Abstract
The BESIII experiment, operated at the BEPCII e+e- collider in Beijing, has acquired large data sets at center-of-mass energies between 2.0 GeV and 4.6 GeV. One of the key aspects of the physics program of the BESIII collaboration is to test the understanding of QCD at intermediate energies. Applying different experimental techniques, form factors of hadrons are measured. Among these are the pion form factor, as an important input to the (g - 2)μ puzzle, and the electro-magnetic form factors of nucleons and hyperons in the time-like regime. An overview of the recent results and some ongoing studies at BESIII is provided.
Highlights
At the BESIII experiment in Beijing hadron electromagnetic form factors (EMFF) are studied to test and enhance the understanding of non-perturbative quantum chromodynamics (QCD), where hadrons and not quarks and gluons are the relevant degrees of freedom
The approach allows to systematically improve the accuracy of ahμVP,LO
The BESIII experiment can exploit the methods of the conventional energy scan as well as the tagged and untagged initial state radiation (ISR) techniques to provide valuable data, which allow to gain deeper insights
Summary
Their spatial extension has been studied e.g. in electron nucleon scattering since the 1960s, and it is still a topic of interest as manifested in the proton radius puzzle [1]. In addition to the size of hadrons, their internal structure is of interest. It is still not fully understood how the masses of hadrons are generated. The difference in mass is assumed to be generated due to the internal dynamics of the hadrons. Observables, which allow to parameterize the structure and the internal dynamics are electromagnetic form factors (EMFF). At the BESIII experiment in Beijing hadron EMFFs are studied to test and enhance the understanding of non-perturbative quantum chromodynamics (QCD), where hadrons and not quarks and gluons are the relevant degrees of freedom
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