Small momentum transfer elastic proton--proton cross-section at high energies is calculated assuming the nucleon composed of two constituents --- a quark and a diquark. A comparison to data (described very well up to -t \approx 2 GeV2/c) allows to determine some properties of the constituents. While quark turns out fairly small, the diquark appears to be rather large, comparable to the size of the proton.
PACS numbers: 13.85.Dz, 14.20.Dh, 12.39.--x
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