Data di Pubblicazione:
2007
Abstract:
We report on a measurement of electron pair production in C-12+C-12 collisions at an incident energy of 2 GeV per nucleon with the HADES spectrometer. The measured pair production probabilities span over five orders of magnitude from the pi(0)-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi(0) and account for all the yield up to 0.15 GeV/c(2), but for only about 50% above this mass. The excess yield is in agreement with the former DLS result if one assumes that it scales with beam energy like pion production. A preliminary analysis of C-12+C-12 collisions at an incident energy of 1 A GeV, measured with the HADES detector, supports this scenario.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
HEAVY-ION COLLISIONS; ENERGIES; PI(0)
Elenco autori:
G Agakishiev; C Agodi; A Balanda; G Bellia; D Belver; A Belyaev; A Blanco; M Boehmer; J L Boyard; P Braun-Munzinger;
P Cabanelas; E Castro; S Chernenko; T Christ; M Destefanis;
J Dıaz; F Dohrmann; A Dybczak; T Eberl; L Fabbietti; O Fateev;
P Finocchiaro; P Fonte; J Friese; I Froehlich; T Galatyuk;
J A Garzon; R Gernhauser; C Gilardi; M Golubeva;
D Gonzalez-Dıaz; E Grosse; F Guber; M Heilmann; T Hennino;
R Holzmann; A Ierusalimov; I Iori; A Ivashkin; M Jurkovic;
B Kaempfer; K Kanaki; T Karavicheva; D Kirschner; I Koenig;
W Koenig; B W Kolb; R Kotte; A Kozuch; F Krizek; R Kruecken;
W Kuehn; A Kugler; A Kurepin; J Lamas-Valverde; S Lang;
J S Lange; L Lopes; L Maier; A Mangiarotti; J Marın; J Markert;
V Metag; B Michalska; D Mishra; E Moriniere; J Mousa; C Muentz;
L Naumann; R Novotny; J Otwinowski; Y C Pachmayer; M Palka;
V Pechenov; O Pechenova; T Perez Cavalcanti; J Pietraszko;
W Przygoda; B Ramstein; A Reshetin; M Roy-Stephan;A Rustamov; A Sadovsky; B Sailer; P Salabura; A Schmah;
R Simon; S Spataro; B Spruck; H Stroebele; J Stroth; C Sturm;
MSudol; A Tarantola; K Teilab; P Tlusty;M Traxler; R Trebacz;
H Tsertos; I Veretenkin; V Wagner; H Wen; M Wisniowski;
TWojcik; J Wuestenfeld; S Yurevich; Y Zanevsky;P Zumbruch
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