Femtoscopy of identified particles at STAR

TL;DR

This paper reports on femtoscopic measurements of identified particles at STAR, including Lambda-Lambda correlations related to the H-dibaryon, spherical harmonic analysis of pion-kaon correlations, and azimuthal HBT results across various energies.

Contribution

It provides new experimental data and analysis methods for particle correlations, exploring the H-dibaryon and femtoscopic properties in heavy-ion collisions.

Findings

Lambda-Lambda correlation measurements suggest constraints on H-dibaryon existence.

Spherical harmonic decomposition offers detailed insights into pion-kaon correlations.

Azimuthal HBT results across energies reveal collision dynamics.

Abstract

We present new measurements of $\Lambda-\Lambda$ correlations, which are closely related to $H$-dibaryon: a six quark state predicted by Jaffe (1977), in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV from the STAR experiment. Fits to different potential models are discussed and extracted scattering length and effective range are also presented.We also present spherical harmonic decomposition of pion-kaon correlation function for 0-5% centrality in Au+Au collision at $\sqrt{s_{NN}} = 200$ GeV. In addition, we also discuss results from azimuthal HBT for beam energies 7.7-200 GeV.