Production of strange hadrons in jets and underlying events in pp and p-Pb collisions with ALICE

Abstract

The production of strange~($K^0_S$, $Λ$) and multi-strange~($Ξ$ and $Ω$) hadrons in jets and underlying events in \pp and \pPb collisions is studied with ALICE at the LHC. Transverse momentum ($p_\rm{T}$) differential density distribution of particles produced in a jet is compared to that of inclusive particle production and that in underlying events. The particle yield ratios of $Λ/K^0_S$ and $Ξ/Λ$ as a function of $p_\rm{T}$ are also investigated in jets and underlying events.The production of the multi-strange hadrons, $Ξ$ and $Ω$, and the corresponding ratio in jets and underlying events are measured for the first time. The $p_\rm{T}$-differential density distribution of hadrons associated with hard scattering decreases slower than that for inclusive production. The baryon-to-meson and baryon-to-baryon ratios measured in jets exhibit clear differences from values obtained from the inclusive spectra in the intermediate $p_\rm{T}$ range. The $p_\rm{T}$ distribution of strange hadrons produced in jets is also studied in pp collisions at $\sqrt{s}$ = 13 TeV and 7 TeV and in p-Pb collisions at $\sqrt{s_\rm{NN}}$ = 5.02 TeV. The $p_\rm{T}$ spectra of particle produced in jets are independent of collision systems and collision energies.No apparent collision energy and collision system dependence is observed for the particle yield ratios of $Λ/K^0_S$ and $Ξ/Λ$ associated with energetic jets. These new results are compared to PYTHIA 8 event generator. The $Λ/K^0_S$ ratio are generally reproduced by the model, but large discrepancies between data and PYTHIA simulations are observed for $Ξ/Λ$.