European Physical Journal C: Particles and Fields (2020-12-01)

Measurement of the $$e^+e^- \rightarrow K^+ K^- \pi ^0$$ e + e - → K + K - π 0 cross section with the SND detector

  • 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

DOI
https://doi.org/10.1140/epjc/s10052-020-08719-9
Journal volume & issue
Vol. 80, no. 12
pp. 1 – 10

Abstract

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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.