Experimental studies of the $π^+π^-π^+π^-π^0$, $K^+K^-π^+π^-π^0$ and $p\bar pπ^+π^-π^0$ final states produced in $e^+e^-$ annihilation at $\sqrt{s}=$ 3.773 and 3.650 GeV

We report measurements of the observed cross sections for $e^+e^-\toωπ^+π^-$, $ωK^+K^-$, $ωp\bar p$, $K^+K^-ρ^0π^0$, $K^+K^-ρ^+π^-+c.c.$, $K^{*0}K^-π^+π^0+c.c.$, $K^{*+}K^-π^+π^-+c.c.$, $ϕπ^+π^-π^0$ and $Λ\bar Λπ^0$ at $\sqrt s=$ 3.773 and 3.650 GeV. Upper limits (90% C.L.) are given for observed cross sections and for $ψ(3770)$ decay branching fractions for production of these final states. These measurements are made by analyzing the data sets of 17.3 pb$^{-1}$ collected at $\sqrt{s}=3.773$ GeV and 6.5 pb$^{-1}$ collected at $\sqrt{s}=3.650$ GeV with the BES-II detector at the BEPC collider.

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