K$^0_\mathrm{S}$ and $\Lambda(\overline\Lambda)$ two-particle femtoscopic correlations in PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV

TL;DR

This study measures two-particle correlations of strange hadrons in PbPb collisions at 5.02 TeV to explore source sizes and strong interaction parameters, providing insights into quantum statistics and final-state interactions.

Contribution

It presents the first detailed analysis of K$^0_ ext{S}$, $ extLambda$, and $ar extLambda$ correlations at this energy, extracting source sizes and scattering parameters with the CMS detector.

Findings

Source size decreases from 4.6 to 1.6 fm from central to peripheral collisions.

Strong interaction scattering parameters are determined and compared to theoretical models.

Correlations reveal information about quantum statistics and final-state interactions.

Abstract

Two-particle correlations are presented for K$^0_\mathrm{S}$, $\Lambda$, and $\overline\Lambda$ strange hadrons as a function of relative momentum in lead-lead collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The dataset corresponds to an integrated luminosity of 0.607 nb$^{-1}$ and was collected using the CMS detector at the CERN LHC. These correlations are sensitive to quantum statistics and to final-state interactions between the particles. The source size extracted from the K$^0_\mathrm{S}$K$^0_\mathrm{S}$ correlations is found to decrease from 4.6 to 1.6 fm in going from central to peripheral collisions. Strong interaction scattering parameters (i.e., scattering length and effective range) are determined from the $\Lambda$K$^0_\mathrm{S}$ and $\Lambda\Lambda$ (including their charge conjugates) correlations using the Lednick$\'y$-Lyuboshitz model and are compared to theoretical and other experimental results.