeV. A search for manifestly exotic Ξ^{+} and Ξ^{--} in this mass range could provide a sharp test of our proposal. We predict that charm and bottom analogues of the Θbaryon are stable against strong decays.

5 pages, 2 figures, revtex 4, minor corrections and revisions for journal publication

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• Hamiltonian, Path Integral and BRST Formulations of Large N Scalar $QC{D}_2$ on the Light-Front and Spontaneous Symmetry Breaking
• Mixing of Pentaquark and Molecular States
• Prospects for Pentaquark Searches in $e^{+}{e}^{-}$ Annihilations and $\gamma \gamma$ Collisions
• Pentaquarks $uudd\bar{q}$ with One Color Sextet Diquark
• Search for Exotic S=-2 Baryons in proton-antiproton Collisions at sqrt(s) = 1.96 TeV
• The anti-decuplet candidate Xi--(1862) as a heptaquark with the overlap of two anti-kaons and a nucleon
• An interacting quark-diquark model. Strange and nonstrange baryon spectroscopy and other observables
• Exotic particle searches with STAR at RHIC
• Study of a possible S=+1 dynamically generated baryonic resonance
• Perturbative $O({\alpha }_s)$ corrections to the correlation functions of light tetraquark currents
• Search for a promising tetraquark candidate $X(ud\bar{s}\bar{s})$ in $pn\to \Lambda \Lambda X$
• Heavy baryons in the Skyrme model: the role of highly anharmonic collective motion
• Triply Heavy $\Omega$ Baryons with JETHAD: A High-Energy Viewpoint
• Diquarks in the nilpotency expansion of QCD and their role at finite chemical potential
• Model-independent methods to measure the $P$-parity of the ${\Theta }^{+}$-pentaquark in photoproduction experiments
• Exotic Baryons in Two-Dimensional QCD
• Stringent test of $CP$ symmetry in ${\Sigma }^{+}$ hyperon decays
• Experimental Outlook for the Pentaquark
• Can low-lying Roper states be explained as antidecuplet members?
• Moments of inertia, nucleon axial-vector coupling, the {\bf 8}, {\bf 10}, $\overline{10}$ and ${27}_{3/2}$ mass spectrums and the higher SU(3)_f representation mass splittings in the Skyrme model
• The effective radius for production of baryon-antibaryon pairs from $\psi$ decays
• Mass spectrum of the J^P=1/2^- and 3/2^- pentaquark antidecuplets in the perturbative chiral quark model
• The re-analysis of the 1700 MeV structure of the P11 partial wave using the piN->KLambda production data
• Spin-3/2 Pentaquark in QCD Sum Rules
• Production of the pentaquark ${\Theta }^{+}$ in $np$ scattering
• Influence of tensor interactions on masses and decay widths of dibaryons
• Summary of ICHEP 2004
• Baryon Spectrum in Large N(C) Chiral Soliton and in Quark Models
• Theta++ from QCD sum rule
• Pentaquarks in the Chiral Symmetry Limit
• Possible quantum numbers of the pentaquark Θ^+(1540) in QCD sum rules
• $Y(4626)$ as a $P$-wave $[cs][\bar{c}\bar{s}]$ tetraquark state
• Search for Pentaquarks in the Hadronic Decays of the Z Boson with the DELPHI Detector at LEP
• Proposal and theoretical formalism for studying baryon radiative decays from J/ψ\to B^*\bar B + \bar{B^*}B \to γB\bar B
• Chiral Symmetry and N*(1440) -> N pi pi Decay
• No Radial Excitations in Low Energy QCD. I. Diquarks and Classification of Mesons
• Stable Pentaquarks from Strange Chiral Multiplets
• Systematic study of pentaquark states: $qqq-q\bar{q}$ configuration
• A Selection Rule for Multiquark Decays
• Multi-quark components in baryons
• Diquarks, Pentaquarks and Dibaryons
• SU(3) constraints on cryptoexotic pentaquarks
• Kaon-Soliton Bound State Approach to the Pentaquark States
• Light Scalar Decay in Diquark Chiral Effective Theory
