A Diquark Chiral Effective Theory and Exotic Baryons

Abstract

A chiral effective theory of quarks and diquarks is formulated and applied to exotic tetraquarks and pentaquarks. The effective theory is similar to the chiral quark effective theory with the addition of diquark degrees of freedom and couplings to quarks. Chiral symmetry through generalized Goldberger-Treiman relations, fixes the mass splitting between the even and odd parity diquarks to be about 600 MeV. We provide an estimate of the parameters of the effective theory from both the random instanton model and known data on the low lying scalar nonet. We assess the static properties of the exotic baryons, such as their masses, magnetic moments and decay widths. We show that the small decay widths of the newly reported exotics are largely due to a large tunnelling suppression of a quark between a pair of diquarks. We find $\Gamma ({\Theta }^{+}\to K^{+}n)\simeq 2.5\sim 7.0MeV$ and $\Gamma ({\Xi }^{--}\to {\Xi }^{-}{\pi }^{-})\simeq 1.7\sim 4.8MeV$.

17 pages, 5 figures. Refined the analysis on decay width. Added two footnotes and a note on H1 experiment

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Cited by in corpus (21)

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• Chiral effective theory of diquarks and the U_A(1) anomaly
• Spectrum of singly heavy baryons from a chiral effective theory of diquarks
• Heavy baryon spectrum with chiral multiplets of scalar and vector diquarks
• Pentaquarks: Review on Models and Solitonic Calculations of Antidecuplet Magnetic Moments
• Novel pentaquark picture for singly heavy baryons from chiral symmetry
• Light-Front Approach for Pentaquark Strong Decays
• Quark spin content of the proton, hyperon semileptonic decays, and the decay width of the ${\Theta }^{+}$ pentaquark
• Magnetic moment of the pentaquark ${\Theta }^{+}(1540)$ as diquark-diquark-antiquark state with QCD sum rules
• Magnetic moment of the pentaquark ${\Theta }^{+}(1540)$ with QCD sum rules
• Magnetic moment of the pentaquark ${\Theta }^{+}(1540)$ with light-cone QCD sum rules
• Strong decays of singly heavy baryons from a chiral effective theory of diquarks
• Light Scalar Decay in Diquark Chiral Effective Theory
• Non-perturbative Analysis of Various Mass Generation by Gluonic Dressing Effect with the Schwinger-Dyson Formalism in QCD
• Pentaquark Masses in Chiral Perturbation Theory
• Photoproduction of Pentaquark ${\Theta }^{+}$ and Chiral Symmetry Restoration in Hot and Dense Medium
• Chiral effective theory of scalar and vector diquarks revisited
• Light scalars as tetraquarks: decays and mixing with quarkonia
• Theta pentaquark In Multiquark Theories