Measurement of low-mass e + e − pair production in 1 and 2 A GeV C–C collision with HADES

M. Sudol; G. Agakishiev; C. Agodi; A. Balanda; G. Bellia; D. Belver; A. Belyaev; J. Bielcik; A. Blanco; A. Bortolotti; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; S. Chernenko; T. Christ; R. Coniglione; M. Destefanis; J. Díaz; F. Dohrmann; I. Durán; A. Dybczak; T. Eberl; L. Fabbietti; O. Fateev; R. Ferreira-Marques; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; A. Gil; C. Gilardi; M. Golubeva; D. González-Díaz; E. Grosse; F. Guber; M. Heilmann; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; K. Kanaki; T. Karavicheva; D. Kirschner; I. Koenig; W. Koenig; B. W. Kolb; R. Kotte; A. Kozuch; A. Krása; F. Křížek; R. Krücken; W. Kühn; A. Kugler; A. Kurepin; J. Lamas-Valverde; S. Lang; J. S. Lange; K. Lapidus; L. Lopes; M. Lorenz; L. Maier; C. Maiolino; A. Mangiarotti; J. Marín; J. Markert; V. Metag; B. Michalska; J. Michel; E. Morinière; J. Mousa; M. Münch; C. Müntz; L. Naumann; R. Novotny; J. Otwinowski; Y. C. Pachmayer; M. Palka; Y. Parpottas; V. Pechenov; O. Pechenova; T. Pérez Cavalcanti; P. Piattelli; J. Pietraszko; V. Pospíšil; W. Przygoda; B. Ramstein; A. Reshetin; M. Roy-Stephan; A. Rustamov; A. Sadovsky; B. Sailer; P. Salabura; P. Sapienza; A. Schmah; C. Schroeder; E. Schwab; R. Simon; Yu. G. Sobolev; S. Spataro; B. Spruck; H. Ströbele; J. Stroth; C. Sturm; A. Tarantola; K. Teilab; P. Tlustý; M. Traxler; R. Trebacz; H. Tsertos; V. Wagner; M. Weber; M. Wisniowski; T. Wojcik; J. Wüstenfeld; S. Yurevich; Y. Zanevsky; P. Zhou; P. Zumbruch

doi:10.1140/epjc/s10052-009-1006-2

2021 Impact factor 4.991

Particles and Fields

Open Access

Eur. Phys. J. C (2009) 62: 81-84
https://doi.org/10.1140/epjc/s10052-009-1006-2

Regular Article - Experimental Physics

Measurement of low-mass e ⁺ e ⁻ pair production in 1 and 2 A GeV C–C collision with HADES

M. Sudol¹^*, G. Agakishiev², C. Agodi³, A. Balanda⁴, G. Bellia³, D. Belver⁵, A. Belyaev⁶, J. Bielcik⁷, A. Blanco⁸, A. Bortolotti⁹, J. L. Boyard¹, P. Braun-Munzinger⁷, P. Cabanelas⁵, S. Chernenko⁶, T. Christ¹⁰, R. Coniglione³, M. Destefanis², J. Díaz¹¹, F. Dohrmann¹², I. Durán⁵, A. Dybczak⁴, T. Eberl¹⁰, L. Fabbietti¹⁰, O. Fateev⁶, R. Ferreira-Marques⁸, P. Finocchiaro³, P. Fonte⁸, J. Friese¹⁰, I. Fröhlich¹³, T. Galatyuk⁷, J. A. Garzón⁵, R. Gernhäuser¹⁰, A. Gil¹¹, C. Gilardi², M. Golubeva¹⁴, D. González-Díaz⁷, E. Grosse¹², F. Guber¹⁴, M. Heilmann¹³, T. Heinz⁷, T. Hennino¹, R. Holzmann⁷, A. Ierusalimov⁶, I. Iori⁹, A. Ivashkin¹⁴, M. Jurkovic¹⁰, B. Kämpfer¹², K. Kanaki¹², T. Karavicheva¹⁴, D. Kirschner², I. Koenig⁷, W. Koenig⁷, B. W. Kolb⁷, R. Kotte¹², A. Kozuch⁴, A. Krása¹⁵, F. Křížek¹⁵, R. Krücken¹⁰, W. Kühn², A. Kugler¹⁵, A. Kurepin¹⁴, J. Lamas-Valverde⁵, S. Lang⁷, J. S. Lange², K. Lapidus¹⁴, L. Lopes⁸, M. Lorenz¹³, L. Maier¹⁰, C. Maiolino³, A. Mangiarotti⁸, J. Marín⁵, J. Markert¹³, V. Metag², B. Michalska⁹, J. Michel¹³, E. Morinière¹, J. Mousa¹⁶, M. Münch⁷, C. Müntz¹³, L. Naumann¹², R. Novotny², J. Otwinowski⁴, Y. C. Pachmayer¹³, M. Palka⁷, Y. Parpottas¹⁶, V. Pechenov², O. Pechenova², T. Pérez Cavalcanti², P. Piattelli³, J. Pietraszko⁷, V. Pospíšil¹⁵, W. Przygoda⁴, B. Ramstein¹, A. Reshetin¹⁴, M. Roy-Stephan¹, A. Rustamov⁷, A. Sadovsky¹⁴, B. Sailer¹⁰, P. Salabura⁴, P. Sapienza³, A. Schmah¹⁰, C. Schroeder⁷, E. Schwab⁷, R. Simon⁷, Yu. G. Sobolev¹⁵, S. Spataro², B. Spruck², H. Ströbele¹³, J. Stroth¹³^,7, C. Sturm¹³, A. Tarantola¹³, K. Teilab¹³, P. Tlustý¹⁵, M. Traxler⁷, R. Trebacz⁴, H. Tsertos¹⁶, V. Wagner¹⁵, M. Weber¹⁰, M. Wisniowski⁴, T. Wojcik⁴, J. Wüstenfeld¹², S. Yurevich⁷, Y. Zanevsky⁶, P. Zhou¹² and P. Zumbruch⁷

