Contribution of #pi#"o and #eta# Dalitz decays to the dilepton invariant-mass spectrum in 1 A.GeV heavy-ion collisions

Abstract

The Dalitz-decay contributions of #pi#"0 and #eta# mesons to the di-electron invariant-mass spectrum at 1 A.GeV have been obtained from a systematics of inclusive meson production cross sections measured for the collision systems "1"2C+"n"a"tC and "4"0Ar,"4"0Ca+"n"a"tCa in the bombarding-energy range of 0.8 -2.0 A.GeV. These results are compared with the recently published di-electron mass spectra of the DLS collaboration. Systematic errors and angular-distribution effects are discussed. We conclude that the low-mass part of the DLS data cannot be explained by the Dalitz decays of light neutral mesons only. (orig.)Available from FIZ Karlsruhe / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman