Speaker
Description
Investigation of the femtoscopic correlation functions in heavy ion collisions is an important tool to access the space-time structure of the hadron production of the sQGP. The description of the measured correlation functions is often assumed to be Gaussian or exponential, but a detailed analysis reveals that the statistically correct assumption is a generalized Gaussian, the symmetric alpha-stable Lévy distribution. One of the resulting source parameters, the Lévy stability parameter $\alpha$, describing the shape of the source, may be related to anomalous diffusion in the final state. In this talk we present measurements of two-particle, Bose-Einstein correlation functions in $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV PbPb collisions at CMS. We investigate the centrality and transverse mass dependence of the parameters of the correlation functions: the strength or the intercept parameter $\lambda$, the HBT scale parameter $R$ and the stability parameter $\alpha$.
