On the Possibility of Dibaryon Formation near the N*(1440)N threshold -- the Isoscalar Single-Pion Production Revisited

Abstract

The isoscalar single-pion production exhibits a broad bump in the energy dependence of the total cross section, which does not correspond to the usual opening of the $N^{\ast }(1440)$ production channel with subsequent pion decay. In arxiv:2102.05575 it was interpreted as a narrow Breit-Wigner structure, which leads in a sequential single-pion production process to a possible explanation of the $d^{\ast }(2380)$ resonance. We demonstrate that such an attempt fails already, when confronted with the data base for isoscalar single-pion production. We investigate whether the observed bump structure rather points to the formation of dibaryon states with $I(J^P)=0(1^{+})$ and $0(1^{-})$ near the $N^{\ast }(1440)N$ threshold. This situation would be similar to the situation at the $\Delta (1232)N$ threshold, where the signature of a number of dibaryonic resonances has been found.