Two-particle correlations with K 0S , Lambda/anti-Lambda, and charged hadrons as trigger particles in the transverse momentum range 8< pT,trig<16 GeV/c, and associated charged particles within 1< pT,assoc<8 GeV/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 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 ) is computed. The per-trigger yield in Pb–Pb collisions on the away side is strongly suppressed to the level of IAA ≈ 0.6 for pT,assoc > 3 GeV/c as expected from strong in-medium energy loss, while an enhancement develops at low pT,assoc on both the near and away sides, reaching IAA ≈ 1.8 and 2.7respectively. These findings are in good agreement with previous ALICE measurements from two-particle correlations triggered by neutral pions (π0 –h) and charged hadrons (h–h) in Pb–Pb collisions at √sNN = 2.76 TeV. Moreover, the correlations with K 0S mesons and Lambda/anti-Lambda 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 KS0 and Λ (Λ ¯) in pp and central Pb–Pb collisions at √sNN=5.02 TeV

Cortese P.;Ramello L.;Sitta M.;
2023-01-01

Abstract

Two-particle correlations with K 0S , Lambda/anti-Lambda, and charged hadrons as trigger particles in the transverse momentum range 8< pT,trig<16 GeV/c, and associated charged particles within 1< pT,assoc<8 GeV/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 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 ) is computed. The per-trigger yield in Pb–Pb collisions on the away side is strongly suppressed to the level of IAA ≈ 0.6 for pT,assoc > 3 GeV/c as expected from strong in-medium energy loss, while an enhancement develops at low pT,assoc on both the near and away sides, reaching IAA ≈ 1.8 and 2.7respectively. These findings are in good agreement with previous ALICE measurements from two-particle correlations triggered by neutral pions (π0 –h) and charged hadrons (h–h) in Pb–Pb collisions at √sNN = 2.76 TeV. Moreover, the correlations with K 0S mesons and Lambda/anti-Lambda 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/11579/159343
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