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Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Hadron Structure and Spectroscopy III

HK 19.1: Group Report

Tuesday, March 28, 2017, 14:00–14:30, F 5

Measurement of Electromagnetic Form Factors of Nucleons at the BESIII Experiment — •Dexu Lin1,2, Samer Ali Nasher Ahmed1,2, Alaa Dbeyssi1, Paul Larin1,2, Frank Maas1,2,3, Cristina Morales1, Christoph Rosner1,2, Yadi Wang1, and Bo Zheng1,4 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+epp 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+eppγ 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.

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