| Abstract: | Using a sample of $(10.09pm0.04) imes10^{9}$ $J/psi$ decays collected with
the BESIII detector, partial wave analyses of the decay $J/psi ogamma
K^{0}_{S} K^{0}_{S}pi^{0}$ are performed within the $K^{0}_{S}
K^{0}_{S}pi^{0}$ invariant mass region below 1.6 ${ extrm{GeV}/c^2}$. 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
$K^{0}_{S} K^{0}_{S}pi^{0}$ invariant mass spectrum for the pseudoscalar
component can be well described with two isoscalar resonant states, ${it
i.e.}$, the $eta(1405)$ with a mass of $1391.7pm0.7_{-0.3}^{+11.3}$
$ extrm{MeV}/c^2$ and a width of $60.8pm1.2_{-12.0}^{+5.5}$ $ extrm{MeV}$,
and the $eta(1475)$ with a mass of $1507.6pm1.6_{-32.2}^{+15.5}$
$ extrm{MeV}/c^2$ and a width of $115.8pm2.4_{-10.9}^{+14.8}$ $ extrm{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 $K^{0}_{S} K^{0}_{S}pi^{0}$ invariant mass spectrum
deteriorates significantly. |
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