We explore the squeezed back-to-back correlation (SBBC) and investigate how the squeezing effect influences the Hanbury-Brown–Twiss (HBT) interferometry using an expanding Gaussian source with nonzero width. The SBBC and HBT of $D^0$ and $\varphi$ mesons with finite in-medium widths are studied. The expanding flow of the source may enhance the SBBC strength of $D^0{\overline{D}}^0$ and $\varphi \varphi$ in the low momentum region but suppress the SBBC in the larger momentum region. The squeezing effect suppresses the influence of flow on the HBT radii, which is significant for two identical bosons with large pair momentum or with large mass. Due to the squeezing effect, the relationship between the HBT radii and the pair momentum exhibits nonflow behavior for the $D^0{D}^0$ pair. Likewise, nonflow behavior also appears in the HBT radii of $\varphi \varphi$ with large pair momentum. This phenomenon may bring new insights for studying the squeezing effect.

• Received 24 September 2023
• Revised 14 December 2023
• Accepted 5 January 2024

DOI:https://doi.org/10.1103/PhysRevC.109.024902

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Published by the American Physical Society