Nature of $$\varvec{S}$$S -wave $$\varvec{NN}$$NN interaction and dibaryon production at nucleonic resonance thresholds
2020
Phase shifts and inelasticity parameters for NN scattering in the partial-wave channels
$${}^3S_1$$
–
$${}^3D_1$$
and
$${}^1S_0$$
at energies
$$T_\mathrm{lab}$$
from zero to about 1 GeV are described within a unified NN potential model assuming the formation of isoscalar and isovector dibaryon resonances near the
$$NN^*(1440)$$
threshold. Evidence for these near-threshold resonances is actually found in the recent WASA experiments on single- and double-pion production in NN collisions. There, the excitation of the Roper resonance
$$N^*(1440)$$
exhibits a structure in the energy dependence of the total cross section which corresponds to the formation of dibaryon states with
$$I(J^\pi )=0(1^+)$$
and
$$1(0^+)$$
at the
$$NN^*(1440)$$
threshold. These two S-wave dibaryon resonances may provide new insight into the nature of the strong NN interaction at low and intermediate energies.
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