Data di Pubblicazione:
2007
Abstract:
The invariant-mass spectrum of e+e- pairs produced in 12C + 12C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the pi°-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi° and
eta account for all the yield up to 0:15 GeV=c2, but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire
mass region.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
25.75.Dw; 13.40.Hq
Elenco autori:
G. Agakichiev; C. Agodi; H. Alvarez-Pol; A. Bałanda; D. Bertini; J. Bielcik; G. Bellia; M. Boehmer; H. Bokemeyer; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; S. Chernenko; T. Christ; R. Coniglione; L. Cosentino; J. Dıaz; F. Dohrmann; I. Duran; T. Eberl; W. Enghardt; L. Fabbietti; O. Fateev; C. Fernandez; P. Finocchiaro; J. Friese; I. Froehlich; B. Fuentes; C. Garabatos; J. A. Garzon; R. Gernhauser;12 C. Gilardi; M. Golubeva; D. Gonzalez-Dıaz; E. Grosse; F. Guber; T. Hennino; S. Hlavac; R. Holzmann; J. Homolka; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jaskuła; M. Jurkovic; M. Kagarlis; M. Kajetanowicz; B. Kaempfer; K. Kanaki; T. Karavicheva; A. Kastenmueller; L. Kidon; P. Kienle; I. Koenig; W. Koenig; H. J. Koerner; B.W. Kolb; R. Kotte; R. Kruecken; A. Kugler; W. Kuehn; R. Kulessa; A. Kurepin; S. Lang; S. Lange; J. Lehnert; E. Lins; D. Magestro; C. Maiolino; A. Malarz; J. Markert; V. Metag; J. Mousa; M. Muench; C. Muentz; L. Naumann; A. Nekhaev; J. Novotny; J. Otwinowski; Y. C. Pachmayer; V. Pechenov; T. Perez; P. Piattelli; J. Pietraszko; R. Pleskac; M. Płoskon; V. Pospısil; W. Prokopowicz; W. Przygoda; B. Ramstein; A. Reshetin; J. Ritman; M. Roy-Stephan; A. Rustamov; A. Sadovsky; B. Sailer; P. Salabura; M. Sanchez; P. Sapienza; A. Schmah; H. Schoen; W. Schoen; C. Schroeder; E. Schwab; R. S. Simon; V. Smolyankin; L. Smykov; S. Spataro; B. Spruck; H. Stroebele; J. Stroth; C. Sturm; M. Sudoł; M. Suk; A. Taranenko; P. Tlusty; A. Toia; M. Traxler; H. Tsertos; D. Vassiliev; A. Vazquez; V. Wagner; W. Walus; M. Wisniowski; T. Wojcik; J. Wuestenfeld; Y. Zanevsky; K. Zeitelhack; D. Zovinec; P. Zumbruch
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