Study of η(1405)/η(1475) in J/ψ → γKS0KS0π0 decay

Using a sample of (10.09 +/- 0.04) x 109 J/psi decays collected with the BESIII detector, partial wave analyses of the decay J/psi -> gamma(KSKS0)-K-0 pi(0) are performed within the (KSKS0)-K-0 pi(0) invariant mass region below 1.6 GeV/c(2). The covariant tensor amplitude method is used in both mass independent and mass dependent approaches. Both analysis approaches exhibit dominant pseudoscalar and axial vector components, and show good consistency for the other individual components. Furthermore, the mass dependent analysis reveals that the (KSKS0)-K-0 pi(0) invariant mass spectrum for the pseudoscalar component can be well described with two isoscalar resonant states using relativistic Breit-Wigner model, i.e., the eta(1405) with a mass of 1391.7 +/- 0.7(-0.3)(+11.3) MeV/c(2) and a width of 60.8 +/- 1.2(-12.0)(+5.5) MeV, and the eta(1475) with a mass of 1507.6 +/- 1.6(-32.2)(+15.5) MeV/c(2) and a width of 115.8 +/- 2.4(-10.9)(+14.8) MeV. The first and second uncertainties are statistical and systematic, respectively. Alternate models for the pseudoscalar component are also tested, but the description of the -10.9 invariant mass spectrum deteriorates significantly.

Automated summary

Using the BESIII detector, a sample of (10.09 +/- 0.04) x 109 J/psi decays is analyzed in the (KSKS0)-K-0 pi(0) invariant mass region below 1.6 GeV/c(2). The analyses show dominant pseudoscalar and axial vector components, with good consistency for other individual components. The mass dependent analysis reveals the presence of two isoscalar resonant states, namely the eta(1405) and eta(1475), in the pseudoscalar component.