The Forward Cone and L/T Separation in Diffractive DIS

LPS provides access to new fundamental observables: the diffraction cone and azimuthal asymmetries. Diffraction cone has a unique rise of $B_T$ from the exclusive limit to excitation of continuum $M^2 \approx Q^2$ which is in striking contrast to experience with real photoproduction and hadronic diffraction. Azimuthal asymmetry is large and pQCD calculable at large $\beta$ and can be measured with LPS. It allows testing of the pQCD prediction of $L/T >> 1$.