  We study the Odderon contribution to elastic pp and ppbar scattering at high
energies. Different models for the Odderon-proton coupling are considered and
their effects on the differential cross section in the dip region are
investigated. We use a Regge fit by Donnachie and Landshoff as a framework and
replace its Odderon contribution by the different models. We consider two
models for the Odderon-proton impact factor proposed by Fukugita and Kwiecinski
and by Levin and Ryskin. In addition we construct a geometric model of the
proton which allows us to put limits on the size of a possible diquark cluster
in the proton. All models are able to describe the data well. The two models
for the impact factor require the strong coupling constant to be fixed rather
precisely. In the geometric model a relatively small diquark size is required
to describe the data.
