The role of five-quark components in gamma decay of the image Original Research Article

An admixture of 10–20% of View the MathML source components in the Δ(1232) resonance is shown to reduce the well known underprediction by the qqq quark model of the decay width for Δ(1232)→Nγ decay by about half and that of the corresponding helicity amplitudes from a factor ∼1.7 to ∼1.5. The main effect is due to the quark–antiquark annihilation transitions: View the MathML source, the consideration of which brings the ratio A3/2/A1/2 and consequently the E2/M1 ratio REM into agreement with the empirical value. Transitions between the View the MathML source components in the resonance and the nucleon: View the MathML source, are shown to enhance the calculated decay width by only a few percent, as long as the probability of the View the MathML source component of the proton and the Δ(1232) is at most 20%. The transitions View the MathML source between the View the MathML source components in the Δ(1232) and the proton do not lead to a nonzero value for REM.