Nucleon form factors and final state radiative corrections to $e^+e^-\to \bar p p \gamma$

Understand

New parametrisation for the electric and the magnetic form factors of proton and neutron are presented.

• The proton form factors describe well the recent measurements by BaBar collaboration and earlier ones of the ratio of the form factors in space-like region.
• The neutron form factors are consistent with earlier measurements of neutron pair production and ratio of the form factors in the space-like region.
• These form factors are implemented into the generator PHOKHARA, which simulates the reactions $e^+e^-\to \bar p p \gamma$ and $e^+e^-\to \bar n n\gamma$.