Production of strange particles in charged jets in p--Pb and Pb--Pb collisions measured with ALICE at the LHC

TL;DR

This paper investigates strange particle production in charged jets from p--Pb and Pb--Pb collisions at the LHC to understand fragmentation processes and the baryon-to-meson ratio anomalies.

Contribution

It provides new measurements of strange particle spectra in jets for different collision systems and compares these to models and inclusive particle ratios.

Findings

Strange particle spectra vary with event activity and collision system.

Baryon-to-meson ratios in jets differ from inclusive ratios and model predictions.

Results shed light on fragmentation and medium effects in heavy-ion collisions.

Abstract

Studies of jet production can provide information about the properties of the hot and dense strongly interacting matter created in ultra-relativistic heavy-ion collisions. Specifically, measurement of strange particles in jets may clarify the role of fragmentation processes in the anomalous baryon to meson ratio at intermediate particle pT that was observed in PbPb and, to a lesser extent, in pPb collisions. In this contribution, measurements of the pT spectra of Lambda and Antilambda baryons and K0s mesons produced in association with charged jets in PbPb collisions at sqrt(sNN)=2.76 TeV and pPb collisions at sqrt(sNN)=5.02 TeV are presented. The analysis is based on data which was recorded by ALICE at the LHC, exploiting its excellent particle identification capabilities. The baryon meson ratios of the spectra of strange particles associated with jets are studied for different event activities in p-Pb and are restricted to central events in PbPb. A comparison to the ratios obtained for inclusive particles and for particles stemming from the underlying event as well as to PYTHIA simulations is shown.