# 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

# Observation of a structure in the M$_{p\eta}$ invariant mass distribution near 1700 MeV in the $\gamma p \rightarrow p \pi^0 \eta$ reaction

## Speakers

• Dr. Mariana NANOVA

## Abstract

The present work extends earlier studies of the reaction gamma p->p pi0 eta and has been motivated by the recently claimed observation of a narrow structure around an excitation energy of 1678 MeV [JETP106(2017)693].The existence of this structure cannot be confirmed. Instead, a statistically significant structure in the M(p eta) invariant mass distribution near 1700MeV is observed.The most likely interpretation is that of a triangular singularity in the gamma p->p a0->p pi0 eta reaction.