Kₛ⁰ - and (anti-) Λ -hadron correlations in pp collisions at √s=13 TeV

Abstract

Two-particle Azimuthal correlations are measured with the ALICE apparatus in pp collisions at √s = 13 TeV to explore strangeness- and multiplicity-related effects in the fragmentation of jets and the transition regime between bulk and hard production, probed with the condition that a strange meson (Kₛ⁰) or baryon (Λ) with transverse momentum Pᴛ > 3 GeV/c is produced. Azimuthal correlations between kaons or Λ hyperons with other hadrons are presented at midrapidity for a broad range of the trigger (3 < Pᴛᵗʳⁱᵍᵍ < 20 GeV/c) and associated particle pT (1 GeV/c < Pᴛᵃˢˢᵒᶜ < Pᴛᵗʳⁱᵍᵍ ), for minimum-bias events and as a function of the event multiplicity. The near- and away-side peak yields are compared for the case of either Kₛ⁰ or Λ (Λ̄) being the trigger particle with that of inclusive hadrons (a sample dominated by pions). In addition, the measurements are compared with predictions from PYTHIA 8 and EPOS LHC event generators.