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arXiv · hep-ex/9907026

Investigation of the $e^+e^- \to ωπ^0 \to π^0 π^0 γ$ reaction in the energy domain near the $ϕ$-meson

M. N. Achasov·V. M. Aulchenko·A. V. Berdyugin·A. V. Bozhenok·D. A. Bukin·S. V. Burdin·T. V. Dimova·V. P. Druzhinin·M. S. Dubrovin·I. A. Gaponenko·V. B. Golubev·V. N. Ivanchenko·I. A. Koop·A. A. Korol·S. V. Koshuba·E. V. Pakhtusova·A. A. Salnikov·V. V. Shary·S. I. Serednyakov·Yu. M. Shatunov·V. A. Sidorov·Z. K. Silagadze·A. A. Valishev
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Abstract

The $e^+e^- \to ωπ^0 \to π^0 π^0 γ$ process was investigated in the SND experiment at the VEPP-2M collider. A narrow energy interval near the $ϕ$-meson was scanned. The observed cross-section reveals, at the level of three standard deviation, the interference effect caused by $ϕ\to π^0π^0γ$ decay. The cross-section parameters, as well as the real and imaginary parts of the $ϕ$-meson related amplitude, were measured.

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M. N. Achasov, V. M. Aulchenko, A. V. Berdyugin, A. V. Bozhenok, D. A. Bukin, S. V. Burdin, T. V. Dimova, V. P. Druzhinin, M. S. Dubrovin, I. A. Gaponenko, V. B. Golubev, V. N. Ivanchenko, I. A. Koop, A. A. Korol, S. V. Koshuba, E. V. Pakhtusova, A. A. Salnikov, V. V. Shary, S. I. Serednyakov, Yu. M. Shatunov, V. A. Sidorov, Z. K. Silagadze, A. A. Valishev. 2008-03-31. Investigation of the $e^+e^- \to ωπ^0 \to π^0 π^0 γ$ reaction in the energy domain near the $ϕ$-meson. https://doi.org/10.1016/s0550-3213(99)00482-4

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