# Squeezed back-to-back correlations of bosons with nonzero widths in relativistic heavy-ion collisions

## TL;DR

This paper derives formulas for squeezed back-to-back correlations of bosons with nonzero widths in relativistic heavy-ion collisions, analyzing how finite widths affect correlation patterns for different mesons.

## Contribution

It introduces new formulas for SBBC calculations considering nonzero widths and studies their effects on $D^0$ and $$ mesons in heavy-ion collisions.

## Key findings

- Finite width alters the SBBC pattern of $D^0{ar D}^0$.
- SBBC of $$ is insensitive to the width.
- SBBC of $$ increases rapidly with particle momentum.

## Abstract

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 $\phi$ mesons with finite in-medium widths are studied. We find that the finite width can change the pattern of the SBBC function of $D^0{\bar D}^0$ with respect to mass. However, the SBBC function of $\phi\phi$ is insensitive to the width. In the high-particle-momentum region, the SBBC function of $\phi\phi$ increases with particle momentum rapidly and can exceed that of $D^0{\bar D}^0$ whether the width is nonzero or not.