Zwalinski, LukaszZou, W.Zormpa, OlgaZorbas, T. G.Zoch, KnutZoccoli, AntonioZimine, N. I.2025-03-222025-03-2220241434-60441434-6052https://doi.org/10.1140/epjc/s10052-024-13243-1Properties of the underlying-event in pp interactions are investigated primarily via the strange hadrons KS0, Λ and Λ¯, as reconstructed using the ATLAS detector at the LHC in minimum-bias pp collision data at s=13 TeV. The hadrons are reconstructed via the identification of the displaced two-particle vertices corresponding to the decay modes, Λ→π-p and Λ¯→π+p¯. These are used in the construction of underlying-event observables in azimuthal regions computed relative to the leading charged-particle jet in the event. None of the hadronisation and underlying-event physics models considered can describe the data over the full kinematic range considered. Events with a leading charged-particle jet in the range of 10<pT≤40 GeV are studied using the number of prompt charged particles in the transverse region. The ratio N(Λ+Λ¯)/N(KS0) as a function of the number of such charged particles varies only slightly over this range. This disagrees with the expectations of some of the considered Monte Carlo models. © 2025 Elsevier B.V., All rights reserved.eninfo:eu-repo/semantics/openAccessCharged ParticlesFighter AircraftGermanium CompoundsMonte Carlo MethodsTellurium CompoundsATLAS DetectorsDecay ModeEvent StudiesHadronizationKinematic RangeMonte Carlo ModelParticle JetsPhysics ModelingPropertyTwo ParticlesHadronsArticle2-s2.0-10501245788910.1140/epjc/s10052-024-13243-1