• Parity of Anti-Decuplet Baryons Revisited from Chiral Soliton Models
• Penta-quark in Anisotropic Lattice QCD
• Relativistic five-quark equations and u, d- pentaquark spectroscopy
• Theoretical Overview: The New Mesons
• Two Nucleon-States in a Chiral Quark-Diquark Model
• SU(6), Triquark states, and the pentaquark
• Diquark-diquark correlations in the ${}^1{S}_0$ $\Lambda \Lambda$ potential
• Possibility of determinig the parity of the pentaquark ${\Theta }^{+}$ from photoproduction near threshold
• Calculating loops without loop calculations: NLO computation of pentaquark correlators
• Upper limits for the photoproduction cross section for the Phi--(1860) pentaquark state off the deuteron
• Non-perturbative Analysis of Various Mass Generation by Gluonic Dressing Effect with the Schwinger-Dyson Formalism in QCD
• The ${\bar{D}}^{\ast }{\bar{D}}^{\ast }{\Sigma }_c$ Three-Body System
• The exotic baryon mass spectrum and the decuplet-octet and antidecuplet-octet mass difference in the Skyrme model
• Pentaquarks, Skyrmions and the Vector Manifestation of Chiral Symmetry
• Revisiting light-flavor diquarks in the inverse matrix method of QCD sum rules
• Mixing angles between the tetraquark states with two heavy quarks within QCD sum rules
• Positive parity pentaquark towers in large Nc QCD
• Diquark properties and their role in hadrons
• Faddeev calculation of pentaquark ${\Theta }^{+}$ in the Nambu-Jona-Lasinio model-based diquark picture
• The Observed Correlations for the Strange Multibaryon States in Systems with $\Lambda$-Hyperon from pa Collision at Momentum of 10 Gev/$c$
• Structure and reactions of pentaquark baryons
• Tetraquark and Pentaquark Systems in Lattice QCD
• Searching for diquarks in hadrons
• Relativistic five-quark equations and negative parity pentaquarks
• Measurement of ${\Sigma }^{+}$ transverse polarization in $e^{+}{e}^{-}$ collisions at $\sqrt{s}=3.68-3.71$ GeV
• Diquark in Nona-quark States
• The Possible $J^{PC}{I}^G=2^{++}{2}^{+}$ State X(1600)
• Two-body decay widths of lowest lying and next-to-lowest lying scalar and pseudoscalar mesons in generalized linear sigma model
• Pentaquark Masses in Chiral Perturbation Theory
• The Skyrme model predictions for the ${27}_{J=3/2}$ mass spectrum and the ${27}_{3/2}$-$\overline{10}$ mass splittings
• Selected problems of baryons spectroscopy: chiral soliton versus quark models
• Multi-quark states
• Re-examining valence quark spin distributions
• Some (further) Comments on the Theta(1540) Pentaquark
• Study on the Form Factors at Effective Vertices of Diqarks Interacting with Gauge Bosons
• Search for an exotic S=-2, Q=-2 baryon resonance in proton-proton interactions at $\sqrt{s_{NN}}$ = 17.3 GeV
• Structure and decay width of Θ^+ in a one-gluon exchange model
• Diquark Correlations from Nucleon Charge Radii
• Proposal of Direct Search for Strongly Bound States of ppbar, npbar Systems with High Intensity and Collective pbar beam
• The pentaquark ${\Theta }^{+}(1540)$ in the string model
• Photoproduction of Pentaquark ${\Theta }^{+}$ and Chiral Symmetry Restoration in Hot and Dense Medium
• The Quark Structure of Pentaquarks
• Multimodal Fragmentation of All-Heavy Pentaquarks: Uncertainty-Aware Predictions for Hadron Colliders
• Hadronic Physics and Exotics
• Pentaquarks in string dynamics
• Antikaon angular distributions in the reaction $\gamma d\to K^{-}{\Theta }^{+}p\to K^{-}{K}^{+}np$ near the threshold and the parity of the ${\Theta }^{+}$ pentaquark
• Strange meson-nucleon states in the quark potential model
• Quarkonia & Pentaquarks
