Femtoscopy measurements of two-kaon combinations in Au+Au collisions at the STAR experiment

Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland

^* e-mail: diana.pawlowska.dokt@pw.edu.pl

Published online: 1 March 2023

Abstract

Abstract. Relativistic heavy-ion collisions can study the properties of nuclear matter in high-energy experiments like the STAR experiment. One of the methods to learn about the properties of the bulk matter is the femtoscopy technique, which relies on information carried by the particles produced during the collisions. The emission source parameters, like space-time characteristics, can be extracted using the technique. High statistics data from RHIC make it possible to study the correlations between strange particles, like charged and neutral kaons. The pair-wise interactions between the identical kaons that form the basis for femtoscopy are quantum statistics and the Coulomb interaction for K^±K^±, and quantum statistics and the final-state interaction (FSI) through the f₀(980)/a₀(980) threshold resonances for K_S⁰K_S⁰. The interactions between non-identical kaons pairs of K_S⁰K^± are essential, as the strong FSI is described only by the a₀(98O) resonance, which could be a four-quark state. These proceedings will present the femtoscopic measurements of strange particles with charged and neutral kaons correlations in Au+Au collisions at the RHIC energy.