Speakers
Description
Electromagnetic form factors of baryons provide fundamental information about their structure and dynamics and provide rigorous tests of non-perturbative QCD as well as phenomenological models. However, results in the time-like region have large uncertainties. Production cross sections and form factors of hyperons have only barely been explored. Based on 500 pb^-1 of data collected with the BESIII detector between 2.0 GeV and 3.08 GeV, and data collected at the peak of the psi(3770) resonance and higher energies, we report measurements of the proton form factor in the time-like region using both the energy scan method and the initial state radiation technique. In addition, the line-shape of the Born cross sections of hyperon pairs for Lambda and Lambda_c baryons will be reported, where a non-zero cross section at threshold is observed. Observation of a non-zero relative phase angle between the Lambda hyperon's time-like G_E and G_M electromagnetic form factors is also reported.
