Diquarks and Exotic Spectroscopy

2003/07/31 by R. L. Jaffe, Frank Wilczek, F. Wilczek · 29 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevlett.91.232003

published as Phys.Rev.Lett. 91 (2003) 232003 · 5 pages, 2 figures, revtex 4, minor corrections and revisions for journal publication

arxiv created 2003/10/29 · openalex publication_date 2003/12/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We propose that the recently discovered \ensuremathΘ⁺ baryon is a bound state of four quarks and an antiquark, containing two highly correlated ud pairs. If so, the \ensuremathΘ⁺ has positive parity, and it lies in an near-ideally mixed SU(3)_f 10_f\ensuremath\bigoplus8_f. The Roper resonance and the P₁₁(1710) fit naturally into this classification. We predict an isospin 3/2 multiplet of \ensuremathΞ's (S=\ensuremath-2) with J^\ensuremathΠ=(1)/(2)⁺ around 1750 MeV. A search for manifestly exotic \ensuremathΞ⁺ and \ensuremathΞ^-- in this mass range could provide a sharp test of our proposal. We predict that charm and bottom analogs of the \ensuremathΘ⁺ may be stable against strong decays.

Cited by

• Lattice study of light scalar tetraquarks
• A QCD sum rule study of the light scalar mesons
• Photoproduction of pentaquarkΘ+and chiral symmetry restoration in a hot and dense medium
• Are the pentaquark sum rules reliable?
• ExoticΘ+baryon production induced by a photon and a pion
• Pentaquark as a kaon-nucleon resonance
• The s–s¯ asymmetry in the nucleon and “NuTeV anomaly”
• Reanalysis of the mass spectrum of the scalar hidden charm and hidden bottom tetraquark states
• Exotic baryons in two-dimensional QCD
• Is Θ+(1540) a kaon–skyrmion resonance?
• Dynamical study ofQQ–u¯d¯mesons
• Diquarks in nonaquark states
• Search for Θ+ via π−p→K−X reaction near production threshold
• Pentaquark inK+‐dtotal cross section data
• Multiquark states
• The N*(1710) as a resonance in the ππN system
• Theoretical overview: the new mesons
• Analysis of the Y(4140) and related molecular states with QCD sum rules
• Diquark correlations in baryons on the lattice with overlap quarks
• Pentaquark decay width in QCD sum rules
• Spin 3/2 pentaquarks
• Search for higher flavor multiplets in partial-wave analyses
• A note on large N scalar QCD2
• Pentaquarks: Review on models and solitonic calculations of antidecuplet magnetic moments
• More loosely bound hadron molecules at CDF?
• D_sJ⁺(2317)\→ D_s⁺\π⁰ decay width
• P-wave pentaquark and its decay in the quark model with instanton induced interaction
• Magnetic moment of the pentaquark Θ+(1540) with QCD sum rules
• Color superconductivity in dense quark matter