Production of ${\mathrm{K}}_{\mathrm{S}}^0$, $\Lambda$ ($\bar{\Lambda }$), ${\Xi }^{\pm }$ and ${\Omega }^{\pm }$ in jets and in the underlying event in pp and p$-$Pb collisions

Abstract

The production of strange hadrons (K${}_{\mathrm{S}}^0$, $\Lambda$, ${\Xi }^{\pm }$, and ${\Omega }^{\pm }$), baryon-to-meson ratios ($\Lambda /{\mathrm{K}}_{\mathrm{S}}^0$, $\Xi /{\mathrm{K}}_{\mathrm{S}}^0$, and $\Omega /{\mathrm{K}}_{\mathrm{S}}^0$), and baryon-to-baryon ratios ($\Xi /\Lambda$, $\Omega /\Lambda$, and $\Omega /\Xi$) associated with jets and the underlying event were measured as a function of transverse momentum ($p_{\mathrm{T}}$) in pp collisions at $\sqrt{s}=13$ TeV and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ALICE detector at the LHC. The inclusive production of the same particle species and the corresponding ratios are also reported. The production of multi-strange hadrons, ${\Xi }^{\pm }$ and ${\Omega }^{\pm }$, and their associated particle ratios in jets and in the underlying event are measured for the first time. In both pp and p-Pb collisions, the baryon-to-meson and baryon-to-baryon yield ratios measured in jets differ from the inclusive particle production for low and intermediate hadron $p_{\mathrm{T}}$ (0.6$-$6 GeV/$c$). Ratios measured in the underlying event are in turn similar to those measured for inclusive particle production. In pp collisions, the particle production in jets is compared with PYTHIA 8 predictions with three colour-reconnection implementation modes. None of them fully reproduces the data in the measured hadron $p_{\mathrm{T}}$ region. The maximum deviation is observed for ${\Xi }^{\pm }$ and ${\Omega }^{\pm }$, which reaches a factor of about six. In p-Pb collisions, there is no significant event-multiplicity dependence for particle production in jets, in contrast to what is observed in the underlying event. The presented measurements provide novel constraints on hadronisation and its Monte Carlo description. In particular, they demonstrate that the fragmentation of jets alone is insufficient to describe the strange and multi-strange particle production in hadronic collisions at LHC energies.

arXiv comment35 pages, 16 captioned figures, 6 tables, authors from page 30, published version, figures at http://alice-publications.web.cern.ch/node/8628

References in corpus (22)

• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Successive Combination Jet Algorithm For Hadron Collisions
• Pileup subtraction using jet areas
• The QCD equation of state with dynamical quarks
• Performance of the ALICE Experiment at the CERN LHC
• Hadronization in heavy ion collisions: Recombination and fragmentation of partons
• The ALICE TPC, a large 3-dimensional tracking device with fast readout for ultra-high multiplicity events
• The Catchment Area of Jets
• First Results from Pb+Pb collisions at the LHC
• The QCD phase transition with physical-mass, chiral quarks
• Performance of the ALICE VZERO system
• Alignment of the ALICE Inner Tracking System with cosmic-ray tracks
• String Formation Beyond Leading Colour
• Properties of hot and dense matter from relativistic heavy ion collisions
• Signatures of Quark-Gluon-Plasma formation in high energy heavy-ion collisions: A critical review
• Colour Deconfinement in Nuclear Collisions
• The Monte Carlo Event Generator DPMJET-III
• Effects of Colour Reconnection on Hadron Flavour Observables
• Centrality dependence of charged jet production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Hydrodynamic flow from RHIC to LHC

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