Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 37: Hadron Structure and Spectroscopy VI
HK 37.3: Talk
Wednesday, February 28, 2018, 17:15–17:30, HZO 50
Proton Time-Like Electromagnetic Form Factor Measurement with the Scan Method at BESIII — •Christoph Rosner1, Samer Ahmed1, Alaa Dbeyssi1, Paul Larin1, Dexu Lin1, Frank Maas1,2,3, Cristina Morales1, and Yadi Wang1 for the BESIII collaboration — 1Helmholtz-Institut Mainz, Mainz, Germany — 2Institute of Nuclear Physics, Mainz, Germany — 3PRISMA Cluster of Excellence, Mainz, Germany
Electromagnetic form factors (FF) provide valuable insight to the internal structure and dynamics of the proton. While they are well known in the space-like region through electron scattering experiments, the time-like region, typically accessed by annihilation experiments, is known with much less precision. Specifically the separation of the electric and magnetic FF has only been possible with low accuracy due to the low luminosity of previous data.
This contribution reports on the analysis based on 651 pb−1 scan data taken at 22 energy points between 2.0 and 3.08 GeV with the Beijing Spectrometer III (BESIII) at the Beijing Electron Positron Collider II (BEPCII). The efforts to extract both the cross section of e+e−→ pp as well as the individual electric and magnetic FF are presented.