# Resonance $d^*(2380)$ and higher isospin states

## TL;DR

This paper reports the detection of a new isoscalar dibaryon state, $d^*(2380)$, and explores the existence of higher isospin states through experimental and theoretical analysis of two-pion production in proton-proton collisions.

## Contribution

It presents experimental evidence for the $d^*(2380)$ resonance and theoretical calculations supporting the existence of higher isospin dibaryon states in $pp$ collisions.

## Key findings

- Detection of $d^*(2380)$ resonance at 2380 MeV
- Isotensor dibaryon resonance explains $pp\to pp\pi^+\pi^-$ data
- Good agreement between calculations and experimental cross sections

## Abstract

A new isoscalar state in the two-baryon system with mass 2380 MeV and width 80 MeV denoted now $d^*(2380)$ has been detected in the experiments at the Juelich Cooler Synchrotron (COSY). Existence or influence of states with higher isospin is a subject of the experiment for studing of the $\pi^+\pi^-$ production in $pp$ collisions. Calculations taking into account isotensor dibaryon resonance in the $\Delta N$ with $I(J^p) = 2(1^+)$ provide a good description of the $pp\to pp\pi^+\pi^-$ total and differential cross sections.