Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0{ital A} GeV
- Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States)
- University of California at Los Angeles, California 90095 (United States)
- Universite Blaise Pascal/IN2P3, 63177 Aubiere Cedex (France)
- The Johns Hopkins University, Baltimore, Maryland 21218 (United States)
- Louisiana State University, Baton Rouge, Louisiana 70803 (United States)
- Wayne State University, Detroit, Michigan 48201 (United States)
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 dilepton spectrometer (DLS) nucleus-nucleus data. For pair mass M{le}0.35 GeV/c{sup 2} we obtain (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 {pi}{sup 0} and {eta} Dalitz decays, and (3) d{sigma}/dM{proportional_to}A{sub P}A{sub T}. For M{gt}0.5 GeV/c{sup 2} the Ca+Ca to C+C cross section ratio is significantly larger than the ratio of A{sub P}A{sub T} values. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- AC03-76SF00098; FG02-88ER40413; FG03-88ER40424
- OSTI ID:
- 560626
- Journal Information:
- Physical Review Letters, Vol. 79, Issue 7; Other Information: PBD: Aug 1997
- Country of Publication:
- United States
- Language:
- English
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