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Dielectron cross section measurements in nucleus-nucleus reactions at 1.0 A GeV.

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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http://hal.in2p3.fr/in2p3-00002886
Contributor : Michèle Chadelas <>
Submitted on : Wednesday, September 15, 1999 - 2:59:24 PM
Last modification on : Thursday, February 25, 2021 - 10:58:13 AM

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R.J. Porter, S. Beedoe, R. Bossingham, M. Bougteb, W.B. Christie, et al.. Dielectron cross section measurements in nucleus-nucleus reactions at 1.0 A GeV.. Physical Review Letters, American Physical Society, 1997, 79, pp.1229-1232. ⟨in2p3-00002886⟩

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