Search for the doubly heavy baryon <inline-formula><tex-math id="M1">\begin{document}${\boldsymbol\varXi_{\boldsymbol {bc}}^{\bf +}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2022-0187_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2022-0187_M1.png"/></alternatives></inline-formula> decaying to <inline-formula><tex-math id="M2">\begin{document}${\boldsymbol J/\boldsymbol\psi \boldsymbol\varXi_{\boldsymbol c}^{\bf +}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2022-0187_M2.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="CPC-2022-0187_M2.png"/></alternatives></inline-formula>

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