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

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Abstract

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

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