Updated measurement of the $e^+e^- \to \omega \pi^0 \to \pi^0\pi^0\gamma$ cross section with the SND detector
/ Authors
M. N. Achasov, A. Barnyakov, K. Beloborodov, A. Berdyugin, D. Berkaev, A. Bogdanchikov, A. Botov, T. Dimova, V. Druzhinin, V. Golubev
and 21 more authors
L. V. Kardapoltsev, A. Kasaev, A. Kharlamov, A. Kirpotin, D. Kovrizhin, I. Koop, A. Korol, S. Koshuba, K. Martin, A. Obrazovsky, E. Pakhtusova, Y. Rogovsky, A. Senchenko, S. Serednyakov, Z. Silagadze, Y. Shatunov, D. Shtol, D. Shwartz, A. Skrinsky, I. Surin, A. Vasiljev
/ Abstract
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.