Measurements of hadron form factors at BESIII

Abstract

BEPCII is a symmetric e+e−-collider located in Beijing running at center-of-mass energies between 2.0 and 4.6 GeV. This energy range allows the BESIII-experiment to measure hadron form factors both from direct e+e−-annihilation and from initial state radiation processes. In this paper, results on e+e− → pp¯ based on data collected by BESIII in 2011 and 2012 are presented. We also present preliminary results on e+e− → ΛΛ¯ based on the same data samples at 4 center-of-mass energies. BESIII results obtained from e+e− → π+π− using the initial state radiation technique at the center-of-mass energy of 3.773 GeV are also summarized. Finally, expectations on the measurement of baryon electromagnetic form factors from the BESIII high luminosity energy scan in 2015 and from initial state radiation processes at different center-of-mass energies are also explained.