2003/04/30 by K. Pumsa-ard, Kem Pumsa-ard, Valery E. Lyubovitskij +4 · 23 citations
Physics and Astronomy · #Amplitude #Boson #Goldstone #Goldstone boson #Helicity #High-Energy Particle Collisions Research #Mathematical physics #Non-perturbative #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Propagator #Pseudoscalar #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Quantum mechanics #Quark #Quark model #Quarkonium #hep-ph
paper · pdf · doi:10.1103/physrevc.68.015205
published in Physical Review C 68(1) (American Institute of Physics) · 25 pages
arxiv created 2003/06/03 · openalex publication_date 2003/07/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We apply the perturbative chiral quark model to the \ensuremathγ\stackrel\ensuremath→N\ensuremathΔ transition. The four-momentum dependence of the respective transverse helicity amplitudes A1/2 and A3/2 is determined at one loop in the pseudoscalar Goldstone boson fluctuations. Inclusion of excited states in the quark propagator is shown to result in a reasonable description of the experimental values for the helicity amplitudes at the real-photon point.