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S. Acharya, D. AdamováS. C. Zugravel, N. Zurlo

The European Physical Journal C(2023)

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Abstract
AbstractTwo-particle correlations with KS0 K S 0 , Λ Λ /Λ Λ ¯ , and charged hadrons as trigger particles in the transverse momentum range $$8{ 8 < p T , trig < 16 GeV/c c , and associated charged particles within $$1{ 1 < p T , assoc < 8 GeV/c c , are studied at midrapidity in pp and central Pb–Pb collisions at a centre-of-mass energy per nucleon–nucleon collision sNN = 5.02 s NN = 5.02 TeV with the ALICE detector at the LHC. After subtracting the contributions of the flow background, the per-trigger yields are extracted on both the near and away sides, and the ratio in Pb–Pb collisions with respect to pp collisions (IAA I AA ) is computed. The per-trigger yield in Pb–Pb collisions on the away side is strongly suppressed to the level of IAA I AA 0.6 ≈ 0.6 for pT,assoc>3 p T , assoc > 3 GeV/c c as expected from strong in-medium energy loss, while an enhancement develops at low pT,assoc p T , assoc on both the near and away sides, reaching IAA I AA 1.8 ≈ 1.8 and 2.7 respectively. These findings are in good agreement with previous ALICE measurements from two-particle correlations triggered by neutral pions (π0 π 0 –h) and charged hadrons (h–h) in Pb–Pb collisions at sNN = 2.76 s NN = 2.76 TeV. Moreover, the correlations with KS0 K S 0 mesons and Λ Λ /Λ Λ ¯ baryons as trigger particles are compared to those of inclusive charged hadrons. The results are compared with the predictions of Monte Carlo models.
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