| Issue |
EPJ Web Conf.
Volume 137, 2017
XIIth Quark Confinement and the Hadron Spectrum
|
|
|---|---|---|
| Article Number | 05023 | |
| Number of page(s) | 10 | |
| Section | Section B: Light Quarks | |
| DOI | https://doi.org/10.1051/epjconf/201713705023 | |
| Published online | 22 March 2017 | |
https://doi.org/10.1051/epjconf/201713705023
Resonance production and decay in pion induced collisions with HADES
1 TU Darmstadt, Germany
2 IPN Orsay, France
a e-mail: f.scozzi@gsi.de
Published online: 22 March 2017
The main goal of the High Acceptance Di-Electron experiment (HADES) at GSI is the study of hadronic matter in the 1-3.5 GeV/nucleon incident energy range. HADES results on e+ e− production in proton-nucleus reactions and in nucleus-nucleus collisions demonstrate a strong enhancement of the dilepton yield relative to a reference spectrum obtained from elementary nucleon-nucleon reactions. These observations point to a strong modification of the in-medium ρ spectral function driven by the coupling of the ρ to baryon-resonance hole states. However, to scrutinize this conjecture, a precise study of the role of the ρ meson in electromagnetic baryon-resonance transitions in the time-like region is mandatory. In order to perform this study, HADES has started a dedicated pion-nucleon programme. For the first time a combined measurement of hadronic and dielectron final states have been performed in π−-N reactions at four different pion beam momenta (0.656, 0.69, 0.748 and 0.8 GeV/c). First results on exclusive channels with one pion π−-p and two pions (nπ+π−, pπ−π0) in the final state, which are currently analysed within the partial wave analysis (PWA) framework of the Bonn-Gatchina group, are discussed. Finally first results for the dielectron analysis will be shown.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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