Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 55: Hadron Structure and Spectroscopy IX
HK 55.5: Talk
Friday, April 3, 2020, 12:15–12:30, J-HS A
Density Matrix and Dilepton Production in π N collision — •Deniz Nitt1, Miklós Zétényi2, and Michael Buballa1 — 1TU Darmstadt, Germany — 2WCRP Budapest, Hungary
The study of hadronic interactions with a dilepton in the final state reveals crucial information about the underlying reaction mechanisms, since the electromagnetic probes can escape the collision volume easily. We use an effective lagrangian model [1, 2] to study the elementary reaction π N → N e+ e− in the first and second nucleon resonance region at √s=1.49GeV and √s=1.7GeV respectively, which coincides with HADES experiments at GSI [3]. Even though the initial particles are unpolarised, the virtual photon shows a tensor polarisation which results in angular anisotropy for the dilepton. We calculate differential cross sections, angular anisotropy and give predictions for the spin density matrix of the hadronic channel. This work is supported by GSI - TU Darmstadt F&E, HGS-HIRe and COST THOR action CA15213.
[1] Enrico Speranza et al. Phys. Lett. B764 (2017) [2] Tom Vrancx et al. Phys. Rev. C84 (2011) [3] J. Adamczewski-Musch et al. Eur. Phys. J. A53.9 (2017)