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K$^{0}_{\rm S}$- and (anti-)$\Lambda$-hadron correlations in pp collisions at $\sqrt{s} = 13$ TeV

The collaboration
CERN-EP-2021-146, 2021.

Abstract (data abstract)
Two-particle azimuthal correlations are measured with the ALICE apparatus in pp collisions at $\sqrt{s} = 13$ 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 ($K_S^0$) or a baryon ($\Lambda$) with transverse momentum $p_{\mathrm{T}}>3$ GeV/$c$ is produced. Azimuthal correlations between kaons or $\Lambda$ hyperons with other hadrons are presented at midrapidity for a broad range of the trigger ($3 < p_{\mathrm{T}}^{\mathrm{trigg}} < 20$ GeV/$c$) and associated particle $p_{\mathrm{T}}$ (1 GeV/$c$ $< p_{\mathrm{T}}^{\mathrm{assoc}} < p_{\mathrm{T}}^{\mathrm{trigg}}$), 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 $K_S^0$ or $\Lambda$($\overline{\Lambda}$) 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.

• #### Figure 1.3

Data from Figure 1, right panel

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Two-dimensional $K_S^0$-h correlation function with $3<p_{\mathrm{T}}^{\mathrm{trigg}}< 4 \mathrm{GeV}/c$ and $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 2.1

Data from Figure 2, top left panel

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$\Delta\varphi$ projection of h-h correlation function with $3<p_{\mathrm{T}}^{\mathrm{trigg}}< 4 \mathrm{GeV}/c$ and $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 2.2

Data from Figure 2, top middle panel

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$\Delta\varphi$ projection of $K_S^0$-h correlation function with $3<p_{\mathrm{T}}^{\mathrm{trigg}}< 4 \mathrm{GeV}/c$ and $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 2.3

Data from Figure 2, top right panel

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$\Delta\varphi$ projection of ($\Lambda+\overline{\Lambda}$)-h correlation function with $3<p_{\mathrm{T}}^{\mathrm{trigg}}< 4 \mathrm{GeV}/c$ and $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 2.4

Data from Figure 2, bottom left panel

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$\Delta\varphi$ projection of h-h correlation function with $9<p_{\mathrm{T}}^{\mathrm{trigg}}< 11 \mathrm{GeV}/c$ and $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 2.5

Data from Figure 2, bottom middle panel

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$\Delta\varphi$ projection of $K_S^0$-h correlation function with $9<p_{\mathrm{T}}^{\mathrm{trigg}}< 11 \mathrm{GeV}/c$ and $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 2.6

Data from Figure 2, bottom right panel

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$\Delta\varphi$ projection of ($\Lambda+\overline{\Lambda}$)-h correlation function with $9<p_{\mathrm{T}}^{\mathrm{trigg}}< 11 \mathrm{GeV}/c$ and $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 3.1

Data from Figure 3, top left panel

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Per-trigger yields of h-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side with $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 3.2

Data from Figure 3, top middle panel

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Per-trigger yields of $K_S^0$-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side with $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 3.3

Data from Figure 3, top right panel

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Per-trigger yields of ($\Lambda+\overline{\Lambda}$)-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side with $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 3.4

Data from Figure 3, bottom left panel

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Per-trigger yields of h-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side with $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 3.5

Data from Figure 3, bottom middle panel

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Per-trigger yields of $K_S^0$-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side with $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 3.6

Data from Figure 3, bottom right panel

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Per-trigger yields of ($\Lambda+\overline{\Lambda}$)-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side with $1 \mathrm{GeV}/c<p_{\mathrm{T}}^{\mathrm{assoc}}< p_{\mathrm{T}}^{\mathrm{trigg}}$

• #### Figure 4.1

Data from Figure 4, top left panel

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Ratio of the per-trigger yields in different multiplicity classes to the corresponding minimum bias yield for h-h correlation functions as...

• #### Figure 4.2

Data from Figure 4, top middle panel

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Ratio of the per-trigger yields in different multiplicity classes to the corresponding minimum bias yield for $K_S^0$-h correlation functions as...

• #### Figure 4.3

Data from Figure 4, top right panel

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Ratio of the per-trigger yields in different multiplicity classes to the corresponding minimum bias yield for ($\Lambda+\overline{\Lambda}$)-h correlation functions as...

• #### Figure 4.4

Data from Figure 4, bottom left panel

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Ratio of the per-trigger yields in different multiplicity classes to the corresponding minimum bias yield for h-h correlation functions as...

• #### Figure 4.5

Data from Figure 4, bottom middle panel

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Ratio of the per-trigger yields in different multiplicity classes to the corresponding minimum bias yield for $K_S^0$-h correlation functions as...

• #### Figure 4.6

Data from Figure 4, bottom right panel

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Ratio of the per-trigger yields in different multiplicity classes to the corresponding minimum bias yield for ($\Lambda+\overline{\Lambda}$)-h correlation functions as...

