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

Abstract

Two-particle correlations with ${\mathrm{K}}_{\mathrm{S}}^0$, $\Lambda$/$\bar{\Lambda }$, and charged hadrons as trigger particles in the transverse momentum range $8<p_{\mathrm{T},\mathrm{trig}}<16$ GeV/$c$, and associated charged particles within $1<p_{\mathrm{T},\mathrm{assoc}}<8$ GeV/$c$, are studied at mid-rapidity in pp and central Pb-Pb collisions at a centre-of-mass energy per nucleon-nucleon collision $\sqrt{s_{\mathrm{NN}}}=5.02$ 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 ($I_{\mathrm{AA}}$) is computed. The per-trigger yield in Pb-Pb collisions on the away side is strongly suppressed to the level of $I_{\mathrm{AA}}\approx 0.6$ for $p_{\mathrm{T},\mathrm{assoc}}>3$ GeV/$c$ as expected from strong in-medium energy loss, while an enhancement develops at low $p_{\mathrm{T},\mathrm{assoc}}$ on both the near and away sides, reaching $I_{\mathrm{AA}}\approx 1.8$ 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 $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV. Moreover, the correlations with ${\mathrm{K}}_{\mathrm{S}}^0$ mesons and $\Lambda$/$\bar{\Lambda }$ baryons as trigger particles are compared to those of inclusive charged hadrons. The results are compared with the predictions of Monte Carlo models.

27 pages, 5 captioned figures, 4 tables, authors from page 22, published version, figures at http://alice-publications.web.cern.ch/node/8602

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