Open Access

Piotr Salabura, Jörn Adamczewski-Musch, Benedict Arnoldi-Meadows, Amel Belounnas, Alexei V. Belyaev, Alberto Blanco, Christoph Blume, Michael Böhmer, S. Borisenko, Lukáš Chlad, Petr Chudoba, Izabela Ciepał, Dominique Dittert, Jörn Dreyer, Waleed Ahmed Mohammed Esmail, Michael Dürr, Laura Fabbietti, Oleg Fateev, Paulo Fonte, Jürgen Friese, Ingo Fröhlich, Jörg Förtsch, Tetyana Galatyuk, Roman Gernhäuser, Oleg Golosov, Marina Golubeva, Robert Greifenhagen, Fedor Guber, Malgorzata Gumberidze, Szymon Harabasz, Roman Hensch, Claudia Höhne, Romain Holzmann, Holger Huck, Alexander P. Ierusalimov, Alexander Ivashkin, Burkhard Kämpfer, Karl-Heinz Kampert, Behruz Kardan, Ilse Koenig, Wolfgang Koenig, Georgy Kornakov, Frédéric Julian Kornas, Roland Kotte, Adam Kozela, Ievgenii Kres, Joanna Kuboś, Andrej Kugler, Pawel Kulessa, Vladimir P. Ladygin, Rafał Tomasz Lalik, Alexei Lebedev, Semen Lebedev, Serguei Linev, Luis Alberto Vieira Lopes, Manuel Lorenz, Gennady Lykasov, Tariq Mahmoud, Akshay Malige, Jochen Markert, Tomasz Matulewicz, Steffen Maurus, Volker Metag, Jan Michel, Sergey Morozov, Christian Müntz, Lothar Naumann, Krzysztof Nowakowski, Jan-Hendrik Otto, Vivek Patel, Christian Pauly, Vladimir Pechenov, Olga Pechenova, Oleg Petukhov, Dennis Pfeifer, Krzysztof Piasecki, Jerzy Pietraszko, Alexandr Prozorov, Witold Przygoda, Krzysztof Pysz, Béatrice Ramstein, Narendra Rathod, Andrey Reshetin, James Lambrecht Ritman, Pablo Rodríguez Ramos, Adrian Rost, Piotr Salabura, Federico Scozzi, Florian Seck, Ilya Selyuzhenkov, I. Shabanov, Udai Singh, Jerzy Smyrski, Simon Spies, Herbert Ströbele, Joachim Stroth, Julia Stumm, Ondřej Svoboda, Melanie Szala, Pavel Tlustý, Michael Traxler, Carina Ungethüm, Oton Vázquez Doce, Vladimir Wagner, Adrian Amatus Weber, Christian Wendisch, Michael Wiebusch, Peter Wintz, Joana Wirth, Alexander Zhilin, Peter W. Zumbruch

• Radiative transition of an excited baryon to a nucleon with emission of a virtual massive photon converting to dielectron pair (Dalitz decays) provides important information about baryon-photon coupling at low q2 in timelike region. A prominent enhancement in the respective electromagnetic transition Form Factors (etFF) at q2 near vector mesons ρ/ω poles has been predicted by various calculations reflecting strong baryon-vector meson couplings. The understanding of these couplings is also of primary importance for the interpretation of the emissivity of QCD matter studied in heavy ion collisions via dilepton emission. Dedicated measurements of baryon Dalitz decays in proton-proton and pion-proton scattering with HADES detector at GSI/FAIR are presented and discussed. The relevance of these studies for the interpretation of results obtained from heavy ion reactions is elucidated on the example of the HADES results.