$$\mathrm {K_S}^{0}$$- and (anti-)$$\Lambda $$-hadron correlations in pp collisions at $${\sqrt{s}} = 13$$ TeV (2021)

Abstract Two-particle Azimuthal correlations are measured with the ALICE apparatus in pp collisions at $$\sqrt{s} = 13$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:mrow> </mml:math> 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 ( $$\mathrm {K_S}^{0}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:msub> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> </mml:msub> </mml:mrow> <mml:mn>0</mml:mn> </mml:msup> </mml:math> ) or baryon ( $$\Lambda $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Λ</mml:mi> </mml:math> ) with transverse momentum $$p_{\mathrm T} &gt;3$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>p</mml:mi> <mml:mi>T</mml:mi> </mml:msub> <mml:mo>&gt;</mml:mo> <mml:mn>3</mml:mn> </mml:mrow> </mml:math> GeV/ $$c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>c</mml:mi> </mml:math> is produced. Azimuthal correlations between kaons or $$\Lambda $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Λ</mml:mi> </mml:math> hyperons with other hadrons are presented at midrapidity for a broad range of the trigger ( $$3&lt; p_\mathrm {T}^\mathrm {trigg} &lt; 20$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>3</mml:mn> <mml:mo>&lt;</mml:mo> <mml:msubsup> <mml:mi>p</mml:mi> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mi>trigg</mml:mi> </mml:msubsup> <mml:mo>&lt;</mml:mo> <mml:mn>20</mml:mn> </mml:mrow> </mml:math> GeV/ $$c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>c</mml:mi> </mml:math> ) and associated particle $$p_{\mathrm T}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mi>T</mml:mi> </mml:msub> </mml:math> (1 GeV/ $$c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>c</mml:mi> </mml:math> $$&lt; p_\mathrm {T}^\mathrm {assoc} &lt; p_\mathrm {T}^\mathrm {trigg} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>&lt;</mml:mo> <mml:msubsup> <mml:mi>p</mml:mi> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mi>assoc</mml:mi> </mml:msubsup> <mml:mo>&lt;</mml:mo> <mml:msubsup> <mml:mi>p</mml:mi> <mml:mrow> <mml:mi>T</mml:mi> </mml:mrow> <mml:mi>trigg</mml:mi> </mml:msubsup> </mml:mrow> </mml:math> ), 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 $$\mathrm {K_S}^{0}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:msub> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> </mml:msub> </mml:mrow> <mml:mn>0</mml:mn> </mml:msup> </mml:math> or $$\Lambda $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Λ</mml:mi> </mml:math> ( $${\overline{\Lambda }}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mi>Λ</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> ) 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.