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The interactions of kaons (K) and antikaons ($\mathrm{\overline{K}}$) withfew nucleons (N) were studied so far using kaonic atom data and measurements ofkaon production and interaction yields in nuclei. Some details of thethree-body KNN and $\mathrm{\overline{K}}$NN dynamics are still not wellunderstood, mainly due to the overlap with multi-nucleon interactions innuclei. An alternative method to probe the dynamics of three-body systems withkaons is to study the final state interaction within triplet of particlesemitted in pp collisions at the Large Hadron Collider, which are free fromeffects due to the presence of bound nucleons. This Letter reports the firstfemtoscopic study of p$-$p$-$K$^+$ and p$-$p$-$K$^-$ correlations measured inhigh-multiplicity pp collisions at $\sqrt{s}$ = 13 TeV by the ALICECollaboration. The analysis shows that the measured p$-$p$-$K$^+$ andp$-$p$-$K$^-$ correlation functions can be interpreted in terms of pairwiseinteractions in the triplets, indicating that the dynamics of such systems isdominated by the two-body interactions without significant contributions fromthree-body effects or bound states.

Study of the p$-$p$-$K$^+$ and p$-$p$-$K$^-$ dynamics using the femtoscopy technique