Regular Article – Experimental Physics
Measurement of the cross section with the SND detector
The SND Collaboration
Budker Institute of Nuclear Physics, SB RAS, 630090, Novosibirsk, Russia
2 Novosibirsk State University, 630090, Novosibirsk, Russia
Accepted: 28 November 2020
Published online: 11 December 2020
The process is studied with the SND detector at the VEPP-2000 collider. Basing on data with an integrated luminosity of 26.4 we measure the cross section in the center-of-mass energy range from 1.28 up to 2 GeV. The measured mass spectrum of the system indicates that the dominant mechanism of this reaction is the transition through the intermediate state. The cross section for the intermediate state is measured separately. The SND results are consistent with previous measurements in the BABAR experiment and have comparable accuracy. We study the effect of the interference between the and amplitudes. It is found that the interference gives sizable contribution to the measured cross section below 1.7 GeV.
© The Author(s) 2020
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