¹ Institut de Physique Nucléaire (UMR 8608), CNRS/IN2P3—Université Paris Sud, 91406, Orsay Cedex, France
² II. Physikalisches Institut, Justus Liebig Universität Giessen, 35392, Giessen, Germany
³ Istituto Nazionale di Fisica Nucleare–Laboratori Nazionali del Sud, 95125, Catania, Italy
⁴ Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059, Kraków, Poland
⁵ Departamento de Física de Partículas, University of Santiago de Compostela, 15782, Santiago de Compostela, Spain
⁶ Joint Institute of Nuclear Research, 141980, Dubna, Russia
⁷ Gesellschaft für Schwerionenforschung mbH, 64291, Darmstadt, Germany
⁸ LIP-Laboratório de Instrumentação e Física Experimental de Partículas, 3004-516, Coimbra, Portugal
⁹ Istituto Nazionale di Fisica Nucleare, Sezione di Milano, 20133, Milano, Italy
¹⁰ Physik Department E12, Technische Universität München, 85748, Munich, Germany
¹¹ Instituto de Física Corpuscular, Universidad de Valencia-CSIC, 46971, Valencia, Spain
¹² Institut für Strahlenphysik, Forschungszentrum Dresden-Rossendorf, 01314, Dresden, Germany
¹³ Institut für Kernphysik, Johann Wolfgang Goethe-Universität, 60438, Frankfurt, Germany
¹⁴ Institute for Nuclear Research, Russian Academy of Science, 117312, Moscow, Russia
¹⁵ Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068, Rez, Czech Republic
¹⁶ Department of Physics, University of Cyprus, 1678, Nicosia, Cyprus

^* e-mail: sudol@ipno.in2p3.fr

Received: 30 September 2008
Revised: 8 February 2009
Published online: 8 April 2009

Abstract

HADES is a secondary generation experiment operated at GSI Darmstadt with the main goal to study dielectron production in proton, pion and heavy ion induced reactions. The first part of the HADES mission is to reinvestigate the puzzling pair excess measured by the DLS collaboration in C + C and Ca + Ca collisions at 1 A GeV. For this purpose dedicated measurements with the C + C system at 1 and 2 A GeV were performed. The pair excess above a cocktail of free hadronic decays has been extracted and compared to the one measured by DLS. Furthermore, the excess is confronted with predictions of various model calculations.

PACS: 25.75.-q – / 25.75.Dw – / 13.40.Hq –

© Springer-Verlag , 2009

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Measurement of low-mass e + e − pair production in 1 and 2 A GeV C–C collision with HADES

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Measurement of low-mass e ⁺ e ⁻ pair production in 1 and 2 A GeV C–C collision with HADES