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  • Measurement of the \(e^+e^-\to\pi^+\pi^-\pi^0\) cross section from 0.7 GeV to 3.0 GeV via initial-state radiation
    Berger, N; Bertani, M; Bettoni, D; Bloms, J; Cetin, S A; Chang, J F; Chang, W L; Chen, G; Chen, X R; Chen, Y B; Cheng, W; Denig, A; Dong, M Y; Farinelli, R; Garillon, B; Gersabeck, E M; Goetzen, K; Gong, L; Gradl, W; Guo, L B; Guskov, A; Heinsius, F H; Huang, X Z; Ji, Q P; Jiang, H L; Kappert, R; Kupsc, A; Kurth, M; Li, D M; Li, H B; Liang, Y T; Liao, G R; Liu, D Y; Liu, F H; Liu, H B; Liu, Huanhuan; Liu, J B; Liu, L Y; Y Lu; Luo, P W; Luo, X L; Lyu, X R; Ma, M M; Ma, Q M; Maggiora, M; Messchendorp, J G; Min, T J; N Yu Muchnoi; Pacetti, S; Pan, Y; Papenbrock, M; Pelizaeus, M; Ping, R G; Prasad, V; Qin, Z H; M Rolo; Rong, G; Sarantsev, A; Shi, X D; Song, J J; Sowa, C; Sun, S S; Sun, Y K; Tan, Y T; Tang, G Y; Tang, X; Wang, D Y; Wang, M Z; Wang, X; Wang, X F; Wang, X L; Wang, Z G; Wen, S P; Xu, J J; Xu, Q J; Yan, W B; Yang, H X; Yang, S L; Yang, Y H; Yu, B X; Yu, C X; Yu, J S; Yuan, X Q; Yuncu, A; Zeng, Y; Zhang, C C; Zhang, H Y; Zhang, J Q; Zhang, J Y; Zhang, J Z; Zhang, Lei; Zhang, X Y; Zhang, Y H; Zhang, Yang; Zhang, Yu; Zhao, G; Zhong, B; Zhu, Y C; Zhu, Z A; Zou, J H

    arXiv.org, 12/2019
    Paper

    The cross section of the process \(e^+e^-\to\pi^+\pi^-\pi^0\) is measured with a precision of 1.6% to 25% in the energy range between \(0.7\) and 3.0 GeV using the Initial State Radiation method. A data set with an integrated luminosity of \(2.93\)fb\(^{-1}\) taken at the center-of-mass energy of \(\sqrt{s}=3.773\)GeV with the BESIII detector at the BEPCII collider is used. The product branching fractions for \(\omega\), \(\phi\), \(\omega(1420)\), and \(\omega(1650)\) are measured to be \(\mathcal{B}(\omega\to e^+e^-) \times \mathcal{B}(\omega \to \pi^+\pi^-\pi^0)=(6.94\pm0.08\pm0.16) \times 10^{-5}\), \(\mathcal{B}(\phi\to e^+e^-) \times \mathcal{B}(\phi\to\pi^+\pi^-\pi^0) = (4.20\pm0.08\pm0.19) \times 10^{-5}\), \(\mathcal{B}(\omega(1420)\to e^+e^-) \times \mathcal{B}(\omega(1420) \to \pi^+\pi^-\pi^0) = (0.84\pm0.09\pm0.09) \times 10^{-6}\), and \(\mathcal{B}(\omega(1650) \to e^+e^) \times \mathcal{B}(\omega(1650)\to \pi^+\pi^-\pi^0) = (1.14\pm0.15\pm0.15)\times10^{-6}\), respectively. The branching fraction \(\mathcal{B}(J/\psi\to \pi^+\pi^-\pi^0)\) is measured to be \((2.188 \pm 0.024 \pm 0.024 \pm0.040 (\Gamma_{ee}^{J/\psi}))\%\), where \(\Gamma_{ee}^{J/\psi}\) is the dileptonic width of \(J/\psi\). The first errors are of statistical, the second and third ones of systematic nature.

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