Kaon Femtoscopy with Lévy-Stable Sources from <inline-formula><math display="inline"><semantics><mrow><msqrt><msub><mi mathvariant="bold-italic">s</mi><msub><mrow/><mi mathvariant="bold">NN</mi></msub></msub></msqrt><mo mathvariant="bold">=</mo><mn mathvariant="bold">200</mn></mrow></semantics></math></inline-formula> GeV <inline-formula><math display="inline"><semantics><mrow><mi mathvariant="bold">Au</mi><mo mathvariant="bold">+</mo><mi mathvariant="bold">Au</mi></mrow></semantics></math></inline-formula> Collisions at RHIC

Femtoscopy has the capacity to probe the space-time geometry of the particle-emitting source in heavy-ion collisions. In particular, femtoscopy of like-sign kaon pairs may shed light on the origin of non-Gaussianity of the spatial emission probability density. The momentum correlations between like-sign kaon pairs are measured in data recorded by the STAR experiment, from <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msqrt><msub><mi>s</mi><msub><mrow></mrow><mi>NN</mi></msub></msub></msqrt><mo>=</mo><mn>200</mn></mrow></semantics></math></inline-formula> GeV <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>Au</mi><mo>+</mo><mi>Au</mi></mrow></semantics></math></inline-formula> collisions at RHIC, BNL. Preliminary results hint at the possible existence of non-Gaussian, Lévy-stable sources, with the likely presence of an anomalous diffusion process in the signal for the identically charged kaon pairs so produced. More statistically significant studies at lower centre-of-mass energies may contribute to the search for the critical end point of QCD.