Investigating $\Lambda$ baryon production in p-Pb collisions in jets and the underlying event using angular correlations

The ALICE collaboration
Phys.Rev.C 111 (2025) 015201, 2025.

Abstract (data abstract)
First measurements of hadron(h)-$\Lambda$ azimuthal angular correlations in p--Pb collisions at $\sqrt{s_{\text{NN}}}= 5.02$ TeV using the ALICE detector at the LHC are presented. These correlations are used to separate the production of associated $\Lambda$ baryons into three different kinematic regions, namely those produced in the direction of the trigger particle (near-side), those produced in the opposite direction (away-side), and those whose production is uncorrelated with the jet-axis (underlying event). The per-trigger associated $\Lambda$ yields in these regions are extracted, along with the near- and away-side azimuthal peak widths, and the results are studied as a function of associated particle $p_{\text{T}}$ and event multiplicity. Comparisons with the DPMJET event generator and previous measurements of the $\phi(1020)$ meson are also made. The final results indicate that strangeness production in the highest multiplicity p-Pb collisions is enhanced relative to low multiplicity collisions in the jet-like regions, as well as the underlying event. The production of $\Lambda$ relative to charged hadrons is also enhanced in the underlying event when compared to the jet-like regions. Additionally, the results hint that strange quark production in the away-side of the jet is modified by soft interactions with the underlying event.

  • Figure 3 top left

    Figure 3, top left, page 13

    10.17182/hepdata.156383.v1/t1

    Azimuthal distribution of the per-trigger h-$\Lambda$ yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 3 top middle

    Figure 3, top middle, page 13

    10.17182/hepdata.156383.v1/t2

    Azimuthal distribution of the per-trigger h-$\Lambda$ yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 3 top right

    Figure 3, top right, page 13

    10.17182/hepdata.156383.v1/t3

    Azimuthal distribution of the per-trigger h-$\Lambda$ yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 3 bottom left

    Figure 3, bottom left, page 13

    10.17182/hepdata.156383.v1/t4

    Azimuthal distribution of the per-trigger h-h yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 3 bottom middle

    Figure 3, bottom middle, page 13

    10.17182/hepdata.156383.v1/t5

    Azimuthal distribution of the per-trigger h-h yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 3 bottom right

    Figure 3, bottom right, page 13

    10.17182/hepdata.156383.v1/t6

    Azimuthal distribution of the per-trigger h-h yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 4 top left

    Figure 4, top left, page 14

    10.17182/hepdata.156383.v1/t7

    Azimuthal distribution of the per-trigger h-$\Lambda$ yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 4 top middle

    Figure 4, top middle, page 14

    10.17182/hepdata.156383.v1/t8

    Azimuthal distribution of the per-trigger h-$\Lambda$ yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 4 top right

    Figure 4, top right, page 14

    10.17182/hepdata.156383.v1/t9

    Azimuthal distribution of the per-trigger h-$\Lambda$ yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 4 bottom left

    Figure 4, bottom left, page 14

    10.17182/hepdata.156383.v1/t10

    Azimuthal distribution of the per-trigger h-h yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 4 bottom middle

    Figure 4, bottom middle, page 14

    10.17182/hepdata.156383.v1/t11

    Azimuthal distribution of the per-trigger h-h yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 4 bottom right

    Figure 4, bottom right, page 14

    10.17182/hepdata.156383.v1/t12

    Azimuthal distribution of the per-trigger h-h yield with trigger transverse momentum between 4 and 8 GeV/c and associated transverse momentum...

  • Figure 5 left

    Figure 5 left, page 15

    10.17182/hepdata.156383.v1/t13

    The h-$\Lambda$ and h-h per-trigger yields as a function of multiplicity in the near and away side regions for the...

  • Figure 5 right

    Figure 5 right, page 15

    10.17182/hepdata.156383.v1/t14

    The h-$\Lambda$ and h-h per-trigger yields as a function of multiplicity in the near and away side regions for the...

  • Figure 6 left

    Figure 6 left, page 16

    10.17182/hepdata.156383.v1/t15

    The (h-$\Lambda$)/(h-h) yield ratio as a function of multiplicity in the near side, away side and underlying event for the...

  • Figure 6 right

    Figure 6 right, page 16

    10.17182/hepdata.156383.v1/t16

    The (h-$\Lambda$)/(h-h) yield ratio as a function of multiplicity in the near side, away side and underlying event for the...

  • Figure 7 left

    Figure 7 left, page 17

    10.17182/hepdata.156383.v1/t17

    The h-$\Lambda$ and h-h near and away side peak widths as a function of multiplicity for the 4-8 GeV/c trigger...

  • Figure 7 right

    Figure 7 right, page 17

    10.17182/hepdata.156383.v1/t18

    The h-$\Lambda$ and h-h near and away side peak widths as a function of multiplicity for the 4-8 GeV/c trigger...

  • Figure 8 left

    Figure 8 left, page 18

    10.17182/hepdata.156383.v1/t19

    The (h-$\Lambda$)/(h-$\phi$) yield ratio as a function of multiplicity in the near side, away side and underlying event for the...

  • Figure 8 right

    Figure 8 right, page 18

    10.17182/hepdata.156383.v1/t20

    The (h-$\Lambda$)/(h-$\phi$) yield ratio as a function of multiplicity in the near side, away side and underlying event for the...

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