Quark Matter 2015 - XXV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

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

29 Sept 2015, 16:30

2h

Exhibition space 3 & 4

Board: 0444

Poster Jets and High pT Hadrons Poster Session

Speaker

Alice Zimmermann (Ruprecht-Karls-Universitaet Heidelberg (DE))

Description

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, measurements of strange hadrons in jets may clarify the role of fragmentation processes in the anomalous baryon to meson ratio at intermediate particle $p_{\mathrm{T}}$, that firstly was observed in A-A collisions at RHIC and later confirmed in lead-lead (Pb--Pb) collisions at the LHC. Furthermore also measurements in proton-lead (p--Pb) collisions at the LHC showed this anomaly, but to a lesser extent. In this contribution, measurements are presented of the $p_{\mathrm{T}}$ spectra of $\mathrm{\Lambda }$($\bar{\mathrm{\Lambda }}$) baryons and $K_S^0$ mesons produced in association with charged jets in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV and p--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. The analysis is based on data recorded by ALICE at the LHC, exploiting its excellent particle identification capabilities. The baryon/meson ratios of strange particles associated with jets are studied as a function of the event activity in p-Pb collisions and are restricted to central events in Pb-Pb collisions. A comparison is shown to the ratios obtained for inclusive particle production and for particles stemming from the underlying event as well as to PYTHIA proton-proton (pp) simulations.

Presentation materials

QM15_AZ_final.pdf