What is the role of the meson cloud in the ${\Sigma }^{\ast 0}\to \gamma \Lambda$ and ${\Sigma }^{\ast }\to \gamma \Sigma$ decays?

Abstract

We study the effect of the meson cloud dressing in the octet baryon to decuplet baryon electromagnetic transitions. Combining the valence quark contributions from the covariant spectator quark model with those of the meson cloud estimated based on the flavor SU(3) cloudy bag model, we calculate the transition magnetic form factors at $Q^2=0$ ($Q^2=-q^2$ and $q$ the four-momentum transfer), and also the decuplet baryon electromagnetic decay widths. The result for the ${\gamma }^{\ast }\Lambda \to {\Sigma }^{\ast 0}$ decay width is in complete agreement with the data, while that for the ${\gamma }^{\ast }{\Sigma }^{+}\to {\Sigma }^{\ast +}$ is underestimated the data by 1.4 standard deviations. This achievement may be regarded as a significant advance in the present theoretical situation.

Published in Phys.Rev.D. 14 pages, 1 figure, 6 tables. Minor corrections

References in corpus (15)

• Electromagnetic excitation of the Delta(1232)-resonance
• Chiral Perturbation Theory and Baryon Properties
• Spin 1/2^+, spin 3/2^+ and transition magnetic moments of low lying and charmed baryons
• A pure S-wave covariant model for the nucleon
• Extraction and Interpretation of gamma N --> Delta Form Factors within a Dynamical Model
• D-state effects in the electromagnetic N-Delta transition
• A relativistic quark model for the Omega- electromagnetic form factors
• A Covariant model for the nucleon and the $\Delta$
• Octet baryon electromagnetic form factors in nuclear medium
• The physical meaning of scattering matrix singularities in coupled-channel formalisms
• Covariant spectator quark model description of the ${\gamma }^{\ast }\Lambda \to {\Sigma }^0$ transition
• Electromagnetic Decay of the ${\Sigma }^0(1385)$ to $\Lambda \gamma$
• Radiative Decays of Decuplet Baryons, $\Lambda (1405)$ and $\Lambda (1520)$ Hyperons
• Baryon Magnetic Moments in Alternate 1/N_c Expansions
• N to $\Delta$ transition amplitudes from QCD sum rules

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• ${\gamma }^{\ast }N\to N^{\ast }(1520)$ form factors in the timelike regime
• Using the Single Quark Transition Model to predict nucleon resonance amplitudes
• Semirelativistic approximation to the ${\gamma }^{\ast }N\to N(1520)$ and ${\gamma }^{\ast }N\to N(1535)$ transition form factors
• Valence quark contributions for the ${\gamma }^{\ast }N\to N(1440)$ form factors from Light-Front holography
• ${\gamma }^{\ast }N\to N(1710)$ transition at high momentum transfer
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• $N^{\ast }$ Form Factors based on a Covariant Quark Model
• Electromagnetic form factors of the ${\Omega }^{-}$ baryon in the spacelike and timelike regions
• Covariant model for the Dalitz decay of the $N(1535)$ resonance
• Transition magnetic moments of $J^P={\frac{3}{2}}^{+}$ decuplet to $J^P={\frac{1}{2}}^{+}$ octet baryons in the chiral constituent quark model
• A covariant model for the decuplet to octet Dalitz decays
• Electromagnetic $|G_E/G_M|$ ratios of hyperons at large timelike $q^2$
• Combined parametrization of the neutron electric form factor and the ${\gamma }^{\ast }N\to \Delta (1232)$ quadrupole form factors
• Weak interaction axial form factors of the octet baryons in nuclear medium
• Meson cloud contributions to the Dalitz decays of decuplet to octet baryons
• Electroweak form factors of baryons in dense nuclear matter
• Quark model calculations of transition form factors at high photon virtualities
• A covariant model for the ${\gamma }^{\ast }N\to N^{\ast }(1520)$ reaction
• Octet baryon electroweak form factors in dense nuclear matter
• A Relativistic Model for the Electromagnetic Structure of Baryons from the 3rd Resonance Region
• A covariant model for the negative parity resonances of the nucleon
• Electric and magnetic timelike form factors of hyperons at large transfer momentum