### New Results on Diffractive t-Distributions from CDF.

Konstantin Goulianos
We present a measurement of antiproton ($\bar p$) four-momentum transfer distributions, $t_{\bar p}$, for inclusive and dijet single-diffractive production at $\sqrt s=$1.96 TeV at the Fermilab Tevatron $\bar pp$ Collider. We use data collected by the CDF~II detector equipped with a Roman Pot Spectrometer that measures $t_{\bar p}$ and the $\bar p$ forward momentum loss, $\xi_{\bar p}$. We report results for $0.05 < \xi_{\bar p} < 0.08$, $-t_{\bar p}\leq 4$~GeV$^2$, and jet transverse energies, \$E_T^{\rm...