DIELECTRON CROSS-SECTION MEASUREMENTS IN NUCLEUS-NUCLEUS REACTIONS AT1.0A GEV

Citation
Rj. Porter et al., DIELECTRON CROSS-SECTION MEASUREMENTS IN NUCLEUS-NUCLEUS REACTIONS AT1.0A GEV, Physical review letters, 79(7), 1997, pp. 1229-1232
Citations number
29
Categorie Soggetti
Physics
Journal title
ISSN journal
00319007
Volume
79
Issue
7
Year of publication
1997
Pages
1229 - 1232
Database
ISI
SICI code
0031-9007(1997)79:7<1229:DCMINR>2.0.ZU;2-6
Abstract
We present measured dielectron production cross sections for Ca + Ca, C + C, He + Ca, and d + Ca reactions at 1.0 AGeV. Statistical uncertai nties and systematic effects are smaller than in previous dilepton spe ctrometer (DLS) nucleus-nucleus data. For pair mass M less than or equ al to 0.35 GeV/c(2) we obtain (1) the Ca + Ca cross section is larger than the previous DLS measurement and current model results, (2) the m ass spectra suggest large contributions from pi(0) and eta Dalitz deca ys, and (3) d sigma/dM proportional to A(p)A(T). For M > 0.5 GeV/c(2) the Ca + Ca to C + C cross section ratio is significantly larger than the ratio of A(p)A(T) values.