| Abstract
We present a measurement of the diffractive structure function
of the antiproton extracted from dijet events produced
in proton-antiproton collisions at 1800 GeV at the Fermilab Tevatron.
Diffractive events are identified by the presence of a leading antiproton
detected in a forward Roman Pot spectrometer.
The diffractive structure function is derived from the non-diffractive
and the ratio of the diffractive to non-diffractive cross sections.
Results are presented for antiproton fractional momentum loss
Xi in the region 0.035 < Xi < 0.095, 4-momentum transfer squared
|t|<1 GeV2, and jet transverse energy 7 < ET(jet) < 25 GeV.
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