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We review the basic concepts and tools to study hadronic properties in the medium. Beginning with a discussion of spontaneous breaking of chiral symmetry of QCD in vacuum and its possible restoration at high temperature/density, we introduce current correlation functions and outline methods of constraining them through sum rules. This is followed by a discussion on the evaluation of the vector meson...
Strangeness production is a key tool to understand the properties of the medium formed in heavy-ion collisions: an enhanced production of strange particles was early proposed as one of the signatures of the Quark-Gluon Plasma. The ϕ meson, due to its ss‾ valence quark content, provides insight into strangeness production.The ALICE experiment has measured ϕ meson production in the dimuon channel in...
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