Abstract
The present status and the future of hadron production characterization in Pb–Pb collisions at LHC by measuring the p T dependence of baryon over meson ratios is presented. The current RHIC and LHC results showing a strong enhancement of the Λ/K S 0 ratio in Pb–Pb collisions with respect to proton-proton collisions at intermediate p T and their interpretation in terms of coalescence processes are discussed. A crucial extension of these studies to heavy flavor hadrons (D, B mesons and Λ c , Λ b baryons) will be enabled by the foreseen reforging of the ALICE Inner Tracking System (ITS). The main performance objectives and technological ingredients of the ITS upgrade are summarized.
Highlights
An enhancement of baryon over meson ratios has been observed in the intermediate transverse momentum region of central heavy-ion collisions at RHIC [1, 2] and at the LHC [3]
These measurements reveal strong hints of the formation of a deconfined state of nuclear matter: the so called Quark Gluon Plasma (QGP). They suggest that parton recombination [4] or coalescence [5] mechanisms represent a major actor, in competition with parton fragmentation processes, in the hadron formation scenario, evidencing a high level of partonic degrees of freedom in the created medium
The RHIC experiments first evidenced an excess of baryon over meson ratios at intermediate pT in heavy-ion collisions with respect to pp collisions, and a strong increase of this effect with the collision centrality [1]
Summary
An enhancement of baryon over meson ratios has been observed in the intermediate transverse momentum (pT) region of central heavy-ion collisions at RHIC [1, 2] and at the LHC [3]. These measurements reveal strong hints of the formation of a deconfined state of nuclear matter: the so called Quark Gluon Plasma (QGP). The current results of ALICE concerning the Λ/KS0 ratio will be reported and compared to the ones extracted at RHIC Their interpretation in terms of the parton recombination/coalescence picture will be discussed. The ingredients of the ITS, in terms of layout-out and silicon detector technologies, foreseen to reach this goals will be presented
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