Regular Article – Experimental Physics
Study of the process in the energy range GeV with the SND detector
Budker Institute of Nuclear Physics, SB RAS, 630090, Novosibirsk, Russia
2 Novosibirsk State University, 630090, Novosibirsk, Russia
Accepted: 14 October 2020
Published online: 1 November 2020
The process is studied in the center-of-mass energy range 1.05–2.00 GeV using data with an integrated luminosity of 94.5 collected by the SND detector at the VEPP-2000 collider. The cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the intermediate state. The measured cross section of the subprocess is consistent with previous measurements in the mode. It is found, with a significance of , that the process is not completely described by hadronic vector-pseudoscalar intermediate states. The cross section of this missing contribution, which can originate from radiation processes, e. g. , is measured. It is found to be 15–20 pb in the wide energy range from 1.3 to 1.9 GeV.
© The Author(s) 2020
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