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

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 prev...

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Published inarXiv.org
Main Authors Porter, R J, Beedoe, S, Bossingham, R, Bougteb, M, Christie, W B, Carroll, J, Gong, W G, Hallman, T, Heilbronn, L, Huang, H Z, Igo, G, Kirk, P, Krebs, G, Letessier-Selvon, A, Madansky, L, Manso, F, Matis, H S, Miller, J, Naudet, C, Prunet, M, Roche, G, Schroeder, L S, Seidl, P, Wang, Z F, Welsh, R C, Wilson, W K, Yegneswaran, A, Collaboration, DLS
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 04.03.1997
Subjects
Cross-sections
Mass spectra
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.9703001