K0sK± femtoscopy in Pb-Pb collisions at √sNN = 2.76 TeV from the LHC ALICE experiment

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2.76 TeV
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Femtoscopy with the particle pair combinations K$^0_{\rm S}$K$^{\rm \pm}$ is studied for the first time. This method has been applied to Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV by the LHC ALICE experiment. Correlations in the K$^0_{\rm S}$K$^{\rm \pm}$ pairs are produced by final-state interactions which proceed through the a$_{\rm 0}$(980) resonance. It is found that the a$_{\rm 0}$ final-state interaction describes the shape of the measured K$^0_{\rm S}$K$^{\rm \pm}$ correlation functions well. The extracted radius and lambda parameters for K$^0_{\rm S}$K$^{\rm -}$ are found to be equal to those for K$^0_{\rm S}$K$^{\rm +}$ within the errors of the present measurement. Comparing the results of the present study with those from identical-kaon femtoscopic studies by ALICE, mass and coupling parameters for the a$_{\rm 0}$ resonance are constrained.