Speaker
David Muller
(SLAC)
Description
Low-energy e+e- annihilation processes are accessible at BaBar
via intiai state radiation. The e+e- -> p anti-p cross section
have been measured using a data set of about 500 fb-1, on a
wide energy range from the production threshold up to 4 GeV.
The proton magnetic form factor, and the ratio of the electric
over the magnetic form factors have been extracted from
the measured cross section with unprecedented accuracy.
The steep rise of the form factor at an energy close to the
production threshold, as well as unexplained structures at
higher energies are confirmed.
Author
David Muller
(SLAC)
