Pion-kaon femtoscopy in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV measured with ALICE

Abstract

Femtoscopic correlations between charged pions and kaons for different charge combinations are measured in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV with ALICE at the LHC. The three-dimensional pion-kaon ($\pi -\mathrm{K}$) correlation functions and double ratios in the out-side-long pair rest frame are studied in different centrality bins. The $\pi -\mathrm{K}$ femtoscopic source size parameter ($R_{\mathrm{out}}$) and emission asymmetry (${\mu }_{\mathrm{out}}$) are extracted. It is observed that the average source size of the system and the emission asymmetry between pions and kaons increase from peripheral to central events.

4 pages, 4 figures, Proceedings of XXVIIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2018)