Please visit Jefferson Lab Event Policies and Guidance before planning your next event: https://www.jlab.org/conference_planning.

# 8th Workshop of the APS Topical Group on Hadronic Physics

10-12 April 2019
Denver, CO
US/Mountain timezone

## A theoretical analysis of $\eta^{\prime}\to\eta\pi\pi$, and of the doubly radiative $\eta^{(\prime)}\to\pi^0\gamma\gamma$ and $\eta^\prime\to\eta\gamma\gamma$ decays

11 Apr 2019, 16:45
20m
Director's Row H (Denver, CO)

### Director's Row H

#### Denver, CO

Sheraton Denver Downtown Hotel, 1550 Court Pl. lobby level of the Plaza building
contributed talk

### Speaker

Dr Sergi Gonzàlez-Solís (Indiana University)

### Description

In the first part of this talk, we present an analysis of the $\eta^{\prime}\to\eta\pi\pi$ decays within the framework of $U(3)_{L}\times U(3)_{R}$ ChPT including resonance states and the complete one-loop corrections. The amplitude is projected in partial waves and unitarized by means of the $N/D$ method resumming both the important $S$-and $D$-wave $\pi\pi$ and the subleading $S$-wave $\pi\eta$ final-state interactions. Using the new data from the A2 collaboration we perform a very precise analysis of this channel and make predictions for the neutral channel that are in good agreement with the BESIII measurement. In the second part of the talk, the rare, doubly radiative decays $\eta^{(\prime)}\to\pi^0\gamma\gamma$ and $\eta^\prime\to\eta\gamma\gamma$ are analysed in terms of scalar and vector meson exchange contributions using the frameworks of the Linear Sigma Model and Vector Meson Dominance, respectively.

### Primary author

Dr Sergi Gonzàlez-Solís (Indiana University)

### Co-authors

Prof. Emilie Passemar (Indiana University and JLab) Mr Emilio Royo (Universitat Autònoma de Barcelona) Prof. Rafel Escribano (IFAE (UAB), Barcelona) Dr Renata Jora (National Institute of Physics and Nuclear Engineering, Bucharest, Romania)

 Slides