Measurement of the \(e^{+}e^{-}\rightarrow\eta\pi^{+}\pi^{-}\) cross section with the CMD-3 detector at the VEPP-2000 collider

The cross section of the process \(e^{+}e^{-}\rightarrow\eta\pi^{+}\pi^{-}\) 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 \(\eta\rightarrow\gamma\gamma\) is used for \(\et...

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Veröffentlicht in:arXiv.org 2020-01
Hauptverfasser: Gribanov, S S, Popov, A S, Akhmetshin, R R, Amirkhanov, A N, Anisenkov, A V, Aulchenko, V M, V Sh Banzarov, 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, K Yu Mikhailov, 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, P Yu Shatunov, 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
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Sprache:eng
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Zusammenfassung:The cross section of the process \(e^{+}e^{-}\rightarrow\eta\pi^{+}\pi^{-}\) 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 \(\eta\rightarrow\gamma\gamma\) is used for \(\eta\) meson reconstruction in the data sample corresponding to an integrated luminosity of \(78.3\) pb\(^{-1}\). The energy dependence of the \(e^{+}e^{-}\rightarrow\eta\pi^{+}\pi^{-}\) cross section is fitted within the framework of vector meson dominance in order to extract the \(\Gamma(\rho(1450)\rightarrow{^{+}e^{-}})\mathcal{B}(\rho(1450)\rightarrow\eta\pi^{+}\pi^{-})\) and the \(\Gamma(\rho(1700)\rightarrow{e^{+}e^{-}})\mathcal{B}(\rho(1700)\rightarrow\eta\pi^{+}\pi^{-})\) products. Based on conservation of vector current, the analysed data are used to test the relationship between the \(e^{+}e^{-}\rightarrow\eta\pi^{+}\pi^{-}\) cross section and the spectral function in \(\tau^-\rightarrow\eta\pi^-\pi^0\nu_\tau\) decay. The \(e^{+}e^{-}\rightarrow\eta\pi^{+}\pi^{-}\) cross section measured with the CMD-\(3\) detector is in good agreement with the previous measurements.
ISSN:2331-8422
DOI:10.48550/arxiv.1907.08002