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Recent results from HADES on electron pair production in relativistic heavy-ion collisions

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arxiv 0911.2411 v1 pith:2CGSWPHS submitted 2009-11-12 nucl-ex

Recent results from HADES on electron pair production in relativistic heavy-ion collisions

The HADES Collaboration: T. Galatyuk , G. Agakishiev , A. Balanda , D. Belver , A.V. Belyaev , A. Blanco , M. B\"ohmer , J.L. Boyard
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P. Braun-Munzinger P. Cabanelas E. Castro S. Chernenko T. Christ M. Destefanis J. D\'iaz F. Dohrmann A. Dybczak L. Fabbietti O.V. Fateev P. Finocchiaro P. Fonte J. Friese I. Fr\"ohlich J. A. Garz\'on R. Gernh\"auser A. Gil C. Gilardi M. Golubeva D. Gonz\'alez-D\'iaz F. Guber T. Hennino R. Holzmann I. Iori A. Ivashkin M. Jurkovic B. K\"ampfer T. Karavicheva D. Kirschner I. Koenig W. Koenig B.W. Kolb R. Kotte F. Krizek R. Kr\"ucken W. K\"uhn 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. Morini\`ere J. Mousa C. M\"untz 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. Str\"obele 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. W\"ustenfeld S. Yurevich Y.V. Zanevsky P. Zhou
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keywords collisionshadesproductionresultscollaborationelectronheavy-ionpair
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Systematic investigations of dilepton production are performed at the SIS accelerator of GSI with the HADES spectrometer. The goal of this program is a detailed understanding of di-electron emission from hadronic systems at moderate temperatures and densities. New results obtained in HADES experiments focussing on electron pair production in elementary collisions are reported here. They pave the way to a better understanding of the origin of the so-called excess pairs earlier on observed in heavy-ion collisions by the DLS collaboration and lately confirmed in two measurements of the HADES collaboration using C+C and Ar+KCl collisions. Results of these studies are discussed.

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