Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 73: Heavy Ion Collisions and QCD Phases 10
HK 73.4: Vortrag
Freitag, 27. März 2015, 15:45–16:00, T/HS2
Angular distributions in π N → N e+ e− — •Enrico Speranza1,2, Bengt Friman1, György Wolf3, and Miklós Zétényi3 — 1GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany — 2Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany — 3Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary
A calculation of angular dependencies of the cross section for the process π N → N e+ e− is presented. Three effective Lagrangians are used for the interaction vertex between a baryon resonance, a nucleon and a vector meson. The resulting angular dependencies are presented for different baryon spin states for the three interaction models. The goal of this investigation is twofold. First, to explore the possibility to identify the spin of a baryon resonance formed in the reaction, using the angular distributions. Second, to improve models for dilepton production in hadronic and nuclear collisions by confronting the results with the recent data of the HADES collaboration on this reaction.