Measurement of the cross section with the SND detector - The SND Collaboration

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:10.1140/epjc/s10052-020-08719-9

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2020) 80: 1139
https://doi.org/10.1140/epjc/s10052-020-08719-9

Regular Article – Experimental Physics

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

The SND Collaboration

M. N. Achasov¹^,2, A. Yu. Barnyakov¹^,2, M. Yu. Barnyakov¹, A. A. Baykov¹^,2, K. I. Beloborodov¹^,2, A. V. Berdyugin¹^,2, D. E. Berkaev¹^,2, A. G. Bogdanchikov¹, A. A. Botov¹, A. R. Buzykaev¹, T. V. Dimova¹^,2, V. P. Druzhinin¹^,2, V. B. Golubev¹, L. V. Kardapoltsev¹^,2, A. G. Kharlamov¹^,2, A. A. Korol¹^,2, D. P. Kovrizhin¹, E. A. Kravchenko¹^,2, A. S. Kupich¹, A. P. Lysenko¹, K. A. Martin¹, N. Yu. Muchnoy¹^,2, N. A. Melnikova¹, A. E. Obrazovsky¹, A. P. Onuchin¹, E. V. Pakhtusova¹^ac, E. A. Perevedentsev¹^,2, K. V. Pugachev¹^,2, Y. S. Savchenko¹^,2, S. I. Serednyakov¹^,2, P. Yu. Shatunov¹, Yu. M. Shatunov¹^,2, D. A. Shtol¹, D. B. Shwartz¹^,2, Z. K. Silagadze¹^,2, I. K. Surin¹, Yu. A. Tikhonov¹^,2, Yu. V. Usov¹, I. M. Zemlyansky¹^,2, V. N. Zhabin¹ and V. V. Zhulanov¹^,2

¹ Budker Institute of Nuclear Physics, SB RAS, 630090, Novosibirsk, Russia
² Novosibirsk State University, 630090, Novosibirsk, Russia

^ac pakhtusova@inp.nsk.su

Received: 13 July 2020
Accepted: 28 November 2020
Published online: 11 December 2020

Abstract

The process $e^{+} e^{-} \to K^{+} K^{-} π^{0}$ $e^+e^-\rightarrow K^+K^-\pi ^0$ 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 ${pb}^{- 1}$ $\hbox {pb}^{-1}$ we measure the $e^{+} e^{-} \to K^{+} K^{-} π^{0}$ $e^+e^-\rightarrow K^+K^-\pi ^0$ cross section in the center-of-mass energy range from 1.28 up to 2 GeV. The measured mass spectrum of the $K π$ $K\pi$ 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 $ϕ π^{0}$ $\phi \pi ^0$ 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 $ϕ π^{0}$ $\phi \pi ^0$ and $K^{*} K$ $$K^*K$$ amplitudes. It is found that the interference gives sizable contribution to the measured $e^{+} e^{-} \to ϕ π^{0} \to K^{+} K^{-} π^{0}$ $e^+e^- \rightarrow \phi \pi ^0\rightarrow K^+K^-\pi ^0$ cross section below 1.7 GeV.

© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.