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We present the result of the femtoscopic analysis of non-identical charged kaon correlations in Pb-Pb collisions at  s NN = 2.76 TeV obtained in ALICE at the LHC. One-dimensional K + K −  correlation functions were analyzed in three centrality classes and eight transverse momentum ranges. The femtoscopic correlations of K + K −  pairs are the result of Coulomb final-state interactions and formation of  a 0 (980) and  f 0 (980) resonances. The K + K −  correlation function was fit with the R. Lednicky and V. Luboshitz model [1]. For the first time,  f 0 (980) mass and couplings were extracted from the K + K −  correlation functions fit with the constraint on the radii to be close to the corresponding radii from identical charged kaon correlations.

Non-identical charged kaon femtoscopy in Pb—Pb collisions at sNN=2.76TeV by ALICE