O ct 2 01 6 Updated measurement of the e + e − → ωπ 0 → π 0 π 0 γ cross section with the SND detector

M. N. Achasov, 2 A. Yu. Barnyakov, K. I. Beloborodov, 2 A. V. Berdyugin, 2 D. E. Berkaev, 2 A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, 2 V. P. Druzhinin, 2 V. B. Golubev, 2 L. V. Kardapoltsev, 2, ∗ A. S. Kasaev, A. G. Kharlamov, A. N. Kirpotin, D. P. Kovrizhin, 2 I. A. Koop, 2, 3 A. A. Korol, 2 S. V. Koshuba, K. A. Martin, A. E. Obrazovsky, E. V. Pakhtusova, Yu. A. Rogovsky, A. I. Senchenko, S. I. Serednyakov, Z. K. Silagadze, 2 Yu. M. Shatunov, 2 D. A. Shtol, 2 D. B. Shwartz, 2 A. N. Skrinsky, I. K. Surin, 2 and A. V. Vasiljev 2 Budker Institute of Nuclear Physics, SB RAS, Novosibirsk, 630090, Russia Novosibirsk State University, Novosibirsk, 630090, Russia Novosibirsk State Technical University, Novosibirsk, 630092,Russia We analyze a 37 pb data sample collected with the SND detector at the VEPP-2000 ee collider in the center-of-mass energy range 1.05–2.00 GeV and present an updated measurement of the ee → ωπ → ππγ cross section. In particular, we correct the mistake in radiative correction calculation made in our previous measurement based on a part of the data. The measured cross section is fitted with the vector meson dominance model with three ρ-like states and used to test the conserved vector current hypothesis in the τ− → ωπ−ντ decay.