Thursday, August 23, 2012

1208.4437 (Vlasios Petousis)

Theoretical Review on Vector Mesons in Dileptonic Quark Gluon Plasma    [PDF]

Vlasios Petousis
After the discovery of the Quantum Chromodynamics (QCD), many experimental and theoretical efforts have been made to investigate physics issues involved in ultra relativistic heavy-ion collisions. The fundamental goal of this work is to present the underlying theory of strong interactions with emphasis on the light vector mesons and the signals of chiral symmetry restoration. Today widely believed that chiral symmetry restoration probably takes place in a hot and dense hadronic medium as this produced at these collisions. We focus at the place where the examination of the new form of matter, so-called Quark Gluon Plasma (QGP), can be done through the investigation of the dileptonic production coming from light vector mesons. In that type of new matter, in general one can say that what it follows from chiral symmetry restoration is that the parity partners of hadronic correlation functions must become identical. The evaluation of medium effects in the vector channel, which governs the dilepton production necessitates a simultaneous treatment of the vector and pseudo-vector (axial-vector) degrees of freedom. Significant progress has been made since the last years, but still some open questions remain to establishing a helpful link with the non perturbative mass region.
View original: http://arxiv.org/abs/1208.4437

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