Back-to-back correlations of boson-antiboson pairs for anisotropic expanding sources

TL;DR

This paper investigates back-to-back correlations of boson-antiboson pairs in anisotropic expanding sources from high-energy heavy ion collisions, revealing how these correlations depend on particle momentum and source velocity.

Contribution

It provides a calculation of BBC functions for $\, ext{phi}\, ext{phi}$ and $K^+K^-$ pairs considering anisotropic expansion, highlighting their dependence on momentum and velocity.

Findings

BBC functions increase with particle momentum magnitude.

BBC functions depend on the direction of particle momentum.

Decreasing source velocity affects the BBC differently based on particle momentum orientation.

Abstract

In the hot and dense hadronic sources formed in high energy heavy ion collisions, the particle interactions in medium might lead to a measurable back-to-back correlation (BBC) of boson-antiboson pairs. We calculate the BBC functions of $\phi\,\phi$ and $K^+K^-$ for anisotropic expanding sources. The dependences of the BBC on the particle momentum and source expanding velocity are investigated. The results indicate that the BBC functions increase with the magnitude of particle momentum and exhibit an obvious dependence on the direction of the momentum for the anisotropic sources. As the source expanding velocity decreases, the BBC function decreases when the particle momentum is approximately perpendicular to the source velocity, and the BBC function increases when the particle momentum is approximately parallel to the source velocity.