Centrality dependent Lévy HBT analysis in $\sqrt{s_{_{\text{NN}}}}=5.02$ TeV PbPb collisions at CMS

The measurement of two-particle Bose–Einstein momentum correlation functions are presented using TeV PbPb collision data, recorded by the CMS experiment in 2018. The measured correlation functions are discussed in terms of Lévy-type source distributions. The Lévy source parameters are extracted as functions of transverse mass and collision centrality. These source parameters include the correlation strength , the Lévy stability index , and the Lévy scale parameter R. The source shape, characterized by , is found to be neither Gaussian nor Cauchy. A hydrodynamic-like scaling of R is also observed.