Detailed measurement of the $e^+ e^-$ pair continuum in $p+p$ and Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and implications for direct photon production - INSPIRE

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Detailed measurement of the $e^+ e^-$ pair continuum in $p+p$ and Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and implications for direct photon production

PHENIX

Collaboration

Dec, 2009

56 pages

Published in:

Phys.Rev.C 81 (2010) 034911

e-Print:

0912.0244 [nucl-ex]

DOI:

10.1103/PhysRevC.81.034911

Experiments:

BNL-RHIC-PHENIX

View in:

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Abstract: (arXiv)

PHENIX has measured the e^+e^- pair continuum in sqrt(s_NN)=200 GeV Au+Au and p+p collisions over a wide range of mass and transverse momenta. The e^+e^- yield is compared to the expectations from hadronic sources, based on PHENIX measurements. In the intermediate mass region, between the masses of the phi and the J/psi meson, the yield is consistent with expectations from correlated c^bar-c production, though other mechanisms are not ruled out. In the low mass region (below the phi) the p+p inclusive mass spectrum is well described by known contributions from light meson decays. In contrast, the Au+Au minimum bias inclusive mass spectrum in this region shows an enhancement by a factor of 4.7+/-0.4(stat)+/-1.5(syst)+/-0.9(model) At low mass (m_ee<0.3 GeV/c^2) and high p_T (1

Note:

422 authors from 59 institutions, 56 pages, 50 figures, and 13 tables. Submitted to Physical Review C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

25.75.Dw
p p: interaction
photon: direct production
photon: yield
meson: decay
electron: pair production
electron positron: yield
charm: pair production
gold
PHENIX

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