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ISSN - 10637788, EISSN - 1562692X, Physics of Atomic Nuclei, 2015, vol. 78, 4, p. 497-508

New results of measurement of cross sections for electron-positron annihilation to hadrons with the SND detector at VEPP-2000

Aulchenko V. M., Achasov M. N., Barnyakov A. Yu, Beloborodov K. I., Berdyugin A. V., Berkaev D. E., Bogdanchikov A. G., Botov A. A., Vasiljev A. V., Golubev V. B., Dimova T. V., Druzhinin V. P., Kardapoltsev L. V., Kasaev A. S., Kirpotin A. N., Kovrizhin D. P., Koop I. A., Korol A. A., Koshuba S. V., Kupich A. S., Lysenko A. P., Martin K. A., Obrazovsky A. E., Pakhtusova E. V., Perevedentsev E. A., Rogovsky Yu A., Romanov A. L., Senchenko A. I., Serednyakov S. I., Silagadze Z. K., Skrinsky A. N., Surin I. K., Tikhonov Yu A., Kharlamov A. G., Shatunov Yu M., Shtol D. A.

© 2015, Pleiades Publishing, Ltd. A survey of preliminary results of experiments with the SND detector at the VEPP-2000 e<sup>+</sup>e<sup>−</sup> collider in the energy range of $\sqrt s $ = 1000–2000 MeV MeV is presented. The cross sections for the processes e<sup>+</sup>e<sup>−</sup> → π<sup>0</sup>π<sup>0</sup>γ, e<sup>+</sup>e<sup>−</sup> → π<sup>+</sup>π<sup>−</sup>π<sup>0</sup>π<sup>0</sup>, e<sup>+</sup>e<sup>−</sup> → π<sup>+</sup>π<sup>−</sup>π<sup>0</sup>, e<sup>+</sup>e<sup>−</sup> → π<sup>+</sup>π<sup>−</sup>η, and e<sup>+</sup>e<sup>−</sup> → $p\bar p$ were measured. The measured cross sections agree with the results of earlier measurements but have a higher precision. The cross section for the process e<sup>+</sup>e<sup>−</sup> → ηγ in the energy range extending from 1.4 to 2 GeV was measured for the first time. The ratio G<inf>E</inf>/G<inf>M</inf> for the neutron was measured for the first time in the timelike region.