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M. N. Achasov; A. Yu. Barnyakov; M. Yu. Barnyakov; A. A. Baykov; K. I. Beloborodov; A. V. Berdyugin; D. E. Berkaev; A. G. Bogdanchikov; A. A. Botov; A. R. Buzykaev; T. V. Dimova; V. P. Druzhinin; V. B. Golubev; L. V. Kardapoltsev; A. G. Kharlamov; A. A. Korol; D. P. Kovrizhin; E. A. Kravchenko; A. S. Kupich; A. P. Lysenko; K. A. Martin; N. Yu. Muchnoy; N. A. Melnikova; A. E. Obrazovsky; A. P. Onuchin; E. V. Pakhtusova; E. A. Perevedentsev; K. V. Pugachev; Y. S. Savchenko; S. I. Serednyakov; P. Yu. Shatunov; Yu. M. Shatunov; D. A. Shtol; D. B. Shwartz; Z. K. Silagadze; I. K. Surin; Yu. A. Tikhonov; Yu. V. Usov; I. M. Zemlyansky; V. N. Zhabin; V. V. Zhulanov
The European physical journal. C, Particles and fields, 12/2020, Volume: 80, Issue: 12Journal Article
Abstract The process $$e^+e^-\rightarrow K^+K^-\pi ^0$$ e + e - → K + K - π 0 is studied with the SND detector at the VEPP-2000 $$e^+e^-$$ e + e - collider. Basing on data with an integrated luminosity of 26.4 $$\hbox {pb}^{-1}$$ pb - 1 we measure the $$e^+e^-\rightarrow K^+K^-\pi ^0$$ e + e - → K + K - π 0 cross section in the center-of-mass energy range from 1.28 up to 2 GeV. The measured mass spectrum of the $$K\pi $$ K π system indicates that the dominant mechanism of this reaction is the transition through the $$K^{*}(892)K$$ K ∗ ( 892 ) K intermediate state. The cross section for the $$\phi \pi ^0$$ ϕ π 0 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 $$\phi \pi ^0$$ ϕ π 0 and $$K^*K$$ K ∗ K amplitudes. It is found that the interference gives sizable contribution to the measured $$e^+e^- \rightarrow \phi \pi ^0\rightarrow K^+K^-\pi ^0$$ e + e - → ϕ π 0 → K + K - π 0 cross section below 1.7 GeV.
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