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We study the $\Upsilon(1S)$ radiative decays to $\gamma \pi^+ \pi^-$ and$\gamma K^+ K^-$ using data recorded with the BaBar detector operating at theSLAC PEP-II asymmetric-energy $e^+e^-$ collider at center-of-mass energies atthe $\Upsilon(2S)$ and $\Upsilon(3S)$ resonances. The $\Upsilon(1S)$ resonanceis reconstructed from the decay $\Upsilon(nS)\to \pi^+ \pi^- \Upsilon(1S)$,$n=2,3$. We also study the processes $\gamma \gamma \to \eta_c \to\eta^{\prime}K^+K^-$, $\eta^{\prime}\pi^+\pi^-$, and $\eta \pi^+ \pi^-$ using adata sample of 519 $fb^{-1}$ recorded with the BaBar detector at center-of-massenergies at and near the $\Upsilon(nS)$ ($n = 2,3,4$) resonances. A Dalitz plotanalysis is performed of $\eta_c$ decays to $\eta^{\prime}K^+K^-$,$\eta^{\prime}\pi^+\pi^-$, and $\eta \pi^+ \pi^-$. A new $a_0(1700)$ resonanceis observed in the $\eta \pi^{\pm}$ invariant-mass spectrum from the $\eta_c\to \eta \pi^+ \pi^-$ decay. We compare $\eta_c$ decays to $\eta$ and$\eta^{\prime}$ final states in association with scalar mesons as they relateto the identification of the scalar glueball.

Light meson spectroscopy and gluonium searches in $\eta_c$ and $\Upsilon(1S)$ decays at BaBar