Delta --> N gamma in Large-Nc QCD

Abstract

The decay Delta^+ --> p gamma is studied in the 1/N_c expansion of QCD. The ratio of the helicity amplitudes is determined to be A_{3/2}/A_{1/2} = \sqrt{3} + O(1/N_c^2). Equivalently, the ratio E2/M1 of the multipole amplitudes is predicted to be order 1/N_c^2.

4 pages

Cited by in corpus (41)

• Electromagnetic excitation of the Delta(1232)-resonance
• Electroexcitation of nucleon resonances
• Negative Parity 70-plet Baryon Masses in the 1/Nc Expansion
• Excited Baryons in Large N_c QCD Revisited: The Resonance Picture Versus Single-Quark Excitations
• Baryon Charge Radii and Quadrupole Moments in the 1/N_c Expansion: The 3-Flavor Case
• Electromagnetic N->Delta transition and neutron form factors
• Light Cone Sum Rules for gamma* N -> Delta Transition Form Factors
• Nucleon and gamma N -> Delta lattice form factors in a constituent quark model
• Radiative Decays of Decuplet to Octet Baryons in Light Cone QCD
• Baryon Decuplet to Octet Electromagnetic Transitions in Quenched and Partially Quenched Chiral Perturbation Theory
• Excited Baryon Decay Widths in Large N_c QCD
• Large-$N_c$ relations for the electromagnetic N to Delta(1232) transition
• Complete Analysis of Baryon Magnetic Moments in 1/N_c
• Electromagnetic Transition Form Factors of Baryon Resonances
• Baryon Exotics in the Quark Model, the Skyrme Model and QCD
• Decays of Non-strange Negative Parity Baryons in the 1/Nc Expansion
• Model-independent effects of Delta excitation in nucleon polarizabilities
• Electromagnetic Nucleon-to-Delta Transition in Holographic QCD
• Baryon magnetic moments in large-N_c chiral perturbation theory
• Sum rules for baryon decuplet magnetic moments
• Electromagnetic nucleon-delta transition in the perturbative chiral quark model
• The role of five-quark components in gamma decay of the $\Delta (1232)$
• 1/N Expansion for Exotic Baryons
• Improved empirical parametrizations of the ${\gamma }^{\ast }N\to \Delta (1232)$ and ${\gamma }^{\ast }N\to N(1520)$ helicity amplitudes and the Siegert's theorem
• Parametrizations of the ${\gamma }^{\ast }N\to \Delta (1232)$ quadrupole form factors and Siegert's theorem
• Delta-to-N-gamma Coulomb Quadrupole Amplitude in PQCD
• Pion Photoproduction Amplitude Relations in the 1/N_c Expansion
• Negative parity pentaquarks in large Nc QCD and quark model
• Baryon resonances in large $N_c$ QCD
• New low-$Q^2$ measurements of the ${\gamma }^{\ast }N\to \Delta (1232)$ Coulomb quadrupole form factor, pion cloud parametrizations and Siegert's theorem
• Hyperon Radiative Decays in the 1/N_c Expansion
• Light-cone sum rules for the $N\gamma \Delta$ transitions for real photons
• Baryon Magnetic Moments in Alternate 1/N_c Expansions
• Dirac form factors and electric charge radii of baryons in the combined chiral and 1/N_c expansions
• Exploring Baryon Resonances with Transition Generalized Parton Distributions: Status and Perspectives
• Bosonic Operator Methods for the Quark Model
• Combined parametrization of the neutron electric form factor and the ${\gamma }^{\ast }N\to \Delta (1232)$ quadrupole form factors
• Positive parity pentaquark towers in large Nc QCD
• Pion Electroproduction Amplitude Relations in the 1/N_c Expansion
• Target normal single-spin asymmetry in inclusive electron-nucleon scattering in the 1/Nc expansion
• Baryon quadrupole moment in the 1/N(c) expansion of QCD