# 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman

26-31 July 2021
Mexico City
Mexico/General timezone
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Mexico City -
Baryon Spectroscopy

# The two step mechanism explaining the dibaryon "$d^*(2380)$" peak

## Speakers

• Dr. Raquel MOLINA PERALTA

## Abstract

We study the two step sequential one pion production mechanism,$np(I=0)\to\pi^−pp$, followed by the fusion reaction $pp\to\pi^+d$,to describe the $np\to\pi^+\pi^−d$ reaction where a narrow peak has been identified with a “d(2380)” dibaryon. We find that the second step $pp\to\pi^+d$ is driven by a triangle singularity.Without invoking a dibaryon, the combined cross sections produce a narrow peak with the position,width and strength compatible with the experimental one.