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arXiv · 2103.09680

Scalar isoscalar mesons and the scalar glueball from radiative $J/ψ$ decays

Andrey V. Sarantsev·Igor Denisenko·Ulrike Thoma·Eberhard Klempt
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Abstract

A coupled-channel analysis of BESIII data on radiative $J/ψ$ decays into $ππ$, $K\bar K$, $ηη$ and $ωϕ$ has been performed. The partial-wave amplitude is constrained by a large number of further data. The analysis finds ten isoscalar scalar mesons. Their masses, widths and decay modes are determined. The scalar mesons are interpreted as mainly SU(3)-singlet and mainly octet states. Octet isoscalar scalar states are observed with significant yields only in the 1500-2100\,MeV mass region. Singlet scalar mesons are produced over a wide mass range but their yield peaks in the same mass region. The peak is interpreted as scalar glueball. Its mass and width are determined to $M=1865$\er25$^{+10}_{-30}$ {\rm MeV} and $Γ= 370$\er$50^{+30}_{-20}$ {\rm MeV}, its yield in radiative $J/ψ$ decays to ($5.8\pm 1.0)\,10^{-3}$.

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Andrey V. Sarantsev, Igor Denisenko, Ulrike Thoma, Eberhard Klempt. 2021-03-25. Scalar isoscalar mesons and the scalar glueball from radiative $J/ψ$ decays. https://doi.org/10.1016/j.physletb.2021.136227

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