Rare radiative decay ϕ→ηπ0γ was studied with SND detector at {VEPP-2M} electron-positron collider and its branching ratio was measured: B(ϕ→ηπ0γ)=(0.88±0.14±0.09)⋅10−4. Significant contribution of the a0(980)γ intermediate state was observed in the decay. The result is based on total integrated luminosity corresponding to 2⋅107 produced ϕ mesons.
@article{arxiv.hep-ex/0003031,
title = {The $\phi\to\eta\pi^0\gamma$ decay},
author = {M. N. Achasov and S. E. Baru and K. I. Beloborodov and A. V. Berdyugin and A. V. Bozhenok and A. D. Bukin and D. A. Bukin and S. V. Burdin and T. V. Dimova and S. I. Dolinsky and V. P. Druzhinin and M. S. Dubrovin and I. A. Gaponenko and V. B. Golubev and V. N. Ivanchenko and A. A. Korol and M. S. Korostelev and S. V. Koshuba and A. A. Mamutkin and E. V. Pakhtusova and E. E. Pyata and A. A. Salnikov and S. I. Serednyakov and V. V. Shary and Yu. M. Shatunov and V. A. Sidorov and Z. K. Silagadze and A. N. Skrinsky and A. V. Vasiljev},
journal= {arXiv preprint arXiv:hep-ex/0003031},
year = {2019}
}