\begin{document}$\varXi _{cc}^ {++}$\end{document} baryons in proton-proton collisions at a centre-of-mass energy of \begin{document}$\sqrt{s}=13\;{\rm{TeV}}$\end{document} is measured in the transverse-momentum range \begin{document}$4 < p_{\rm{T}} <15\;{\rm{GeV}}/c$\end{document} and the rapidity range \begin{document}$2.0 <y <4.5$\end{document}. The data used in this measurement correspond to an integrated luminosity of \begin{document}$1.7\;{\rm{fb}}^{-1}$\end{document}, recorded by the LHCb experiment during 2016. The ratio of the \begin{document}$\varXi _{cc}^ {++}$\end{document} production cross-section times the branching fraction of the \begin{document}$\varXi _{cc}^ {++} \to \varLambda _c^ + K^-\pi^+ \pi^+$\end{document} decay relative to the prompt \begin{document}$\varLambda _c^ + $\end{document} production cross-section is found to be \begin{document}$(2.22\pm 0.27 \pm 0.29)\times 10^{-4}$\end{document}, assuming the central value of the measured \begin{document}$\varXi _{cc}^ {++}$\end{document} lifetime, where the first uncertainty is statistical and the second systematic."> Measurement of <inline-formula><tex-math id="L00">\begin{document}${{\varXi_{cc}^{++}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/ab4d657f-f69d-4a2e-b1cb-6c507a86781f/CPC-2019-0381_L00.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/ab4d657f-f69d-4a2e-b1cb-6c507a86781f/CPC-2019-0381_L00.png"/></alternatives></inline-formula> production in <i>pp</i> collisions at <inline-formula><tex-math id="M1">\begin{document}${\sqrt{ s}=13}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/ab4d657f-f69d-4a2e-b1cb-6c507a86781f/CPC-2019-0381_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/ab4d657f-f69d-4a2e-b1cb-6c507a86781f/CPC-2019-0381_M1.png"/></alternatives></inline-formula> TeV -
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