Speaker
Domenico Colella
(INFN-Bari)
Description
The main goal of heavy-ion physics is to study the properties of the deconfined state of matter known as the Quark-Gluon Plasma (QGP) created in ultra-relativistic heavy-ion collisions. A systematic study of strangeness production is of fundamental importance for determining the thermal properties of the system created in such collisions. In the central barrel of the ALICE detector, K0s, Λ, Ξ and Ω can be identified reconstructing their weak decay topology. In this talk, the yield and ratios (Λ/K0s and hyperon-to-pion) measured in pp, p-Pb and Pb-Pb collisions will be presented and compared as a function of particle multiplicity. It will be shown that the relative production of strange particles follows a continuous increasing trend from low multiplicity pp to peripheral Pb-Pb collisions, above which a saturation is visible for central Pb-Pb collisions. This increasing trend is similar for pp and p-Pb collisions. Moreover, comparison of strange particle production in pp collisions at two different energies (√s = 7 TeV and 13 TeV) will be used to demonstrate that the observed trend in multiplicity is also energy independent.
