Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0 A GeV
R. J. Porter, S. Beedoe, R. Bossingham, M. Bougteb, W. B. Christie, J. Carroll, W. G. Gong, T. Hallman, L. Heilbronn, H. Z. Huang, G. Igo, P. Kirk, G. Krebs, A. Letessier-Selvon, L. Madansky, F. Manso, H. S. Matis, J. Miller, C. Naudet, M. Prunet, G. Roche, L. S. Schroeder, P. Seidl, Z. F. Wang, R. C. Welsh, W. K. Wilson, A. Yegneswaran
Abstract
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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