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Paper   IPM / Physic / 7211
School of Physics
  Title:   Relativistic Kinetic Vertex in Positronium
1.  S.M. Zebarjad
2.  M. Haghighat
  Status:   Preprint
  No.:  0
  Year:  2002
  Supported by:  IPM
We present Spinless Salpeter wave-function instead of Schrodinger wave-function in positronium to show that this make NRQED calculation easier. we also discuss that the singularity of the wave-function at the origin is necessary to cancel the ultraviolet divergence in NRQED calculations.

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