The Roper Resonance $N^*(1440)$ in Nucleon-Nucleon Collisions and the Issue of Dibaryons

TL;DR

This paper investigates the detection of the Roper resonance in nucleon-nucleon collisions, highlighting the formation of dibaryonic systems and analyzing specific production channels to understand its properties.

Contribution

It provides new insights into the formation of $N^*(1440)N$ dibaryonic systems and clarifies the resonance's role in nucleon-nucleon interactions.

Findings

Identification of Roper resonance in specific production channels

Evidence for $N^*(1440)N$ dibaryonic system formation

Analysis of resonance properties at 1370 MeV

Abstract

In many reactions leading to excitations of the nucleon the Roper resonance $N^*(1440)$ can be sensed only by complex partial-wave analyses. In nucleon-nucleon collisions the isoscalar single-pion production as well as specific two-pion production channels present the Roper excitation free of competing resonance processes at a mass of 1370 MeV and a width of 150 MeV. A detailed analysis points to the formation of $N^*(1440)N$ dibaryonic systems during the nucleon-nucleon collision process similar to what is known from the $\Delta(1232)N$ threshold.