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Study of a near-threshold scalar resonance in the \(\omega \phi \) system in pion-Be interaction at momentum of 29 GeV

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Abstract

The charge-exchange reaction \(\pi ^- \text {Be} \rightarrow \text {A}\,\omega (782)\phi (1020)\) with \(\omega \rightarrow \pi ^+\pi ^-\pi ^0\) and \(\phi \rightarrow K^+K^-\) is studied with the upgraded VES facility (U-70, Protvino) using a 29 GeV pion beam. The distribution of the \(\omega \phi \) invariant mass shows a near-threshold enhancement. Partial-wave analysis reveals that an isoscalar scalar state with \(J^{PC}=0^{++}\) dominates in this mass region. Considering the observed signal as an \(f_0\) resonance, and using the one-pion-exchange model, the product of the branching fractions into two channels \(Br(f_0\rightarrow \pi \pi ) Br(f_0\rightarrow \omega \phi )\) is measured. Based on this value, a large partial width is found for the radiative decay of \(J/\psi \) into this state, which suggests a significant glueball component. The result is discussed under alternative assumptions concerning an identification of the observed signal as \(f_0(1710)\) or \(f_0(1770)\).

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Data availibility statement

Data will be made available on reasonable request. [Author’s comment: The datasets analysed during the current study are not currently available due to technical constraints. The data obtained in the study are available from the corresponding author upon reasonable request.]

Code availability statement

This manuscript has no associated code/software. [Author’s comment: No relevant code or software was generated during the course of the study.]

Notes

  1. Here, \(|t |_\text {min}\) is the minimum value of \(|t |\).

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Acknowledgements

This work was done with the use of the IHEP (Protvino) Central Linux Cluster. The work is partially supported with the RFBR Grant 20-02-00246.

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Author notes

  1. V. F. Konstantinov: Deceased.

Authors and Affiliations

  1. NRC “Kurchatov Institute”-IHEP, Nauki Sq. 1, Protvino, 142281, Moscow, Russia

    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

  2. MIPT, Institutsky Lane 9, Dolgoprudny, 141701, Moscow, Russia

    Yu. A. Khokhlov & A. M. Zaitsev

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Correspondence to Yu. A. Khokhlov.

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Communicated by Klaus Peters.

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Dorofeev, V.A., Eremeev, D.R., Gotman, V.G. et al. Study of a near-threshold scalar resonance in the \(\omega \phi \) system in pion-Be interaction at momentum of 29 GeV. Eur. Phys. J. A 60, 105 (2024). https://doi.org/10.1140/epja/s10050-024-01307-5

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