Measurements of the observed cross sections for $e^+e^-\to$ exclusive light hadrons containing $π^0π^0$ at $\sqrt s= 3.773$, 3.650 and 3.6648 GeV

By analyzing the data sets of 17.3, 6.5 and 1.0 pb$^{-1}$ taken, respectively, at $\sqrt s= 3.773$, 3.650 and 3.6648 GeV with the BES-II detector at the BEPC collider, we measure the observed cross sections for $e^+e^-\to π^+π^-π^0π^0$, $K^+K^-π^0π^0$, $2(π^+π^-π^0)$, $K^+K^-π^+π^-π^0π^0$ and $3(π^+π^-)π^0π^0$ at the three energy points. Based on these cross sections we set the upper limits on the observed cross sections and the branching fractions for $ψ(3770)$ decay into these final states at 90% C.L..

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