New measurement of the rare decay $\eta \to \pi^0\gamma\gamma$ with the Crystal Ball/TAPS detectors at the Mainz Microtron

The A2 at MAMI collaboration Nefkens, B.M.K. ; Prakhov, S. ; Aguar-Bartolome, P. ; et al.
Phys.Rev. C90 (2014) 025206, 2014.
Inspire Record 1297221 DOI 10.17182/hepdata.64169
1 data table

D(WIDTH(ETA --> PI0 GAMMA GAMMA))/DM**2(GAMMA GAMMA) obtained from the data of 2007 and 2009 and their average. The error on the average is the total error.