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29 March 2024
 
  » pubmed » pmid12906652

 Article overview


Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS
D Adamová ; G Agakichiev ; H Appelshäuser ; V Belaga ; P Braun-Munzinger ; A Cherlin ; S Damjanovi? ; T Dietel ; L Dietrich ; A Drees ; S I Esumi ; K Filimonov ; K Fomenko ; Z Fraenkel ; C Garabatos ; P Glässel ; G Hering ; J Holeczek ; V Kushpil ; B Lenkeit ; A Maas ; A Marín ; J Milosevi? ; A Milov ; D Mi?kowiec ; Yu Panebrattsev ; O Petchenova ; V Petrácek ; A Pfeiffer ; J Rak ; I Ravinovich ; P Rehak ; M Richter ; H Sako ; W Schmitz ; S Sedykh ; W Seipp ; A Sharma ; S Shimansky ; J Slívová ; H J Specht ; J Stachel ; M Sumbera ; H Tilsner ; I Tserruya ; J P Wessels ; T Wienold ; B Windelb ; J P Wurm ; W Xie ; S Yurevich ; V Yurevich ; ;
Date 25 Jul 2003
Journal Phys Rev Lett, 91 (4), 042301
AbstractWe report on first measurements of low-mass electron-positron pairs in Pb-Au collisions at the CERN SPS beam energy of 40 AGeV. The observed pair yield integrated over the range of invariant masses 0.2<m</=1 GeV/c(2) is enhanced over the expectation from neutral meson decays by a factor of 5.9+/-1.5(stat)+/-1.2(syst data)+/-1.8(syst meson decays), somewhat larger than previously observed at the higher energy of 158 AGeV. The results are discussed with reference to model calculations based on pi(+)pi(-)-->e(+)e(-) annihilation with a modified rho propagator. They may be linked to chiral symmetry restoration and support the notion that the in-medium modifications of the rho are more driven by baryon density than by temperature.
Source PubMed, pmid12906652
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