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

A coupled-channel analysis of BESIII data on radiative J/psi decays into pi pi, K (K) over bar, eta eta and omega phi 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 1500-2100MeV 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 +/- 25(-30)(+10) MeV and Gamma = 370 +/- 50(-20)(+30) MeV, its yield in radiative J/psi decays to (5.8 +/- 1.0) 10(-3). (C) 2021 The Author(s). Published by Elsevier B.V.

Automated summary

A coupled-channel analysis of BESIII data on radiative J/psi decays into pi pi, K (K) over bar, eta eta and omega phi was performed to determine the ten isoscalar scalar mesons. The masses, widths, and decay modes of these mesons were determined and interpreted as mainly SU(3)-singlet and mainly octet states. Octet isoscalar scalar states were observed with significant yields only in the 1500-2100MeV mass region.