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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2013, vol. 88, p. -

Study of e+e-→ωπ0→π0π0γ in the energy range 1.05-2.00 GeV with the SND detector

Achasov M. N., Aulchenko V. M., Barnyakov A. Y., Beloborodov K. I., Berdyugin A. V., Bogdanchikov A. G., Botov A. A., Dimova T. V., Druzhinin V. P., Golubev V. B., Grevtsov K. A., Kardapoltsev L. V., Kharlamov A. G., Kovrizhin D. P., Koop I. A., Korol A. A., Koshuba S. V., Lysenko A. P., Martin K. A., Nesterenko I. N., Obrazovsky A. E., Pakhtusova E. V., Perevedentsev E. A., Romanov A. L., Serednyakov S. I., Silagadze Z. K., Skovpen K. Y., Skrinsky A. N., Surin I. K., Tikhonov Y. A., Vasiljev A. V., Shatunov P. Y., Shatunov Y. M., Shtol D. A., Romanov A. L., Zemlyansky I. M.

The cross section for the process e+e -→ωπ0→π0π0γ has been measured in the center-of-mass energy range 1.05-2.00 GeV. The experiment has been performed at the e+e- collider VEPP-2000 with the SND detector. The measured e+e-→ωπ0 cross section above 1.4 GeV is the most accurate to date. Below 1.4 GeV our data are in good agreement with the previous SND and CMD-2 measurements. Data on the e+e -→ωπ0 cross section are well described by the vector meson dominance model with two excited ρ-like states. From the measured cross section we have extracted the γ*→ωπ0 transition form factor. It has been found that the vector meson dominance model cannot describe simultaneously our data and data obtained from the ω→π0μ+μ- decay. We have also tested the conserved vector current hypothesis comparing our results on the e +e-→ωπ0 cross section with data on the τ-→ωπ-ντ decay and have found that the conserved vector current hypothesis works well within the reached experimental accuracy of about 5%. © 2013 American Physical Society.