Using a data sample corresponding to an integrated luminosity of 2.93 fb$^{ -1}$ collected at a center-of-mass energy of 3.773~GeV with the BESIII detector at the BEPCII collider, we search for a scalar partner of the $X(3872)$, denoted as $X(3700)$, via $\psi(3770)\to \gamma\eta\eta'$ and $\gamma\pi^{ +}\pi^{ -}J/\psi$ processes. No significant signals are observed and the upper limits of the product branching fractions $ { \cal B}(\psi(3770)\to\gamma X(3700))\cdot { \cal B}(X(3700)\to \eta\eta')$ and ${ \cal B}(\psi(3770)\to\gamma X(3700))\cdot { \cal B}(X(3700)\to\pi^{ +}\pi^{ -}J/\psi)$ are determined at the 90\% confidence level, for the narrow $X(3700)$ with a mass ranging from 3710 to 3740 MeV/$c^2$, which are from 0.8 to 1.8 $(\times 10^{ -5})$ and 0.9 to 3.4 $(\times 10^{ -5})$, respectively.
Categories: hep-ex
