An observation of the $f_0(1710)$ meson in the $\omega\phi$ system in the Pion-$Be$ Interaction at Momentum of 29 GeV

Author:

V. A. Dorofeev, D. R. Eremeev, V. G. Gotman, A. V. Ivashin, I. A. Kachaev, Yu. A. Khokhlov, M. S. Kholodenko, V. F. Konstantinov, V. I. Lisin, V. D. Matveev, E. V. Nazarov, V. I. Nikolaenko, A. N. Plekhanov, D. I. Ryabchikov, A. A. Shumakov, V. P. Sugonyaev, A. M. Zaitsev

Keyword:

High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Nuclear Experiment (nucl-ex)

journal:

date:

2023-06-12 16:00:00

Abstract

The charge-exchange reaction $\pi^-p \rightarrow n\,\omega(783)\phi(1020)$, $\omega \rightarrow \pi^+\pi^-\pi^0$, $\phi \rightarrow K^+K^-$ is studied with the upgraded VES facility (U-70, Protvino) in the interaction of a 29 GeV pion beam with a beryllium target. The distribution over the invariant mass of the system $M_{\omega\phi}$ shows a near-threshold signal. A partial wave analysis reveals that the scalar state ($J^{PC}=0^{++}$) dominates in this mass region. The observed signal can be described with a contribution of the known resonance $f_0(1710)$. Using OPE approximation for the reaction $\pi^-p \rightarrow n\, f_0(1710)$ the product of branching fractions is found to be: $Br(f_0(1710)\rightarrow \pi\pi)\cdot Br(f_0(1710)\rightarrow \omega\phi) = (4.8 \pm 1.2) \cdot 10^{-3}$.

PDF: An observation of the $f_0(1710)$ meson in the $\omega\phi$ system in the Pion-$Be$ Interaction at Momentum of 29 GeV.pdf