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We investigate the squeezed back-to-back correlations (BBC) of $K^+$$K^-$,caused by the mass modification of the particle in the dense medium formed ind+Au collisions at $\sqrt{s_{NN}}=200$ GeV and Au+Au collisions at$\sqrt{s_{NN}}=62.4$ GeV. Considering some kaons may be not affected by themedium, we further study the BBC functions of $K^+$$K^-$ when parts of allkaons have a mass-shift. Our results indicate that the BBC functions of$K^+$$K^-$ can be observed when only about 10$\%$ of all kaons have amass-shift in d+Au collisions at $\sqrt{s_{NN}}=200$ GeV and the peripheralcollisions of Au+Au at $\sqrt{s_{NN}}=62.4$ GeV. Since the BBC function iscaused by the mass-shift due to the interaction between the particle and themedium, the successful detection of the BBC function indirectly marks that thedense medium has formed in these collision systems. We suggest to measure theBBC function of $K^+$$K^-$ experimentally in d+Au collisions at$\sqrt{s_{NN}}=200$ GeV and peripheral collisions of Au+Au at$\sqrt{s_{NN}}=62.4$ GeV.

Squeezed back-to-back correlations of $K^+$$K^-$ in d+Au collisions at $\sqrt{s_{NN}}=200$ GeV and Au+Au collisions at $\sqrt{s_{NN}}=62.4$ GeV