N->Delta Quadrupole Transition in the Constituent Quark Model

Details N->Delta Quadrupole Transition in the Constituent Quark Model N->Delta Quadrupole Transition in the Constituent Quark Model

1999-09-15

arxiv.org/abs/hep-ph/9909385v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, published in the Proceedings of the 8th International Conference on the Structure of Baryons, Bonn, Germany, Sept. 2

Scientific paper

Information on the intrinsic deformation of the proton can be obtained by studying the electromagnetic p-->Delta+ quadrupole transition. Recent experiments have shown that the electric quadrupole (E2) strength in gamma p --> Delta+ is about 10 times larger than predicted by the simple quark model using only one-body currents. Our analysis provides evidence for the dominance of exchange currents in the N-->Delta quadrupole transition and identifies the physical mechanism leading to the observed E2 strength.

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