Direct measurement of the branching ratio for the decay of the η meson into two photons
R. Abegg, R. Abela, A. Boudard, W. Briscoe, M. Clajus, J.-M. Durand, A. Efendiev, B. Fabbro, P. Fuchs, M. Garçon, L. Lytkin, B. Mayer, T. Morrison, B. M. Nefkens, V. Nikulin, J.-F. Pillot, E. Tomasi-Gustafsson, D. White, and W. T. van Oers
pp.
11-19 [
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