Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Poster
HK 48.5: Poster
Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer
Proton Time-like Electromagnetic Form Factor Measurements with the ISR Method at BESIII-experiment — •Dexu Lin1,2, Samer Ali Nasher Ahmed1,2, Alaa Dbeyssi1, Paul Larin1, Frank Maas1,2,3, Cristina Morales1, and Christoph Rosner1,2 — 1Helmholtz-Institut Mainz, 55128 Mainz, Germany — 2Institut für Kernphysik, Johannes Gutenberg Universität Mainz, 55099 Mainz, Germay — 3PRISMA Cluster of Excellence, Johannes Gutenberg Universität Mainz, 55099 Mainz, Germay
The structure of the proton can be understood through the study of its electromagnetic (EM) form factors. Electron scattering experiments have allowed to explore, with a high accuracy, the proton EM form factors in the space-like region. Due to the low luminosity achieved up to now, few data exist on the proton form factors in the time-like region and only a very coarse determination of the individual electric and magnetic form factors (or its ratio) has been possible so far.
BESIII (Beijing Spectrometer III) at BEPCII (Beijing Electron Positron Collider II) is collecting large data samples at J/Ψ, Ψ′′ and XYZ energy range. These data can be used to measure proton EM form factors using Initial-State-Radiation (ISR) events with the process e+e−→ p pγISR. In this poster, the status of proton EM form factors analysis in time-like regeion with the data from around 4 GeV center of mass energy will be summarized together with a discussion of the background substraction procedure.