Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Hadron Structure and Spectroscopy VI

HK 46.4: Talk

Thursday, March 30, 2017, 18:00–18:15, F 5

Proton Time-Like Electromagnetic Form Factor Measurement with the Scan Method at BESIII — •Yadi Wang¹, Samer Ali Nasher Ahmed¹, Alaa Dbeyssi¹, Paul Larin¹, Dexu Lin¹, Frank Maas^{1, 2, 3}, Cristina Morales¹, Christoph Rosner¹, and Bo Zheng^{1, 4} for the BESIII collaboration — ¹Helmholtz-Institut Mainz, 55128 Mainz, Germany — ²Institute of Nuclear Physics, Mainz, Germany — ³PRISMA Cluster of Excellence, Mainz, Germany — ⁴University of South China, 421001 Hengyang China

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 pp as well as the individual electric and magnetic FF are presented.