1996/12/23 by Nimai C. Mukhopadhyay, J. -F. Zhang, Mukhopadhyay, Nimai C. +4
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th
paper · pdf · doi:10.48550/arxiv.nucl-th/9612061
9 pages, 3 figures
arxiv created 1996/12/23 · openalex publication_date 1996/12/23 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We analyze the available data on eta photo- and electroproduction, around W~1535 MeV, in the framework of the effective Lagrangian approach, and extract, in a nearly model-independent fashion, the electrostrong amplitude for the gamma+N--> N*(1535)--> N+eta processes. Quark model approaches are shown to be quite inadequate to explain this property at all Q2. In particular, at high Q2, the extracted amplitude falls much slower than the predictions of the quark model, as a function of Q2, a situation similar to the electroexcitation and decay of Delta(1232). A QCD explanation of these observations is urgently needed.