Dielectron Continuum Mass Spectra in Heavy Ion Collisions at PHENIX, looking at Centrality and p_T

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Date/Time:Thursday, 05 May 2011 from 4:10 pm to 5:10 pm
Location:A401 Zaffarano Hall
Phone:515-294-6952
Channel:Nuclear Physics
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Sarah Campbell, SUNY Stony Brook

The dielectron mass spectrum consists of light vector meson decays,correlated heavy quark contributions and decays from other hadronic and photonic sources. Light vector mesons, modified by the medium via chiral symmetry restoration, and thermal radiation may provide additional signals at low masses above known hadronic sources. The PHENIX $sqrt{s_{rm NN}}$ = 200 GeV Au+Au and Cu+Cu analyses has measured a centrality dependent excess in the the low mass region ($0.15 GeV/c^{2} < m_{ee} < 0.75 GeV/c^{2}$) over the cocktail of known hadronic sources. Between the phi and the J/psi, the correlated charm contribution is the primary dielectron source; thermal radiation may augment this region as well. In both the low mass region and the intermediate mass region ($1.2 < m_{ee} < 2.87 GeV/c^{2}$), low $p_{T}$ pairs dominate the yields. The study of the mass spectra and yields in $p_{T}$ and centrality bins provides further understanding of the behavior of these various measurements.