| Autor: |
Dorofeev, V. A., Eremeev, D. R., Gotman, V. G., Ivashin, A. V., Kachaev, I. A., Khokhlov, Yu. A., Kholodenko, M. S., Konstantinov, V. F., Lisin, V. I., Matveev, V. D., Nazarov, E. V., Nikolaenko, V. I., Plekhanov, A. N., Ryabchikov, D. I., Shumakov, A. A., Sugonyaev, V. P., Zaitsev, A. M. |
| Zdroj: |
European Physical Journal A -- Hadrons & Nuclei; May2024, Vol. 60 Issue 5, p1-15, 15p |
| Abstrakt: |
The charge-exchange reaction π - Be → A ω (782) ϕ (1020) with ω → π + π - π 0 and ϕ → K + K - is studied with the upgraded VES facility (U-70, Protvino) using a 29 GeV pion beam. The distribution of the ω ϕ 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 B r (f 0 → π π) B r (f 0 → ω ϕ) is measured. Based on this value, a large partial width is found for the radiative decay of J / ψ 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) . [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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