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

Abstract

Femtoscopic correlations between charged pions and kaons for different charge combinations are measured in Pb–Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76\text{TeV}$ 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_out) and emission asymmetry (μ_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.