Dilepton production in pp and CC collisions with HADES

I. Fröhlich; G. Agakishiev; C. Agodi; A. Balanda; G. Bellia; D. Belver; A. Belyaev; A. Blanco; M. Böhmer; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; J. Dıaz; F. Dohrmann; T. Eberl; L. Fabbietti; O. Fateev; P. Finocchiaro; P. J. R. Fonte; J. Friese; T. Galatyuk; J. A. Garzón; R. Gernhäuser; C. Gilardi; M. Golubeva; D. González-Dıaz; E. Grosse; F. Guber; Ch. Hadjivasiliou; M. Heilmann; 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; F. Krizek; R. Krücken; A. Kugler; W. Kühn; A. Kurepin; J. Lamas-Valverde; S. Lang; S. Lange; L. Lopes; A. Mangiarotti; J. Marın; J. Markert; V. Metag; B. Michalska; D. Mishra; E. Moriniere; J. Mousa; C. Müntz; L. Naumann; R. Novotny; J. Otwinowski; Y. C. Pachmayer; M. Palka; V. Pechenov; O. Pechenova; T. Pérez Cavalcanti; J. Pietraszko; W. Przygoda; B. Ramstein; A. Reshetin; M. Roy-Stephan; A. Rustamov; A. Sadovsky; B. Sailer; P. Salabura; A. Schmah; R. Simon; S. Spataro; B. Spruck; H. Ströbele; J. Stroth; C. Sturm; M. Sudol; K. Teilab; P. Tlusty; M. Traxler; R. Trebacz; H. Tsertos; I. Veretenkin; V. Wagner; H. Wen; M. Wisniowski; T. Wojcik; J. Wüstenfeld; Y. Zanevsky; P. Zumbruch

doi:10.1140/epja/i2006-10253-y

2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A (2007) 31: 831-835
https://doi.org/10.1140/epja/i2006-10253-y

QNP 2006

Dilepton production in pp and CC collisions with HADES

I. Fröhlich¹⁰, G. Agakishiev¹¹, C. Agodi¹, A. Balanda⁵, G. Bellia¹^,2, D. Belver¹⁹, A. Belyaev⁹, A. Blanco³, M. Böhmer¹⁵, J. L. Boyard¹⁷, P. Braun-Munzinger⁶, P. Cabanelas¹⁹, E. Castro¹⁹, S. Chernenko⁹, T. Christ¹⁵, M. Destefanis¹¹, J. Dıaz²⁰, F. Dohrmann⁷, T. Eberl¹⁵, L. Fabbietti¹⁵, O. Fateev⁹, P. Finocchiaro¹, P. J. R. Fonte³^,4, J. Friese¹⁵, T. Galatyuk⁶, J. A. Garzón¹⁹, R. Gernhäuser¹⁵, C. Gilardi¹¹, M. Golubeva¹⁴, D. González-Dıaz⁶, E. Grosse⁷^,8, F. Guber¹⁴, Ch. Hadjivasiliou¹⁶, M. Heilmann¹⁰, T. Hennino¹⁷, R. Holzmann⁶, A. Ierusalimov⁹, I. Iori¹²^,13, A. Ivashkin¹⁴, M. Jurkovic¹⁵, B. Kämpfer⁷, K. Kanaki⁷, T. Karavicheva¹⁴, D. Kirschner¹¹, I. Koenig⁶, W. Koenig⁶, B. W. Kolb⁶, R. Kotte⁷, A. Kozuch⁵, F. Krizek¹⁸, R. Krücken¹⁵, A. Kugler¹⁸, W. Kühn¹¹, A. Kurepin¹⁴, J. Lamas-Valverde¹⁹, S. Lang⁶, S. Lange⁶, L. Lopes³, A. Mangiarotti³, J. Marın¹⁹, J. Markert¹⁰, V. Metag¹¹, B. Michalska⁵, D. Mishra¹¹, E. Moriniere¹⁷, J. Mousa¹⁶, C. Müntz¹⁰, L. Naumann⁷, R. Novotny¹¹, J. Otwinowski⁵, Y. C. Pachmayer¹⁰, M. Palka⁵, V. Pechenov¹¹, O. Pechenova¹¹, T. Pérez Cavalcanti¹¹, J. Pietraszko⁶, W. Przygoda⁵, B. Ramstein¹⁷, A. Reshetin¹⁴, M. Roy-Stephan¹⁷, A. Rustamov⁶, A. Sadovsky⁷, B. Sailer¹⁵, P. Salabura⁵, A. Schmah⁶, R. Simon⁶, S. Spataro¹, B. Spruck¹¹, H. Ströbele¹⁰, J. Stroth¹⁰^,6, C. Sturm⁶, M. Sudol¹⁰^,6, K. Teilab¹⁰, P. Tlusty¹⁸, M. Traxler⁶, R. Trebacz⁵, H. Tsertos¹⁶, I. Veretenkin¹⁴, V. Wagner¹⁸, H. Wen¹¹, M. Wisniowski⁵, T. Wojcik⁵, J. Wüstenfeld⁷, Y. Zanevsky⁹ and P. Zumbruch⁶

