ar X iv : h ep - p h / 02 06 29 8 v 1 2 8 Ju n 20 02 Diffractive Vector Meson Production in k t - Factorization Approach ∗

x / 02 06 04 8 v 1 2 0 Ju n 20 02 Energy dependence of exclusive vector - meson production in ep interactions at HERA

On behalf on the ZEUS Collaboration The energy dependence of exclusive vector meson (V) production is studied using the ZEUS data. The SU(4) universality of V cross sections in the Q 2 + M 2 V scale is tested. The energy dependence of the ratio of the cross sections for V production to the total γ * p cross section is compared with expectations based on pQCD and Regge approaches.

ar X iv : h ep - p h / 02 06 17 1 v 2 2 4 Ju n 20 02 IPHE 2002 - 009 June 24 , 2002 B 0 – B 0 MIXING

ar X iv : h ep - e x / 98 06 02 0 v 1 1 9 Ju n 19 98 Scale Issues in High - Energy Diffractive Vector - Meson Production

Recent measurements of diffractive vector-meson production with the general-purpose detectors H1 and ZEUS in electron-proton interactions with 300 GeV center-of-mass energy at the HERA accelerator complex have stimulated great interest in the question of whether perturbative QCD (pQCD) can provide an accurate description of such diffractive processes. The high flux of quasi-real photons from th...

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 06 26 7 v 1 2 6 Ju n 20 02 Azimuthal asymmetries and Collins analyzing power ∗

Spin azimuthal asymmetries in pion electro-production in deep inelastic scattering off longitudinally polarized protons, measured by HERMES, are well reproduced theoretically with no adjustable parameters. Predictions for azimuthal asymmetries for a longitudinally polarized deuteron target are given. The z-dependence of the Collins fragmentation function is extracted. The first information on e...