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NN scattering with NDelta coupling: Dibaryon resonances without "dibaryons"?. (arXiv:2305.08647v2 [nucl-th] UPDATED)

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It is known that at their threshold intermediate two-baryon NDelta states can
produce resonance-like structures in some isospin one states, often interpreted
as more exotic manifest six-quark states. This paper applies the
coupled-channel method to study details of the NDelta effect in isospin one NN
scattering with interactions constrained to exclude the influence of such
extraneous hypothetical particles in two respects. Firstly, the calculated
phase parameters are fitted below pion inelasticity, i.e. far below the region
of "dibaryons". Secondly, the strength of the NN --> NDelta transition is
constrained to agree with the pion production reaction NN --> dpi, fairly
independent of the details of the pure "diagonal" NN potential and its effect
practically as strong as the NN itself. The results may be considered as a
necessary background for searches of additional dibaryon effects. Optimal
conditions for resonant NDelta appearances involve a decrease of the orbital
angular momentum in the transition NN --> NDelta, as is the case in the 1D2 and
3F3 waves. Also the effective NDelta threshold as well as its width are state
dependent. Detailed complex phase shift results are presented for isospin one
partial waves up to J=6, where NDelta excitation is still found to be
comparable to or even larger than one pion exchange.

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