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24 April 2024

» arxiv » 0910.5875

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Origin of the low-mass electron pair excess in light nucleus-nucleus collisions
HADES Collaboration ; G. Agakishiev ; A. Balanda ; D. Belver ; A. V. Belyaev ; A. Blanco ; M. Böhmer ; J. L. Boyard ; P. Braun-Munzinger ; P. Cabanelas ; E. Castro ; S. Chernenko ; T. Christ ; M. Destefanis ; J. Díaz ; F. Dohrmann ; A. Dybczak ; L. Fabbietti ; O. V. Fateev ; P. Finocchiaro ; P. Fonte ; J. Friese ; I. Fröhlich ; T. Galatyuk ; J. A. Garzón ; R. Gernhäuser ; A. Gil ; C. Gilardi ; M. Golubeva ; D. González-Díaz ; F. Guber ; T. Hennino ; R. Holzmann ; I. Iori ; A. Ivashkin ; M. Jurkovic ; B. Kämpfer ; T. Karavicheva ; D. Kirschner ; I. Koenig ; W. Koenig ; B. W. Kolb ; R. Kotte ; F. Krizek ; R. Krücken ; 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. Morinière ; J. Mousa ; C. Müntz ; L. Naumann ; J. Otwinowski ; Y. C. Pachmayer ; M. Palka ; Y. Parpottas ; V. Pechenov ; O. Pechenova ; J. Pietraszko ; W. Przygoda ; B. Ramstein ; A. Reshetin ; A. Rustamov ; A. Sadovsky ; P. Salabura ; A. Schmah ; E. Schwab ; Yu.G. Sobolev ; S. Spataro ; B. Spruck ; H. Ströbele ; J. Stroth ; C. Sturm ; M. Sudol ; A. Tarantola ; K. Teilab ; P. Tlusty ; M. Traxler ; R. Trebacz ; H. Tsertos ; V. Wagner ; M. Weber ; M. Wisniowski ; T. Wojcik ; J. Wüstenfeld ; S. Yurevich ; Y. V. Zanevsky ; P. Zhou ;
Date:	30 Oct 2009
Abstract:	We report measurements of electron pair production in elementary p+p and d+p reactions at 1.25 GeV/u with the HADES spectrometer. For the first time, the electron pairs were reconstructed for n+p reactions by detecting the proton spectator from the deuteron breakup. We find that the yield of electron pairs with invariant mass Me+e- > 0.15 GeV/c2 is about an order of magnitude larger in n+p reactions as compared to p+p. A comparison to model calculations demonstrates that the production mechanism is not sufficiently described yet. The electron pair spectra measured in C+C reactions are compatible with a superposition of elementary n+p and p+p collisions, leaving little room for additional electron pair sources in such light collision systems.
Source:	arXiv, 0910.5875
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