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

The production of strange (K-s(0), A) and multi-strange (Xi(+/-) and Omega(+/-)) hadrons in jets and underlying events in pp and p-Pb collisions is studied with ALICE at the LHC. Transverse momentum (p(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 (Lambda + (Lambda) over bar) /2K(s)(0) and (Xi(-) + (Xi) over bar (+))/(Lambda + (Lambda) over bar) as a function of p(T) are also investigated in jets and underlying events. The production of the multi-strange hadrons, Xi(+/-) and Omega(+/-), and the corresponding ratio in jets and underlying events are measured for the first time. The p(T)-differential density distribution of hadrons associated with hard scattering decreases slower than that for inclusive production. The baryon-tomeson and baryon-to-baryon ratios measured in jets exhibit clear differences from values obtained from the inclusive spectra in the intermediate p(T), range. The p(T), distribution of strange hadrons produced in jets is also studied in pp collisions at root s = 13 TeV and root s = 7 TeV and in p-Pb collisions at root s(NN) = 5.02 TeV. The p(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 (Lambda + (Lambda) over bar) /2K(s)(0) and (Xi(-) + (Xi) over bar (+))/(Lambda + (Lambda) over bar) associated with energetic jets. These new results are compared to PYTHIA 8 event generator. The (Lambda + (Lambda) over bar) /2K(s)(0) ratio are generally reproduced by the model, but large discrepancies between data and PYTHIA simulations are observed for (Xi(-) + (Xi) over bar (+)) /(Lambda + (Lambda) over bar).