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 73.3: Vortrag

Freitag, 27. März 2015, 15:30–15:45, T/HS2

First results of dilepton reconstruction in pion-induced reactions — •Federico Scozzi for the HADES collaboration — TU Darmstadt

Precise understanding of the elementary reactions is important for the interpretation of di-electron emission in heavy-ion collisions. The coupling of virtual photons to baryonic resonances can be experimentally probed by means of the πN → R → e⁺e⁻N process for which neither experimental data nor reliable theoretical predictions exist. In view of these, it is necessary that the exclusive cross section or dilepton production on the nucleon be measured. In summer 2014 the High Acceptance Di-Electron Spectrometer (HADES) experiment at GSI took data from pion-induced reactions using three targets: tungsten, carbon and polyethylene, at several pion beam momenta. A large part of the data, using a polyethylene target, was taken at a pion beam momentum of 0.69 GeV/c in order to explore the sub-threshold coupling of the ρ to baryonic resonances. Combining these data with carbon data it is possible to extract pion-proton interactions. In this contribution the first results for dilepton production in pion-induced reactions will be discussed.

This work has been supported by VH-NG-823, Helmholtz Alliance HA216/EMMI and GSI.