¹ Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, 95125, Catania, Italy
² Dipartimento di Fisica e Astronomia, Università di Catania, 95125, Catania, Italy
³ Departamento de Fısica da Universidade de Coimbra, LIP, 3004-516, Coimbra, Portugal
⁴ ISEC, Coimbra, Portugal
⁵ Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30059, Cracow, Poland
⁶ Gesellschaft für Schwerionenforschung mbH, 64291, Darmstadt, Germany
⁷ Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, PF 510119, 01314, Dresden, Germany
⁸ Technische Universität Dresden, 01062, Dresden, Germany
⁹ Joint Institute of Nuclear Research, 141980, Dubna, Russia
¹⁰ Institut für Kernphysik, Johann Wolfgang Goethe-Universität, 60486, Frankfurt, Germany
¹¹ II.Physikalisches Institut, Justus Liebig Universität Giessen, 35392, Giessen, Germany
¹² Sezione di Milano, Istituto Nazionale di Fisica Nucleare, 20133, Milano, Italy
¹³ Dipartimento di Fisica, Università di Milano, 20133, Milano, Italy
¹⁴ Institute for Nuclear Research, Russian Academy of Science, 117312, Moscow, Russia
¹⁵ Physik Department E12, Technische Universität München, 85748, Garching, Germany
¹⁶ Department of Physics, University of Cyprus, 1678, Nicosia, Cyprus
¹⁷ Institut de Physique Nucléaire d'Orsay, CNRS/IN2P3, 91406, Orsay Cedex, France
¹⁸ Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068, Rez, Czech Republic
¹⁹ Departamento de Fısica de Partıculas, University of Santiago de Compostela, 15782, Santiago de Compostela, Spain
²⁰ Instituto de Fısica Corpuscular, Universidad de Valencia-CSIC, 46971, Valencia, Spain

Received: 23 November 2006
Accepted: 30 November 2006
Published online: 15 March 2007

Abstract

e ⁺ e ^- production was studied using the High Acceptance DiElectron Spectrometer (HADES). In pp collisions at 2.2GeV kinetic beam energy, the exclusive η production and the Dalitz decay η→γe ⁺ e ^- have been reconstructed. The electromagnetic form factor of the latter decay was found to be in good agreement with the existing theoretical predictions. In addition, an inclusive e ⁺ e ^- invariant-mass spectrum from the ¹²C + ¹²C reaction at 2AGeV is presented and compared with a simplified thermal model.

PACS: 13.25.Jx Decays of other mesons – / 13.40.Hq Electromagnetic decays – / 14.40.Aq π, K, and η mesons – / 25.40.Ve Other reactions above meson production thresholds ( energies > 400MeV) –

© Società Italiana di Fisica and Springer-Verlag, 2007

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Dilepton production in pp and CC collisions with HADES

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