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  • Measurement of the \(e^+e^- \to \eta\pi^+\pi^-\) cross section in the center-of-mass energy range 1.22--2.00 GeV with the SND detector at the VEPP-2000 collider
    Aulchenko, V M; Achasov, M N; A Yu Barnyakov; Beloborodov, K I; Berdyugin, A V; Bogdanchikov, A G; Botov, A A; Dimova, T V; Druzhinin, V P; Golubev, V B; Kardapoltsev, L V; Kharlamov, A G; Koop, I A; Korol, A A; Koshuba, S V; Kovrizhin, D P; Kupich, A S; Martin, K A; Obrazovsky, A E; Pakhtusova, E V; Senchenko, A I; Serednyakov, S I; Silagadze, Z K; Shatunov, Yu M; Shatunov, P Ju; Shtol, D A; Shwartz, D B; Skrinsky, A N; Surin, I K; Tikhonov, Yu A; Usov, Yu V; Vasiljev, A V

    arXiv.org, 03/2015
    Paper

    In the experiment with the SND detector at the VEPP-2000 \(e^+e^-\) collider the cross section for the process \(e^+e^-\to\eta\pi^+\pi^-\) has been measured in the center-of-mass energy range from 1.22 to 2.00 GeV. Obtained results are in agreement with previous measurements and have better accuracy. The energy dependence of the \(e^+e^-\to\eta\pi^+\pi^-\) cross section has been fitted with the vector-meson dominance model. From this fit the product of the branching fractions \(B(\rho(1450)\to\eta\pi^+\pi^-)B(\rho(1450)\to e^+e^-)\) has been extracted and compared with the same products for \(\rho(1450)\to\omega\pi^0\) and \(\rho(1450)\to\pi^+\pi^-\) decays. The obtained cross section data have been also used to test the conservation of vector current hypothesis.

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