Two-particle correlations with K-S(0), Lambda/(Lambda) over bar, and charged hadrons as trigger particles in the transverse momentum range 8<16 GeV/c, and associated charged particles within 1<8 GeV/c, are studied at midrapidity in pp and central Pb-Pb collisions at a centre-of-mass energy per nucleon-nucleon collision root 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 (I-AA) is computed. The per-trigger yield in Pb-Pb collisions on the away side is strongly suppressed to the level of I-AA approximate to 0.6 for p(T,assoc) > 3 GeV/c as expected from strong in-medium energy loss, while an enhancement develops at low p(T), assoc on both the near and away sides, reaching I-AA approximate to 1.8 and 2.7 respectively. These findings are in good agreement with previous ALICE measurements from two-particle correlations triggered by neutral pions (pi(0)-h) and charged hadrons (h-h) in Pb-Pb collisions at root s(NN) = 2.76 TeV. Moreover, the correlations with K-S(0) mesons and Lambda/(Lambda) over bar baryons as trigger particles are compared to those of inclusive charged hadrons. The results are compared with the predictions of Monte Carlo models.

Jet-like correlations with respect to $$\textrm{K}^{0}_\mathrm{{S}}$$ and $$\Lambda $$ ($$\overline{\Lambda }$$) in pp and central Pb–Pb collisions at $$\mathbf {\sqrt{s_\textrm{NN}}} = 5.02$$ TeV

Mastroserio, A.;
2023-01-01

Abstract

Two-particle correlations with K-S(0), Lambda/(Lambda) over bar, and charged hadrons as trigger particles in the transverse momentum range 8<16 GeV/c, and associated charged particles within 1<8 GeV/c, are studied at midrapidity in pp and central Pb-Pb collisions at a centre-of-mass energy per nucleon-nucleon collision root 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 (I-AA) is computed. The per-trigger yield in Pb-Pb collisions on the away side is strongly suppressed to the level of I-AA approximate to 0.6 for p(T,assoc) > 3 GeV/c as expected from strong in-medium energy loss, while an enhancement develops at low p(T), assoc on both the near and away sides, reaching I-AA approximate to 1.8 and 2.7 respectively. These findings are in good agreement with previous ALICE measurements from two-particle correlations triggered by neutral pions (pi(0)-h) and charged hadrons (h-h) in Pb-Pb collisions at root s(NN) = 2.76 TeV. Moreover, the correlations with K-S(0) mesons and Lambda/(Lambda) over bar 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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11369/459713
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