Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Poster

HK 48.8: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

Towards Measuring the Electromagnetic Structure of η’ Mesons with the CLAS g12 Experiment — •Michaela Schever for the CLAS collaboration — RWTH Aachen — Forschungszentrum Jülich

The CLAS g12 experiment was performed with a tagged Bremsstrahlung photon beam using the 6 GeV electron beam from the CEBAF accelerator at Jefferson Lab, USA. We report on the Monte Carlo simulations being performed in order to support the CLAS approved analysis for light meson decays from existing data sets of the g12 experiment.

The specific goal of the effort described here is to look for events from the Dalitz decay η′→γ e⁺e⁻ and the possibility to deduce the electromagnetic transition form factor of the η′ meson. This would be achieved by comparing the measured dilepton invariant mass distribution with the QED calculation. It is expected that the resulting form factor dominantly displays the line shape of an intermediate vector meson, according to models based on vector meson dominance. So far, experimental results have suffered from a lack of statistics. Along with the actual data analysis, it is essential to model possible background contributions form competing decay channels as well as the contamination from external conversion processes.