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Theory of Eta Photo- and Electroproduction | | Nimai C. Mukhopadhyay
; J. -F. Zhang
; M. Benmerrouche
; | | Date: |
23 Dec 1996 | | Abstract: | 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 Q^2. In particular, at high Q^2, the extracted amplitude falls much slower than the predictions of the quark model, as a function of Q^2, a situation similar to the electroexcitation and decay of Delta(1232). A QCD explanation of these observations is urgently needed. | | Source: | arXiv, nucl-th/9612061 | | Services: | Forum | Review | PDF | Favorites | |
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