e+e- Pairs: a clock and a thermometer of heavy ion collisions

Details e+e- Pairs: a clock and a thermometer of heavy ion collisions e+e- Pairs: a clock and a thermometer of heavy ion collisions

2008-05-01

arxiv.org/abs/0805.0153v1

J.Phys.G35:104037,2008

Physics

Nuclear Physics

Nuclear Experiment

Proceedings of Quark Matter 2008, 8 pages, 7 figures

Scientific paper

10.1088/0954-3899/35/10/104037

Recently, there is growing evidence that a new state of matter is formed in sqrt(s_NN)= 200 GeV Au+Au collisions at RHIC: a strongly coupled Quark Gluon Plasma of partonic degrees of freedom which develops a collective motion. Dilepton spectra are not affected by strong interaction and can therefore probe the whole time evolution of the collision. Thus they may be sensitive to onset of deconfinement, chiral symmetry restoration, as well as the production of thermal photons. The PHENIX experiment measured the production of e+e- pairs in p+p and Au+Au collisions at sqrt(s_NN)= 200 GeV. An enhanced dilepton yield in the mass range 150

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