Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0 A GeV

Details Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0 A GeV Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0 A GeV

1997-02-28

arxiv.org/abs/nucl-ex/9703001v2

Phys.Rev.Lett. 79 (1997) 1229-1232

Physics

Nuclear Physics

Nuclear Experiment

Submitted to Physical Review Letters. Further analysis information will be posted on our web pages -- http://macdls.lbl.gov Fi

Scientific paper

10.1103/PhysRevLett.79.1229

We present measured dielectron production cross sections for Ca+Ca, C+C, He+Ca, and d+Ca reactions at 1.0 A GeV. Statistical uncertainties and systematic effects are smaller than in previous DLS nucleus-nucleus data. For pair mass < 0.35 GeV/c2 : 1) the Ca+Ca cross section is larger than the previous DLS measurement and current model results, 2) the mass spectra suggest large contributions from pi0 and eta Dalitz decays, and 3) dsigma/dM is proportional to ApAt. For M > 0.5 GeV/c2 the Ca+Ca to C+C cross section ratio is significantly larger than the ratio of ApAt values.

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