Resonance production and decay in pion induced collisions with HADES

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F17%3A00539942" target="_blank" >RIV/61389005:_____/17:00539942 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1051/epjconf/201713705023" target="_blank" >http://dx.doi.org/10.1051/epjconf/201713705023</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/epjconf/201713705023" target="_blank" >10.1051/epjconf/201713705023</a>

Result language
angličtina
Original language name
Resonance production and decay in pion induced collisions with HADES
Original language description
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 rho spectral function driven by the coupling of the rho to baryon-resonance hole states. However, to scrutinize this conjecture, a precise study of the role of the rho 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 pi(-) -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 pi(-) -p and two pions (n pi(+) pi(-), p pi(-) pi(0)) 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.
Czech name
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Czech description
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Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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