# 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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# Contribution Parallel

Mexico City -
Baryon Spectroscopy

# Coherent double neutral pion and eta meson photoproduction on the deuteron

## Speakers

• Dr. Takatsugu ISHIKAWA

## Abstract

Coherent photoproduction of the neutral pion and eta meson on the deuteron has been experimentally studied at incident photon energies below 1.15 GeV. A strong enhancement is observed near the $\eta d$ threshold over the three-body phase-space contribution in the $\eta d$ invariant-mass distribution. We report the reaction mechanism and $\eta d$ peak structure based on Ref. [T. Ishikawa et al, arXiv: 2105.10887 (2021)].