Study of a near-threshold scalar resonance in the system in pion-Be interaction at momentum of 29 GeV

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

doi:10.1140/epja/s10050-024-01307-5

2024 Impact factor 2.8

Hadrons and Nuclei

Eur. Phys. J. A (2024) 60: 105
https://doi.org/10.1140/epja/s10050-024-01307-5

Regular Article - Experimental Physics

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

V. A. Dorofeev¹, D. R. Eremeev¹, V. G. Gotman¹, A. V. Ivashin¹, I. A. Kachaev¹, Yu. A. Khokhlov¹^,2^f, M. S. Kholodenko¹, V. F. Konstantinov¹, V. I. Lisin¹, V. D. Matveev¹, E. V. Nazarov¹, V. I. Nikolaenko¹, A. N. Plekhanov¹, D. I. Ryabchikov¹, A. A. Shumakov¹, V. P. Sugonyaev¹ and A. M. Zaitsev¹^,2

¹ NRC “Kurchatov Institute”-IHEP, Nauki Sq. 1, Protvino, 142281, Moscow, Russia
² MIPT, Institutsky Lane 9, Dolgoprudny, 141701, Moscow, Russia

^f Yury.Khokhlov@ihep.ru

Received: 5 May 2023
Accepted: 25 March 2024
Published online: 14 May 2024

Abstract

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

V. F. Konstantinov: Deceased.

Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

Conference announcements

Dynamics of Electrons in Atomic and Molecular Nanoclusters
May 21-27, 2025
Erice, Sicily, Italy

Belgian Physical Society Meeting
May 28, 2025
Louvain-la-Neuve, Belgium

5th International Conference on the History of Physics
May 29-31, 2025
Coimbra, Portugal

International Symposium on Nuclei in the Cosmos XVIII (NIC XVIII)
June 15-20, 2025
Girona, Spain

International Conference on Phenomena in Ionized Gases
June 20-27, 2025
Aix-en-Provence, France

15th European Conference on Atoms Molecules and Photons (ECAMP)
June 30 to July 4, 2025
Innsbruck, Austria

111th Italian National Society Congress
September 22-26, 2025
Palermo, Italy

EPJ

Study of a near-threshold scalar resonance in the ωϕ system in pion-Be interaction at momentum of 29 GeV

Conference announcements

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