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Excitation functions for the Gaussian emission source radii difference($R^2_{\text{out}} - R^2_{\text{side}}$) obtained from two-pion interferometrymeasurements in Au+Au ($\sqrt{s_{NN}}= 7.7 - 200$ GeV) and Pb+Pb($\sqrt{s_{NN}}= 2.76$ TeV) collisions, are studied for a broad range ofcollision centralities. The observed non-monotonic excitation functionsvalidate the finite-size scaling patterns expected for the deconfinement phasetransition and the critical end point (CEP), in the temperature vs. baryonchemical potential ($T,\mu_B$) plane of the nuclear matter phase diagram. AFinite-Size Scaling (FSS) analysis of these data indicate a second order phasetransition with the estimates $T^{\text{cep}} \sim 165$~MeV and$\mu_B^{\text{cep}} \sim 95$~MeV for the location of the critical end point.The critical exponents ($\nu \sim 0.66$ and $\gamma \sim 1.2$) extracted viathe same FSS analysis, places the CEP in the 3D Ising model universality class.

Observation of the critical end point in the phase diagram for hot and dense nuclear matter