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25 April 2024

» arxiv » 1103.0876

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Dielectron production in Ar+KCl collisions at 1.76A GeV
G. Agakishiev ; A. Balanda ; D. Belver ; A. Belyaev ; A. Blanco ; M. Böhmer ; J. L. Boyard ; P. Cabanelas ; E. Castro ; S. Chernenko ; T. Christ ; M. Destefanis ; F. Dohrmann ; A. Dybczak ; T. Eberl ; E. Epple ; L. Fabbbietti ; O. Fateev ; P. Finocchiaro ; P. Fonte ; J. Friese ; I. Fröhlich ; T. Galatyuk ; J. A. Garzon ; R. Gernhäuser ; C. Gilardi ; M. Golubeva ; D. Gonzalez-Díaz ; F. Guber ; M. Gumberidze ; T. Heinz ; T. Hennino ; R. Holzmann ; P. Huck ; I. Iori ; A. Ivashkin ; M. Jurkovic ; B. Kämpfer ; K. Kanaki ; T. Karavicheva ; I. Koenig ; W. Koenig ; B. W. Kolb ; R. Kotte ; A. Krasa ; F. Krizek ; R. Krücken ; H. Kuc ; W. Kühn ; A. Kugler ; A. Kurepin ; S. Lang ; J. S. Lange ; K. Lapidus T. Liu ; L. Lopes ; M. Lorenz ; L. Maier ; A. Mangiarotti ; J. Markert ; V. Metag ; B. Michalska ; J. Michel ; E. Moriniere ; J. Mousa ; C. Müntz ; L. Naumann ; J. Otwinowski ; Y. C. Pachmayer ; M. Palka ; V. Pechenov ; O. Pechenova ; J. Pietraszko ; W. Przygoda ; B. Ramstein ; A. Reshetin ; A. Rustamov ; A. Sadovsky ; B. Sailer ; P. Salabura ; A. Schmah ; E. Schwab ; J. Siebenson ; Yu.G. Sobolev ; S. Spataro ; B. Spruck ; H. Ströbele ; J. Stroth ; C. Sturm ; A. Tarantola ; K. Teilab ; P. Tlusty ; M. Traxler ; R. Trebacz ; H. Tsertos ; V. Wagner ; M. Weber ; C. Wendisch ; M. Wisniowski ; J. Wüstenfeld ; S. Yurevich ; Y. Zanevsky ;
Date:	4 Mar 2011
Abstract:	We present results on dielectron production in Ar+KCl collisions at 1.76A GeV. For the first time $omega$ mesons could be reconstructed in a heavy-ion reaction at a bombarding energy which is well below the production threshold in free nucleon-nucleon collisions. The omega multiplicity has been extracted and compared to the yields of other particles, in particular of the phi meson. At intermediate e+e- invariant masses, we find a strong enhancement of the pair yield over a reference spectrum from elementary nucleon-nucleon reactions suggesting the onset of non-trivial effects of the nuclear medium. Transverse-mass spectra and angular distributions have been reconstructed in three invariant mass bins. In the former unexpectedly large slopes are found for high-mass pairs. The latter, in particular the helicity-angle distributions, are largely consistent with expectations for a pair cocktail dominated at intermediate masses by delta Dalitz decays.
Source:	arXiv, 1103.0876
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