Squeezing effect on three-dimensional Hanbury Brown-Twiss radii

TL;DR

This study investigates how the squeezing effect from in-medium mass modification influences three-dimensional HBT radii in particle collisions, revealing non-monotonic behaviors and varying impacts across different particle pairs.

Contribution

It provides a detailed analysis of the squeezing effect on HBT radii, highlighting its differential impact on various particle pairs and transverse momentum ranges.

Findings

Squeezing effect increases HBT radii, especially in out and longitudinal directions.

Impact is more significant for D0D0 than for φφ pairs.

The effect varies with transverse pair momentum and particle type.

Abstract

This paper examines the impacts of the squeezing effect caused by the particle's in-medium mass modification on the three-dimensional Hanbury Brown-Twiss (HBT) radii. An analysis is conducted on how the squeezing effect impacts the three-dimensional HBT radii of $\phi\phi$, $D^0$$D^0$, and $K^+$$K^+$. The squeezing effect suppresses the impacts of transverse flow on the transverse source distribution and broadens the space-time rapidity distribution of the particle-emitting source, leading to an increase in the HBT radii, notably in out and longitudinal direction. This phenomenon becomes more significant for higher transverse pair momentum, resulting in a non-monotonic decrease in the HBT radii with increasing transverse pair momentum. The impact of the squeezing effect on the HBT radii is more pronounced for $D^0$$D^0$ than for $\phi\phi$. Furthermore, this effect is also more significant for $\phi$$\phi$ than for $K^+$$K^+$. The findings presented in this paper could offer fresh perspectives on investigating the squeezing effect.