Complete Relativistic Description of the N*(1520)

Details Complete Relativistic Description of the N*(1520) Complete Relativistic Description of the N*(1520)

2006-01-24

arxiv.org/abs/nucl-th/0601072v1

Nucl.Phys.A778:53-94,2006

Physics

Nuclear Physics

Nuclear Theory

32 pages, 40 figures

Scientific paper

10.1016/j.nuclphysa.2006.07.039

A relativistic description of spin 3/2 resonances and their decay channels is presented by calculating their selfenergies and spectral functions. The full vector-spinor structure is taken into account. Special emphasis is put on the N*(1520) and its decay channels pi N, rho N and pi \Delta. All interactions are formulated such that only the correct number of degrees of freedom of a spin 3/2 state is propagated. The obtained results are compared with several approximations frequently used to avoid the complicated vector-spinor structure. Since this structure is taken fully into account here, the quality of the approximations can be judged.

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