• #### Figure 5.1

Data from Figure 5, top left panel

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Per-trigger yields of h-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{assoc}}$ on the near-side from minimum bias

• #### Figure 5.2

Data from Figure 5, top middle panel

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Per-trigger yields of $K_S^0$-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{assoc}}$ on the near-side from minimum bias

• #### Figure 5.3

Data from Figure 5, top right panel

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Per-trigger yields of ($\Lambda+\overline{\Lambda}$)-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{assoc}}$ on the near-side from minimum bias

• #### Figure 5.4

Data from Figure 5, bottom left panel

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Per-trigger yields of h-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{assoc}}$ on the away-side from minimum bias

• #### Figure 5.5

Data from Figure 5, bottom middle panel

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Per-trigger yields of $K_S^0$-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{assoc}}$ on the away-side from minimum bias

• #### Figure 5.6

Data from Figure 5, bottom middle panel

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Per-trigger yields of ($\Lambda+\overline{\Lambda}$)-h correlation functions as a function of $p_{\mathrm{T}}^{\mathrm{assoc}}$ on the away-side from minimum bias

• #### Figure 8.1

Data from Figure 8, left, top panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for minimum bias

• #### Figure 8.2

Data from Figure 8, left, second panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 0-1% multiplicity...

• #### Figure 8.3

Data from Figure 8, left, third panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 1-3% multiplicity...

• #### Figure 8.4

Data from Figure 8, left, fourth panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 3-7% multiplicity...

• #### Figure 8.5

Data from Figure 8, left, fifth panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 7-15% multiplicity...

• #### Figure 8.6

Data from Figure 8, left, sixth panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 15-50% multiplicity...

• #### Figure 8.7

Data from Figure 8, left, bottom panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 50-100% multiplicity...

• #### Figure 8.8

Data from Figure 8, left, top panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for minimum bias

• #### Figure 8.9

Data from Figure 8, left, second panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 0-1% multiplicity...

• #### Figure 8.10

Data from Figure 8, left, third panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 1-3% multiplicity...

• #### Figure 8.11

Data from Figure 8, left, fourth panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 3-7% multiplicity...

• #### Figure 8.12

Data from Figure 8, left, fifth panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 7-15% multiplicity...

• #### Figure 8.13

Data from Figure 8, left, sixth panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 15-50% multiplicity...

• #### Figure 8.14

Data from Figure 8, left, bottom panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the near-side for 50-100% multiplicity...

• #### Figure 8.15

Data from Figure 8, right, top panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for minimum bias

• #### Figure 8.16

Data from Figure 8, right, second panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 0-1% multiplicity...

• #### Figure 8.17

Data from Figure 8, right, third panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 1-3% multiplicity...

• #### Figure 8.18

Data from Figure 8, right, fourth panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 3-7% multiplicity...

• #### Figure 8.19

Data from Figure 8, right, fifth panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 7-15% multiplicity...

• #### Figure 8.20

Data from Figure 8, right, sixth panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 15-50% multiplicity...

• #### Figure 8.21

Data from Figure 8, right, bottom panel in the left column

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Ratios of integrated per-trigger yield of $K_S^0$-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 50-100% multiplicity...

• #### Figure 8.22

Data from Figure 8, right, top panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for minimum bias

• #### Figure 8.23

Data from Figure 8, right, second panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 0-1% multiplicity...

• #### Figure 8.24

Data from Figure 8, right, third panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 1-3% multiplicity...

• #### Figure 8.25

Data from Figure 8, right, fourth panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 3-7% multiplicity...

• #### Figure 8.26

Data from Figure 8, right, fifth panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 7-15% multiplicity...

• #### Figure 8.27

Data from Figure 8, right, sixth panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 15-50% multiplicity...

• #### Figure 8.28

Data from Figure 8, right, bottom panel in the right column

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Ratios of integrated per-trigger yield of ($\Lambda+\overline{\Lambda}$)-h to h-h as a function of $p_{\mathrm{T}}^{\mathrm{trigg}}$ on the away-side for 50-100% multiplicity...

• #### Figure 9.1

Data from Figure 9, left, top panel in the left column

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• #### Figure 9.3

Data from Figure 9, left, third panel in the left column

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• #### Figure 9.5

Data from Figure 9, left, fifth panel in the left column

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• #### Figure 9.7

Data from Figure 9, left, bottom panel in the left column

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• #### Figure 9.9

Data from Figure 9, left, second panel in the right column

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• #### Figure 9.11

Data from Figure 9, left, fourth panel in the right column

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• #### Figure 9.13

Data from Figure 9, left, sixth panel in the right column

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• #### Figure 9.15

Data from Figure 9, right, top panel in the left column

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• #### Figure 9.17

Data from Figure 9, right, third panel in the left column

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• #### Figure 9.19

Data from Figure 9, right, fifth panel in the left column

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• #### Figure 9.21

Data from Figure 9, right, bottom panel in the left column

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• #### Figure 9.23

Data from Figure 9, right, second panel in the left column

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• #### Figure 9.25

Data from Figure 9, right, fourth panel in the left column

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• #### Figure 9.27

Data from Figure 9, right, sixth panel in the left column

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