https://doi.org/10.1140/epjc/s10052-020-08719-9
Regular Article – Experimental Physics
Measurement of the
cross section with the SND detector
The SND Collaboration
1
Budker Institute of Nuclear Physics, SB RAS, 630090, Novosibirsk, Russia
2
Novosibirsk State University, 630090, Novosibirsk, Russia
Received:
13
July
2020
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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