arXiv · 1610.00235
Updated measurement of the $e^+e^- \to ωπ^0 \to π^0π^0γ$ cross section with the SND detector
Abstract
We analyze a 37 pb$^{-1}$ data sample collected with the SND detector at the VEPP-2000 $e^+e^-$ collider in the center-of-mass energy range 1.05--2.00 GeV and present an updated measurement of the $e^+e^- \to ωπ^0 \to π^0π^0γ$ 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 $τ^-\toωπ^-ν_τ$ decay.
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M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, L. V. Kardapoltsev, A. S. Kasaev, A. G. Kharlamov, A. N. Kirpotin, D. P. Kovrizhin, I. A. Koop, A. A. Korol, S. V. Koshuba, K. A. Martin, A. E. Obrazovsky, E. V. Pakhtusova, Yu. A. Rogovsky, A. I. Senchenko, S. I. Serednyakov, Z. K. Silagadze, Yu. M. Shatunov, D. A. Shtol, D. B. Shwartz, A. N. Skrinsky, I. K. Surin, A. V. Vasiljev. 2016-10-05. Updated measurement of the $e^+e^- \to ωπ^0 \to π^0π^0γ$ cross section with the SND detector. https://doi.org/10.1103/physrevd.94.112001
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