arXiv · 2607.11556
Study of the proccess $e^+e^-\to \pi^+\pi^-\pi^0\pi^0\eta$ in the c.m. energy range 1.6--2.0 GeV with the CMD-3 detector
Abstract
The cross section of the process $e^+e^- \to \pi^+\pi^-\pi^0\pi^0\eta$ has been measured using a data sample with the integrated luminosity of 372 pb$^{-1}$ collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. 6300$\pm$145 signal events have been selected in the center-of-mass energy range 1.6--2.0 GeV. The total systematic uncertainty of the cross section is about 10\%. The production dynamics is dominated by the $\omega(782)\pi^0\eta$ final state with a possible small contribution of the $a_0(980)$ resonance in the $\pi^0\eta$ combination. We also observe a presence of the $\rho(770)^{\pm}$ resonance signal in the $\pi^{\pm}\pi^0$ invariant mass distribution.
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R. R. Akhmetshin, A. N. Amirkhanov, A. V. Anisenkova, V. M. Aulchenkoa, N. S. Bashtovoy, E. V. Bedarev, D. E. Berkaev, A. E. Bondar, A. V. Bragin, V. S. Denisov, D. A. Epifanov, L. B. Epshteyn, A. L. Erofeev, G. V. Fedotovich, A. O. Gorkovenko, A. A. Grebenuk, S. S. Gribanov, D. N. Grigoriev, F. V. Ignatov, V. L. Ivanov, A. S. Kasaev, S. V. Karpov, V. F. Kazanin, I. A. Koop, A. A. Korobov, A. N. Kozyrev, P. P. Krokovny, A. S. Kuzmin, I. B. Logashenko, P. A. Lukin, K. Yu. Mikhailov, I. V. Obraztsov, Yu. N. Pestov, E. A. Perevedentsev, V. G. Petrochenko, N. A. Petrov, A. S. Popov, Yu. A. Rogovsky, A. A. Ruban, A. E. Ryzhenenkov, A. V. Semenov, A. I. Senchenko, V. E. Shebalin, D. N. Shemyakin, B. A. Shwartz, D. B. Shwartz, E. P. Solodov, M. V. Timoshenko, V. M. Titov, A. A. Talyshev, S. S. Tolmachev, A. I. Vorobiov, I. M. Zemlyansky, D. S. Zhadan, Yu. V. Yudin. 2026-07-13. Study of the proccess $e^+e^-\to \pi^+\pi^-\pi^0\pi^0\eta$ in the c.m. energy range 1.6--2.0 GeV with the CMD-3 detector. https://arxiv.org/abs/2607.11556
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