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26 April 2024

» pubmed » pmid17358850

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Dielectron production in 12C+12C collisions at 2A GeV with the HADES spectrometer
G Agakichiev ; C Agodi ; H Alvarez-Pol ; A Ba?anda ; D Bertini ; J Bielcik ; G Bellia ; M Böhmer ; H Bokemeyer ; J L Boyard ; P Braun-Munzinger ; P Cabanelas ; S Chernenko ; T Christ ; R Coniglione ; L Cosentino ; J Díaz ; F Dohrmann ; I Durán ; T Eberl ; W Enghardt ; L Fabbietti ; O Fateev ; C Fernandez ; P Finocchiaro ; J Friese ; I Fröhlich ; B Fuentes ; C Garabatos ; J A Garzón ; R Gernhäuser ; C Gilardi ; M Golubeva ; D González-Díaz ; E Grosse ; F Guber ; T Hennino ; S Hlavac ; R Holzmann ; J Homolka ; A Ierusalimov ; I Iori ; A Ivashkin ; M Jasku?a ; M Jurkovic ; M Kagarlis ; M Kajetanowicz ; B Kämpfer ; K Kanaki ; T Karavicheva ; A Kastenmüller ; L Kido? ; P Kienle ; I Koenig ; W Koenig ; H J Körner ; B W Kolb ; R Kotte ; R Krücken ; A Kugler ; W Kühn ; 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 Münch ; C Müntz ; L Naumann ; A Nekhaev ; J Novotny ; J Otwinowski ; Y C Pachmayer ; V Pechenov ; T Pérez ; P Piattelli ; J Pietraszko ; R Pleskac ; M P?osko? ; V Pospísil ; W Prokopowicz ; W Przygoda ; B Ramstein ; A Reshetin ; J Ritman ; M Roy-Stephan ; A Rustamov ; A Sadovsky ; B Sailer ; P Salabura ; M Sánchez ; P Sapienza ; A Schmah ; H Schön ; W Schön ; C Schröder ; E Schwab ; R S Simon ; V Smolyankin ; L Smykov ; S Spataro ; B Spruck ; H Ströbele ; J Stroth ; C Sturm ; M Sudo? ; M Suk ; A Taranenko ; P Tlusty ; A Toia ; M Traxler ; H Tsertos ; D Vassiliev ; A Vázquez ; V Wagner ; W Walu? ; M Wi?niowski ; T Wójcik ; J Wüstenfeld ; Y Zanevsky ; K Zeitelhack ; D Zovinec ; P Zumbruch ; ;
Date:	2 Feb 2007
Journal:	Phys Rev Lett, 98 (5), 052302
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(0)-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi(0) and eta account for all the yield up to 0.15 GeV/c(2), 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.
Source:	PubMed, pmid17358850
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