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We present the first ever measurements of femtoscopic correlations betweenthe K$^0_{\rm S}$ and K$^{\rm \pm}$ particles. The analysis was performed onthe data from Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV measured by theALICE experiment. The observed femtoscopic correlations are consistent withfinal-state interactions proceeding via the $a_0(980)$ resonance. The extractedkaon source radius and correlation strength parameters for K$^0_{\rm S}$K$^{\rm-}$ are found to be equal within the experimental uncertainties to those forK$^0_{\rm S}$K$^{\rm +}$. Comparing the results of the present study with thosefrom published identical-kaon femtoscopic studies by ALICE, mass and couplingparameters for the $a_0$ resonance are constrained. Our results are alsocompatible with the interpretation of the $a_0$ having a tetraquark structureover that of a diquark.

Measuring K$^0_{\rm S}$K$^{\rm \pm}$ interactions using Pb-Pb collisions at ${\sqrt{s_{\rm NN}}=2.76}$ TeV