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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1986, vol. 174, p. 115-117

Investigation of the reaction e+e- → ηπ+π- in the energy range up to 1.4 GeV

Druzhinin V. P., Dubrovin M. S., Eidelman S. I., Golubev V. B., Ivanchenko V. N., Lysenko A. P., Pakhtusova E. V., Peryshkin A. N., Polunin A. A., Serednyakov S. I., Sidorov V. A., Shatunov Yu M., Skrinsky A. N.

The reaction e+e- → ηπ+π- has been studied with the Neutral Detector in the CM energy range 1.05-1.40 GeV at VEPP-2M. At the maximum energy the cross section exceeds the prediction of the vector dominance with one ρ{variant}(770). The following upper limits for the electron width times branching ratio into ηπ+π- have been obtained for a resonance with a mass of 1.28 GeV and width of 0.08 GeV observed with the Omega-spectrometer at CERN: Λee·Bηππ < 9 eV, and for a ρ{variant}′(1250) with a mass of 1.26 GeV and width of 0.125 GeV: Λee·Bηππ < 14 eV at 90% confidence level. © 1986.