English

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

Nuclear Experiment 2023-06-22 v2 High Energy Physics - Experiment

Abstract

Two-particle correlations with KS0{\rm K}^{0}_{\rm{S}}, Λ\Lambda/Λˉ\bar{\Lambda}, and charged hadrons as trigger particles in the transverse momentum range 8<pT,trig<168 < p_\mathrm{T,trig}<16 GeV/cc, and associated charged particles within 1<pT,assoc<81 < p_\mathrm{T,assoc}<8 GeV/cc, are studied at mid-rapidity in pp and central Pb-Pb collisions at a centre-of-mass energy per nucleon-nucleon collision sNN=5.02\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 (IAAI_{\mathrm {AA}}) is computed. The per-trigger yield in Pb-Pb collisions on the away side is strongly suppressed to the level of IAA0.6I_{\mathrm {AA}} \approx 0.6 for pT,assoc>3p_\mathrm{T,assoc}>3 GeV/cc as expected from strong in-medium energy loss, while an enhancement develops at low pT,assocp_\mathrm{T,assoc} on both the near and away sides, reaching IAA1.8I_{\mathrm {AA}} \approx 1.8 and 2.72.7 respectively. These findings are in good agreement with previous ALICE measurements from two-particle correlations triggered by neutral pions (π0\pi^{0}-h) and charged hadrons (h-h) in Pb-Pb collisions at sNN=2.76\sqrt{s_{\mathrm{NN}}} = 2.76 TeV. Moreover, the correlations with KS0{\rm K}^{0}_{\rm{S}} mesons and Λ\Lambda/Λˉ\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.

Keywords

Cite

@article{arxiv.2211.01197,
  title  = {Jet-like correlations with respect to K$^{0}_{\rm S}$ and $\Lambda$ ($\bar{\Lambda}$) in pp and central Pb-Pb collisions at $\mathbf{\it\sqrt{s_\mathrm{NN}}}$ = 5.02 TeV},
  author = {ALICE Collaboration},
  journal= {arXiv preprint arXiv:2211.01197},
  year   = {2023}
}

Comments

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