Jet-like correlations with respect to KS0 and Λ ((Λ)over-bar) in pp and central Pb-Pb collisions at √sNN=5.02 TeV

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.

Automated summary

Two-particle correlations with K-S(0), Lambda/(Lambda) over bar, and charged hadrons as trigger particles have been studied in pp and central Pb-Pb collisions. The results show strong suppression of the per-trigger yield in Pb-Pb collisions on the away side, while an enhancement is observed at low transverse momentum on both the near and away sides. These findings are consistent with previous measurements and are compared with Monte Carlo models.