Search for a scalar partner of the X(3872) via ψ(3770) decays into γηη′ and γπ+π−J/ψ

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Abstract

Using a data sample corresponding to an integrated luminosity of $2.93\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ 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 $\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\eta}{\ensuremath{\eta}}^{\ensuremath{'}}$ and $\ensuremath{\gamma}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$ processes. No significant signals are observed and the upper limits of the product branching fractions $\mathcal{B}(\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}X(3700))\ifmmode\cdot\else\textperiodcentered\fi{}\mathcal{B}(X(3700)\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\eta}}^{\ensuremath{'}})$ and $\mathcal{B}(\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}X(3700))\ifmmode\cdot\else\textperiodcentered\fi{}\mathcal{B}(X(3700)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi})$ are determined at the 90% confidence level, for the narrow $X(3700)$ with a mass ranging from 3710 to $3740\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, which are from 0.9 to $1.9(\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5})$ and 0.9 to $3.4(\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5})$, respectively.

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