Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Hadron Structure and Spectroscopy III

HK 19.1: Gruppenbericht

Dienstag, 28. März 2017, 14:00–14:30, F 5

Measurement of Electromagnetic Form Factors of Nucleons at the BESIII Experiment — •Dexu Lin^1,2, Samer Ali Nasher Ahmed^1,2, Alaa Dbeyssi¹, Paul Larin^1,2, Frank Maas^1,2,3, Cristina Morales¹, Christoph Rosner^1,2, Yadi Wang¹, and Bo Zheng^1,4 for the BESIII collaboration — 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 — ⁴University of South China, 421001 Hengyang, China

BEPCII is a symmetric e⁺e⁻-collider located in Beijing running at √s energies between 2.0 and 4.6 GeV. This energy range allows the BESIII experiment to measure hadron form factors both from direct e⁺e⁻-annihilation and from initial-state-radiation processes. Results on e⁺e⁻→ pp based on data at √s energies between 2.22 to 3.67 GeV collected by BESIII in 2011 and 2012 are presented. We also report preliminary results on both tagged and untagged analyses with the initial-state-radiation process e⁺e⁻→ ppγ based on data samples at √s energies between 3.773 to 4.60 GeV. Finally, expectations on the measurement of nucleon electromagnetic form factors from the BESIII high luminosity energy scan in 2015 are also presented.