Comment on "Four-body charge transfer processes in proton--helium   collisions"
  We found, within the plane-wave first Born approximation (PWFBA), that the proton-helium fully differential cross section (FDCS) for transfer excitation agrees well with the experimental one at the proton energy Ep = 300 keV and small scattering angles both in shape and in magnitude. This result is in a contradiction with that obtained in [1]. 
Salim Houamer and Yuri V. Popov
physics.atom-ph