https://doi.org/10.1140/epjc/s10052-020-08524-4
Regular Article – Experimental Physics
Study of dynamics of the process
in the energy range 1.15–2.00 GeV
SND Collaboration
1
Budker Institute of Nuclear Physics, SB RAS, 630090, Novosibirsk, Russia
2
Novosibirsk State University, 630090, Novosibirsk, Russia
Received:
30
July
2020
Accepted:
6
October
2020
Published online:
27
October
2020
The dynamics of the process is studied in the energy region from 1.15 to 2.00 GeV using data accumulated with the SND detector at the VEPP-2000
collider. The Dalitz plot distribution and
mass spectrum are analyzed in a model including the intermediate states
,
, and
. As a result, the energy dependences of the
and
cross sections and the relative phases between the
amplitude and the
and
amplitudes are obtained. The
cross section has a peak in the energy region of the
resonance (1.55–1.75 GeV). In this energy range the contributions of the
and
states are of the same order of magnitude. No resonance structure near 1.65 GeV is observed in the
cross section. We conclude that the intermediate state
gives a significant contribution to the decay of
, whereas the
mechanism dominates in the decay
.
© The Author(s) 2020
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