ar X iv : h ep - p h / 02 10 10 1 v 1 7 O ct 2 00 2 Hard diffraction and the nature of the Pomeron

ar X iv : h ep - p h / 02 10 08 7 v 1 4 O ct 2 00 2 A new hard QCD phenomenon - proton diffraction into three jets

We argue that the process of the proton diffraction into three jets in proton-nucleus scattering at LHC will allow to investigate the light-cone wave function of protons, generalized gluon densities in nuclei at small x, as well as the interplay of the color transparency and opacity phenomena.

ar X iv : h ep - p h / 01 10 02 5 v 1 1 O ct 2 00 1 Hard and Soft Contributions in Diffraction ⋆

We report our calculations on the logarithmic slope of the diffractive structure function F D 2 considering distinct approaches coming from both the pQCD and the Regge descriptions of diffractive DIS. Such a quantity is a potential observable to discriminate between pQCD and Regge domains and allows to disentangle the underlying dynamics.

ar X iv : h ep - p h / 02 06 27 0 v 1 2 6 Ju n 20 02 1 The charge asymmetry from Pomeron - Odderon interference in hard

ar X iv : h ep - p h / 02 10 22 9 v 1 1 6 O ct 2 00 2 SPIN AND HARD PROCESSES

It is argued that spin is a fundamental aspect of gauge theories at short distances. As a consequence there are characteristic helicity asymmtries in hard inclusive and exclusive reactions of which a few are discussed.

ar X iv : h ep - p h / 98 06 38 4 v 1 1 6 Ju n 19 98 Diffraction : Results and Conclusions 1

We summarize the main features of available experimental results on soft and hard diffraction and draw conclusions about the nature of the pomeron.