We derive the formulas for calculating the squeezed back-to-back correlation (SBBC) between a boson and antiboson with nonzero width produced in relativistic heavy-ion collisions. The SBBCs of $D^0$ and $\varphi$ mesons with finite in-medium widths are studied. We find that the finite width can change the pattern of the SBBC function of $D^0{\overline{D}}^0$ with respect to mass. However, the SBBC function of $\varphi \varphi$ is insensitive to the width. In the high-particle-momentum region, the SBBC function of $\varphi \varphi$ increases with particle momentum rapidly and can exceed that of $D^0{\overline{D}}^0$ whether the width is nonzero or not.

• Received 17 April 2019

DOI:https://doi.org/10.1103/PhysRevC.100.014907