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Study of ${e}^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\pi }^{0}$ at $\sqrt{s}$ from 2.00 to 3.08 GeV at BESIII

2024    CERN İşbirliği

With the data samples taken at center-of-mass energies from 2.00 to 3.08 GeV with the BESIII detector at the BEPCII collider, a partial wave analysis on the ${e}^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\pi }^{0}$ process is performed. The Born cross sections for ${e}^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\pi }^{0}$ and its intermediate processes ${e}^{+}{e}^{-}\to \rho \pi $ and $\rho \left(1450\right)\pi $ are measured as functions of $\sqrt{s}$. The results for ${e}^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\pi }^{0}$ are consistent with previous results measured with the initial state radiation method within one standard deviation, and improve the uncertainty by a factor of ten. By fitting the line shapes of the Born cross sections for the ${e}^{+}{e}^{-}\to \rho \pi $ and ${e}^{+}{e}^{-}\to \rho \left(1450\right)\pi $, a structure with mass $M=2119±11±15\text{}\text{}\mathrm{MeV}/{c}^{2}$ and width $\Gamma =69±30±5\text{}\text{}\mathrm{MeV}$ is observed with a significance of $5.9\sigma $, where the first uncertainties are statistical and the second ones are systematic. This structure can be interpreted as an excited $\omega $ state.