| Issue |
EPJ Web of Conferences
Volume 66, 2014
INPC 2013 – International Nuclear Physics Conference
|
|
|---|---|---|
| Article Number | 09011 | |
| Number of page(s) | 4 | |
| Section | Hadrons in Nuclei | |
| DOI | https://doi.org/10.1051/epjconf/20146609011 | |
| Published online | 20 March 2014 | |
https://doi.org/10.1051/epjconf/20146609011
Low mass dielectrons radiated off cold nuclear matter measured with HADES
1 LIP-Laboratório de Instrumentação e Física Experimental de Partículas , 3004-516 Coimbra, Portugal
2 Smoluchowski Institute of Physics, Jagiellonian University of Cracow, 30-059 Kraków, Poland
3 GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
4 Technische Universität Darmstadt, 64289 Darmstadt, Germany
5 Institut für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
6 Joint Institute of Nuclear Research, 141980 Dubna, Russia
7 Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt, Germany
8 Excellence Cluster ’Origin and Structure of the Universe’ , 85748 Garching, Germany
9 Physik Department E12, Technische Universität München, 85748 Garching, Germany
10 II.Physikalisches Institut, Justus Liebig Universität Giessen, 35392 Giessen, Germany
11 Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia
12 Institute of Theoretical and Experimental Physics, 117218 Moscow, Russia
13 Department of Physics, University of Cyprus, 1678 Nicosia, Cyprus
14 Institut de Physique Nucléaire, CNRS/IN2P3 - Université Paris Sud, F-91406 Orsay Cedex, France
15 Nuclear Physics Institute, Academy of Sciences of Czech Republic, 25068 Rez, Czech Republic
16 LabCAF. F. Física, Univ. de Santiago de Compostela, 15706 Santiago de Compostela, Spain
17 Also at ISEC Coimbra, Coimbra, Portugal
18 Also at ExtreMe Matter Institute EMMI, 64291 Darmstadt, Germany
19 Also at Technische Universität Dresden, 01062 Dresden, Germany
20 Also at Frederick University, 1036 Nicosia, Cyprus
21 Also at Dipartimento di Fisica Generale and INFN, Università di Torino, 10125 Torino, Italy
a e-mail: m.lorenz@gsi.de
Published online: 20 March 2014
The High Acceptance DiElectron Spectrometer HADES [1] is installed at the Helmholtzzentrum für Schwerionenforschung (GSI) accelerator facility in Darmstadt. It investigates dielectron emission and strangeness production in the 1-3 AGeV regime. A recent experiment series focusses on medium-modifications of light vector mesons in cold nuclear matter. In two runs, p+p and p+Nb reactions were investigated at 3.5 GeV beam energy; about 9·109 events have been registered. In contrast to other experiments the high acceptance of the HADES allows for a detailed analysis of electron pairs with low momenta relative to nuclear matter, where modifications of the spectral functions of vector mesons are predicted to be most prominent. Comparing these low momentum electron pairs to the reference measurement in the elementary p+p reaction, we find in fact a strong modification of the spectral distribution in the whole vector meson region.
© Owned by the authors, published by EDP Sciences, 2013
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