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  • Measurement of the e+e−→ ηπ...
    Gribanov, S. S.; Popov, A. S.; Akhmetshin, R. R.; Amirkhanov, A. N.; Anisenkov, A. V.; Aulchenko, V. M.; Banzarov, V. Sh; Bashtovoy, N. S.; Berkaev, D. E.; Bondar, A. E.; Bragin, A. V.; Eidelman, S. I.; Epifanov, D. A.; Epshteyn, L. B.; Erofeev, A. L.; Fedotovich, G. V.; Gayazov, S. E.; Grancagnolo, F. J.; Grebenuk, A. A.; Grigoriev, D. N.; Ignatov, F. V.; Ivanov, V. L.; Karpov, S. V.; Kazanin, V. F.; Kirpotin, A. N.; Koop, I. A.; Korobov, A. A.; Kovalenko, O. A.; Kozyrev, A. N.; Kozyrev, E. A.; Krokovny, P. P.; Kuzmenko, A. E.; Kuzmin, A. S.; Logashenko, I. B.; Lukin, P. A.; Mikhailov, K. Yu; Okhapkin, V. S.; Otboev, A. V.; Pestov, Yu. N.; Razuvaev, G. P.; Rogovsky, Yu. A.; Ruban, A. A.; Ryskulov, N. M.; Ryzhenenkov, A. E.; Semenov, A. V.; Senchenko, A. I.; Shatunov, Yu. M.; Shatunov, P. Yu; Shebalin, V. E.; Shemyakin, D. N.; Shwartz, B. A.; Shwartz, D. B.; Sibidanov, A. L.; Solodov, E. P.; Titov, V. M.; Talyshev, A. A.; Tolmachev, S. S.; Vorobiov, A. I.; Zemlyansky, I. M.; Yudin, Yu. V.

    The journal of high energy physics, 01/2020, Letnik: 2020, Številka: 1
    Journal Article

    A bstract The cross section of the process e + e − → ηπ + π − is measured using the data collected with the CMD-3 detector at the VEPP-2000 collider in the center-of-mass energy range from 1 . 1 to 2 . 0 GeV. The decay mode η → γγ is used for η meson reconstruction in the data sample corresponding to an integrated luminosity of 78 . 3 pb − 1 . The energy dependence of the e + e − → ηπ + π − cross section is fitted within the framework of vector meson dominance in order to extract the Γ( ρ (1450) → e + e − ) B ( ρ (1450) → ηπ + π − ) and the Γ( ρ (1700) → e + e − ) B ( ρ (1700) → ηπ + π − ) products. Based on conservation of vector current, the analyzed data are used to test the relationship between the e + e − → ηπ + π − cross section and the spectral function in τ − → ηπ − π 0 ντ decay. The e + e − → ηπ + π − cross section obtained with the CMD-3 detector is in good agreement with the previous measurements.