ISSN 0253-2778

CN 34-1054/N

open

A coherent study of e+eωπ0, ωπ+π, and ωη

  • In this work, a combined analysis is performed on the processes of e^+e^-\to\omega\pi^0\pi^0, e^+e^-\to\omega\pi^+\pi^-, and e^+e^-\to\omega\eta to study possible \omega excited states at approximately 2.2 GeV. The resonance parameters are extracted by simultaneous fits of the Born cross section line shapes of these processes. In the fit with one resonance, the mass and width are fitted to be (2207\pm14) MeV/c^2 and (104\pm16) MeV, respectively. The result is consistent with previous measurements. In the fit with two resonances, the mass and width for the first resonance are fitted to be (2160\pm36) MeV/c^2 (solution I), (2154\pm12) MeV/c^2 (solution II) and (141\pm74) MeV (solution I), (152\pm77) MeV (solution II), respectively. The mass and width for the second resonance are fitted to be (2298\pm19) MeV/c^2 (solution I), (2309\pm6) MeV/c^2 (solution II) and (106\pm77) MeV (solution I), (99\pm23) MeV (solution II), respectively. The result is consistent with the theoretical prediction of \omega(4S) and \omega(3D). The intermediate subprocesses in e^+e^-\to\omega\pi^+\pi^- are analyzed using the resonance parameters of the previous fits in this work. In the fit with one resonance, the fitting result of \varGamma^e^+e^-_\rmRB_\rmR is partially consistent with the previous result. In the fit with two resonances, the fitting result of \varGamma^e^+e^-_\rmRB_\rmR is of the same order of magnitude as the theoretical prediction. This work may provide useful information for studying the light flavor vector meson family.
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