Enhancement of the dielectron continuum in sqrt{s_NN} = 200 GeV Au+Au collisions

Details Enhancement of the dielectron continuum in sqrt{s_NN} = 200 GeV Au+Au collisions Enhancement of the dielectron continuum in sqrt{s_NN} = 200 GeV Au+Au collisions

2007-06-20

arxiv.org/abs/0706.3034v1

Physics

Nuclear Physics

Nuclear Experiment

344 authors from 52 institutions, 7 pages, 4 figures. Submitted to Physical Review Letters. Plain text data tables for the poi

Scientific paper

The PHENIX experiment has measured the dielectron continuum in sqrt{s_NN} = 200 GeV Au+Au collisions. In minimum bias collisions the dielectron yield in the mass range between 150 and 750 MeV/c^2 is enhanced by a factor of 3.4 +/- 0.2(stat.) +/- 1.3(syst.) +/- 0.7(model) compared to the expectation from our model of hadron decays. The integrated yield increases faster with the centrality of the collisions than the number of participating nucleons, suggesting emission from scattering processes in the hot and dense medium. The continuum yield between the masses of the phi and the J/psi mesons is consistent with expectations from correlated c-cbar production, though other mechanisms are not ruled out.

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