Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 1: Hadron Structure and Spectroscopy I
HK 1.6: Vortrag
Montag, 26. Februar 2018, 15:30–15:45, HZO 50
Measurement of the e+ e− → pp cross section via initial state radiation at BESIII — •Alaa Dbeyssi1, Samer Ahmed1, Paul Larin1, Dexu Lin1, Frank Maas1,2,3, Cristina Morales1, Christoph Rosner1, Yadi Wang1, and Bo Zheng1 for the BESIII collaboration — 1Helmholtz-Institut Mainz, Mainz, Germany — 2Institute of Nuclear Physics, Mainz, Germany — 3PRISMA Cluster of Excellence, Mainz, Germany
This contribution reports on the recent measurements of the e+ e− → p p cross section using the initial state radiation technique with an undetected photon at the BESIII experiment in Beijing. The analysis is based on data sets, corresponding to an integrated luminosity of 7.408 fb−1, collected at center of mass energies between 3.773 and 4.600 GeV. Preliminary results on the measured proton form factors in the time-like region are presented. The proton magnetic form factor is determined in 30 intervals of the proton-antiproton invariant mass between 2.0 and 3.8 GeV/c2 under the assumption that the electric and the magnetic form factors are equal (|GE|=|GM|). The proton form factor ratio is also measured in the region between 2.0 and 3.0 GeV/c2.