# Photo-absorption on deuteron contributed by d^*(2380) resonance

## TL;DR

This paper calculates the photo-absorption cross section on deuteron due to the $d^*(2380)$ resonance, finding it significantly smaller than experimental data, and explores its structure as a six-quark system.

## Contribution

It provides a theoretical calculation of the photo-absorption cross section involving the $d^*(2380)$ resonance considering its internal structure as a six-quark system.

## Key findings

- Calculated cross section is about 10 nb, much smaller than experimental data.
- Only next-to-leading order terms contribute significantly.
- The model supports $d^*(2380)$ as a compact six-quark state.

## Abstract

In order to understand the possible physical nature of the newly observed resonance $d^*(2380)$, we calculate the real photo-absorption cross section on deuteron contributed by the resonance $d^*(2380)$ by considering the electromagnetic transition amplitude of $\gamma +d\rightarrow d^*(2380)$. In our interpretation, the $d^*(2380)$ is regarded as a compact six-quark system with mainly two components of $\Delta\Delta$ and hidden-color clusters $C_8C_8$. We find that only the next-to-leading terms contribute the $\gamma +d\rightarrow d^*(2380)$ and the obtained photo-absorption cross section is quite small which is in the order of 10 $nb$. Compared with data measured at ELPH and Mainz recently, it is almost about 20 times smaller.