Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Postersession
HK 45.44: Poster
Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24
Neutron Time-Like Electromagnetic Form Factor Measurement with Direct Scan Method at BESIII — •Paul Larin1,2, Samer Ali Nasher Ahmed1,2, Alaa Dbeyssi1, Dexu Lin1,2, Frank Maas1,2,3, Cristina Morales1, Christoph Rosner1,2, and Yadi Wang1,2 for the BESIII collaboration — 1Helmholtz-Institut Mainz, 55128 Mainz, Germany — 2Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — 3PRISMA Cluster of Excellence, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
The internal structure and dynamics of the neutron can be understood through the study of its electromagnetic (EM) form factors (FF). In comparison to proton FF measurements, less data on the neutron is available in the space-like as well as in the time-like region. None of the previous experiments were able to measure the ratio of the electric and the magnetic FF in the time-like region so far. The BESIII (Beijing Spectrometer III) experiment at BEPCII (Beijing Electron Positron Collider II) collected in 2014/15 a large sample of e+e− scan data in the region between 2.0 and 3.08 GeV with a total luminosity of 523.5 pb−1. With this poster we show our efforts to measure the effective FF of the neutron in a large energy region and the possibility to measure for the first time the ratio of the neutron form factors in the time-like region.