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Two recent studies from the BABAR experiment at SLAC on low-energy hadronic final states in  e  +  e  −  annihilations are presented. The first study provides the first-ever measurement of the γ * γ * → η '  transition factor, where γ *  denotes an o-shell photon. The second study provides the first-ever measurements of the  e  +  e  − → π +  π − π 0 π 0 π 0  and π + π − π 0 π 0 η cross sections, including studies of the intermediate resonance states and the corresponding  J /ψ and ψ(2S) branching fractions.

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Measurement of the γ*γ*→ η' transition form factor and of the e+e−→ π+π−π0π0π0 and π+π−π0π0η cross sections by BABAR