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We investigate the squeezed back-to-back correlations (BBC) of $\phi\phi$,caused by the mass modification of the particles in the source medium, in theheavy-ion collisions of Au+Au and d+Au at the Relativistic Heavy Ion Collider(RHIC) energies. The BBC functions are calculated using the modified massesextracted from experimental data and the source space-time distributionsprovided by the viscous hydrodynamic code VISH2+1. Our investigations indicatethat the BBC of $\phi\phi$ may perhaps be observed in the collisions of d+Auand the peripheral collisions of Au+Au at the RHIC. We suggest to measure theBBC experimentally for understanding the mass modifications of the $\phi$ mesonin the collisions.

Squeezed back-to-back correlations of $\phi\phi$ in Au+Au and d+Au collisions at the Relativistic Heavy Ion Collider energies