Nature of S-wave NN interaction and dibaryon production at nucleonic resonance thresholdsстатья
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Аннотация:Phase shifts and inelasticity parameters for NN scattering in the partial-wave channels 3S1–3D1 and 1S0 at energies Tlab 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(Jπ)=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.