• Baryon correlators containing different diquarks from lattice simulations
• Status of Pentaquark Search at Jlab
• Dynamics of Multiquark Systems: Mass, Width and Exotics
• Relativistic five-quark equations and exotic baryons with isospin I=5/2
• Beyond CP violation: hadronic physics at BaBar
• Diquark-Antidiquark Interpretation of Mesons
• Prediction of the masses and decay processes of strange, charmed and bottomed pentaquarks from the linear molecular crypto-heptaquark model
• Proton Sea Quark Flavour Asymmetry and Roper Resonance
• Looking for a vector charmonium-like state $Y$ in $e^{+}{e}^{-}\to \bar{D}{D}_1(2420)+c.c.$
• $P$-parity of charm and strange particles in electroproduction processes, in collinear regime
• Diquark correlations in baryons: the Interacting Quark Diquark Model
• Effect of Chiral Symmetry Restoration on Pentaquark ${\Theta }^{+}$ Mass and Width at Finite Temperature and Density
• Heavy Antiquark Pentaquarks in the CM and GB Models
• The study of doubly charmed pentaquark $cc\bar{q}qq$ with the SU(3) symmetry
• Stability of the rotating SU(3) Skyrmion
• Relativistic Calculation of the Width of the Theta (1540) Pentaquark
• P-wave Pentaquark and its Decay in the Quark Model with Instanton Induced Interaction
• $\Lambda (1405)$ and $\bar{\Lambda }(1405)$ in $J/\psi$ four-body decays
• Baryon number transfer could delay Quark-Hadron transition in cosmology
• Review of Recent Measurements of Meson and Hyperon Form Factors
• Decay Probability Ratio of Pentaquark Theta^+ State
• The double life of the X meson
• Observation of Transverse Polarization and Determination of Psionic Form Factors of the $\Lambda$ Hyperon at $\sqrt{s}=3.773$ GeV
• Can Chiral Symmetry Explain the Small Pentaquark Width?
• Insights into $Q^2{\bar{Q}}^2$ states from an effective perspective
• Irreducible tensor approach to spin observables in photo production of mesons with arbitrary spin-parity $s^{\pi }$
• Large-$N_c$ QCD and tetraquarks
• Width of Theta - pentaquarks in relativistic quark model
• Heavy-flavor multimodal fragmentation to $S$-wave pentacharms at next-generation hadron colliders
• Chiral Soliton Model vs Pentaquark Structure for Θ(1540)
• A Variational Study of the Nucleon Wavefunction
• Meson scattering and tetraquarks in two-dimensional QCD
• Spectroscopy of Pentaquark Baryons
• Time-like electromagnetic form factors of $\Lambda ,\Sigma$ and ${\Xi }^{+}$ in a light-front quark model
• Light Front Approach for Strong and Weak Decays of Pentaquarks
• Constituent quark models and pentaquark baryons
• Low-lying $s=+1$ Pentaquark states in the Inherent Nodal Structure Analysis
• Tetraquark Interpretation and Production Mechanism of the Belle $Y_b(10750)$-Resonance
• Tetraquark Properties at Large $N_{\mathrm{c}}$
• Strange and nonstrange baryon spectra in the interacting quark-diquark model
• Spin polarization of $\Lambda$ hyperons in $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$ at BESIII
• A non-abelian model $SU(N)\times SU(N)$
• The scalar and pseudoscalar hidden-charm tetraquark states with QCD sum rules
• Revisiting the pentaquark episode for lattice QCD
• Baryon resonances in the strangeness production
• Complete basis for the pentaquark wave function in a group theory approach
• Asymptotic directional structure of radiation for fields of algebraic type D
• Quark Model and multiquark system
• Skyrmions and pentaquarks in the quark-hadron continuity perspective
• Light hadron spectroscopy in quenched QCD with overlap fermions
• Heavy Pentaquarks in the Diquark Model and the Large N_c Expansion