Electromagnetic transitions of excited baryons in a deformed oscillator quark model

Details Electromagnetic transitions of excited baryons in a deformed oscillator quark model Electromagnetic transitions of excited baryons in a deformed oscillator quark model

1999-10-25

arxiv.org/abs/hep-ph/9910469v2

Nucl.Phys. A678 (2000) 147-174

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, 3 figures, LaTeX2e, epsf.sty and AMSLaTeX package are required; typos corrected, published version

Scientific paper

10.1016/S0375-9474(00)00319-5

We study electromagnetic transitions of excited baryons in a deformed oscillator quark model, where baryon excited states are described as rotational bands of deformed intrinsic states. We describe all necessary tools to compute transition amplitudes in multipole basis, which are then related to the commonly used helicity amplitudes. We pay a special attention on the sign of the amplitudes as well as their absolute values by computing the photon and pion couplings simultaneously. We have found that the effect of deformation on the transition amplitudes is rather weak. The difficulty in reproducing the empirical amplitude of the Roper state is discussed.

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