Eur. Phys. J. A (2008)
DOI: 10.1140/epja/i2008-10618-2

Dielectron spectroscopy at 1-2 AGeV with HADES

The HADES Collaboration, S. Spataro^{1, 2}, G. Agakishiev², C. Agodi¹, A. Balanda³, G. Bellia¹, D. Belver⁴, A. Belyaev⁵, A. Blanco⁶, M. Böhmer⁷, J. L. Boyard⁸, P. Braun-Munzinger⁹, P. Cabanelas⁴, E. Castro⁴, S. Chernenko⁵, T. Christ⁷, M. Destefanis², J. Diaz¹⁰, F. Dohrmann¹¹, A. Dybczak³, T. Eberl⁷, L. Fabbietti⁷, O. Fateev⁵, P. Finocchiaro¹, P. Fonte⁶, J. Friese⁷, I. Fröhlich¹², T. Galatyuk⁹, J. A. Garzón⁴, R. Gernhäuser⁷, A. Gil¹⁰, C. Gilardi², M. Golubeva¹³, D. González-Diaz⁹, E. Grosse¹¹, F. Guber¹³, M. Heilmann¹², T. Hennino⁸, R. Holzmann⁹, A. Ierusalimov⁵, I. Iori¹⁴, A. Ivashkin¹³, M. Jurkovic⁷, B. Kämpfer¹¹, K. Kanaki¹¹, T. Karavicheva¹³, D. Kirschner², I. Koenig⁹, W. Koenig⁹, B. W. Kolb⁹, R. Kotte¹¹, A. Kozuch³, A. Krása¹⁵, F. Krizek¹⁵, R. Krücken⁷, W. Kühn², A. Kugler¹⁵, A. Kurepin¹³, J. Lamas-Valverde⁴, S. Lang⁹, J. S. Lange², K. Lapidus¹³, L. Lopes⁶, M. Lorenz¹², L. Maier⁷, A. Mangiarotti⁶, J. Marin⁴, J. Markert¹², V. Metag², J. Micel¹², B. Michalska³, D. Mishra², E. Morinière⁸, J. Mousa¹⁶, C. Müntz¹², L. Naumann¹¹, R. Novotny², J. Otwinowski³, Y. C. Pachmayer¹², M. Palka⁹, Y. Parpottas¹⁶, V. Pechenov², O. Pechenova², T. Pérez Cavalcanti², J. Pietraszko⁹, W. Przygoda³, B. Ramstein⁸, A. Reshetin¹³, M. Roy-Stephan⁸, A. Rustamov⁹, A. Sadovsky¹³, B. Sailer⁷, P. Salabura³, A. Schmah⁹, R. Simon⁹, Yu. G. Sobolev¹⁵, B. Spruck², H. Ströbele¹², J. Stroth^{9, 12}, C. Sturm¹², M. Sudol⁹, A. Tarantola¹², K. Teilab¹², P. Tlusty¹⁵, M. Traxler⁹, R. Trebacz³, H. Tsertos¹⁶, I. Veretenkin¹³, V. Wagner¹⁵, H. Wen², M. Wisniowski³, T. Wojcik³, J. Wüstenfeld¹¹, S. Yurevich⁹, Y. Zanevsky⁵, P. Zhou¹¹ and P. Zumbruch<sup>9

1</sup>  Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Catania, Italy
²  II.Physikalisches Institut, Justus Liebig Universität Giessen, Giessen, Germany
³  Smoluchowski Institute of Physics, Jagiellonian University of Cracow, Kraków, Poland
⁴  Departamento de Fisica de Particulas, University of Santiago de Compostela, Santiago de Compostela, Spain
⁵  Joint Institute of Nuclear Research, Dubna, Russia
⁶  LIP-Laboratório de Instrumentação e Fisica Experimental de Particulas, Coimbra, Portugal
⁷  Physik Department E12, Technische Universität München, München, Germany
⁸  Institut de Physique Nucléaire (UMR 8608), CNRS/IN2P3, Université Paris Sud, Orsay Cedex, France
⁹  Gesellschaft für Schwerionenforschung mbH, Darmstadt, Germany
¹⁰  Instituto de Fisica Corpuscular, Universidad de Valencia-CSIC, Valencia, Spain
¹¹  Institut für Strahlenphysik, Forschungszentrum Dresden-Rossendorf, Dresden, Germany
¹²  Institut für Kernphysik, Johann Wolfgang Goethe-Universität, Frankfurt, Germany
¹³  Institute for Nuclear Research, Russian Academy of Science, Moscow, Russia
¹⁴  Sezione di Milano, Istituto Nazionale di Fisica Nucleare, Milano, Italy
¹⁵  Nuclear Physics Institute, Academy of Sciences of Czech Republic, Rez, Czech Republic
¹⁶  Department of Physics, University of Cyprus, Nicosia, Cyprus

stefano.spataro@exp2.physik.uni-giessen.de

Received 2 April 2008 / Published online 14 July 2008

Abstract

The HADES spectrometer at GSI (Darmstadt) is investigating the e⁺ e^- pair production in p+p, p+A and A+A collisions. In this contribution we would like to highlight the physics motivations and the experiments performed so far, focusing mainly on the first results coming from ¹²C + ¹²C collisions at 1 and 2AGeV, and on preliminary results from p+p/d+p collisions at 1.25AGeV.

PACS
25.75.-q - Relativistic heavy-ion collisions.
13.40.Hq - Electromagnetic decays.
25.75.Dw - Particle and resonance production.

Correspondence: stefano.spataro@exp2.physik.uni-giessen.de

Communicated by T. Hennino

© Società Italiana di Fisica, Springer-Verlag 2008