\begin{document}$ K^+ $\end{document}\begin{document}$ K^- $\end{document}, caused by the mass modification of particles in the dense medium formed in d + Au collisions at \begin{document}$ \sqrt{s_{NN}} = 200 $\end{document} GeV and Au + Au collisions at \begin{document}$ \sqrt{s_{NN}} = 62.4 $\end{document} GeV. Considering that some kaons may not be affected by the medium, we further study the BBC functions of \begin{document}$ K^+ $\end{document}\begin{document}$ K^- $\end{document} when parts of all kaons have a mass-shift. Our results indicate that the BBC functions of \begin{document}$ K^+ $\end{document}\begin{document}$ K^- $\end{document} can be observed when only ~10% of all kaons have a mass-shift in d + Au collisions at \begin{document}$ \sqrt{s_{NN}} = 200 $\end{document} GeV and the peripheral collisions of Au + Au at \begin{document}$ \sqrt{s_{NN}} = 62.4 $\end{document} GeV. Since the BBC function is caused by the mass-shift due to the interactions between the particle and the medium, the successful detection of the BBC function indirectly marks that the dense medium has formed in these collision systems. We suggest the experimental measurement of the BBC function of \begin{document}$ K^+ $\end{document}\begin{document}$ K^- $\end{document} in d + Au collisions at \begin{document}$ \sqrt{s_{NN}} = 200 $\end{document} GeV and peripheral collisions of Au + Au at \begin{document}$ \sqrt{s_{NN}} = 62.4 $\end{document} GeV."> Squeezed back-to-back correlations of <i>K</i> <sup>+</sup><i>K</i> <sup>−</sup>in d + Au collisions at <inline-formula><tex-math id="M2">\begin{document}${\sqrt{{s_{NN}}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/529b0ff8-cff0-4149-8e1c-4d7fb30381c4/CPC-2019-0056_M2.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/529b0ff8-cff0-4149-8e1c-4d7fb30381c4/CPC-2019-0056_M2.png"/></alternatives></inline-formula>=200 GeV and Au + Au collisions at <inline-formula><tex-math id="M3">\begin{document}${\sqrt{{s_{NN}}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/529b0ff8-cff0-4149-8e1c-4d7fb30381c4/CPC-2019-0056_M3.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/529b0ff8-cff0-4149-8e1c-4d7fb30381c4/CPC-2019-0056_M3.png"/></alternatives></inline-formula> = 62.4 GeV -
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