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In high-energy collisions, the spatio-temporal size of the particleproduction region can be measured using the Bose-Einstein correlations ofidentical bosons at low relative momentum. The source radii are typicallyextracted using two-pion correlations, and characterize the system at the laststage of interaction, called kinetic freeze-out. In low-multiplicitycollisions, unlike in high-multiplicity collisions, two-pion correlations aresubstantially altered by background correlations, e.g. mini-jets. Suchcorrelations can be suppressed using three-pion cumulant correlations. Wepresent the first measurements of the size of the system at freeze-outextracted from three-pion cumulant correlations in pp, p-Pb and Pb-Pbcollisions at the LHC with ALICE. At similar multiplicity, the invariant radiiextracted in p-Pb collisions are found to be 5-15% larger than those in pp,while those in Pb-Pb are 35-55% larger than those in p-Pb. Our measurementsdisfavor models which incorporate substantially stronger collective expansionin p-Pb as compared to pp collisions at similar multiplicity.

Freeze-out radii extracted from three-pion cumulants in pp, p-Pb and Pb-Pb collisions at the LHC