Femtoscopy at the LHC

Abstract

Abstract. We discuss the results of femtoscopic correlations performed by various experiments at the Large Hadron Collider and theoretical efforts to interpret them. Twoparticle low relative momentum correlations are used to measure the size of the region emitting particles in nuclear collisions. In pp collisions it is important to test the spatiotemporal characteristics of particle production at small scales. The results are compared to sizes measured in Pb+Pb collisions, as a function of pair momentum and centrality. They are interpreted in the frame of hydrodynamic models and used to test the hypothesis of the collective behavior of matter in such collisions.