ar X iv : h ep - p h / 98 11 46 2 v 1 2 4 N ov 1 99 8 The structure of the Troika : Proton , Photon and Pomeron , as seen at HERA ∗

ar X iv : h ep - p h / 98 11 43 9 v 1 2 3 N ov 1 99 8 Pomeron Flux Factor and Diffractive W and Jet Rates ∗

Experimental rates of W and dijets diffractively produced at the Tevatron Collider have recently become available. We use parametrizations of the pomeron structure function obtained from HERA data by two different schemes to compare theoretical expectations with the measured rates.

ar X iv : h ep - p h / 96 11 30 6 v 1 1 2 N ov 1 99 6 INTRODUCTION TO THE POMERON 1

ar X iv : h ep - p h / 97 11 35 5 v 1 1 7 N ov 1 99 7 Parton distributions in the photon from γ ∗ γ and γ ∗ p scattering

Parton distributions in the photon from γ * γ and γ * p scattering Abstract Leading order parton distributions in the photon are extracted from the existing F γ 2 measurements and the low-x proton structure function. The latter is related to the photon structure function by assuming Gribov factorization to hold at low x. The resulting parton distributions in the photon are found to be consisten...

ar X iv : h ep - p h / 99 11 42 6 v 1 2 1 N ov 1 99 9 Hadronic structure , low x physics and diffraction

A review is presented of numerous recent results, particularly those submitted to the EPSHEP99 conference: very high Q ep interactions and direct tests of the Standard Model, new measurements of the structure of the proton (including high x parton distributions and tests of QCD involving the gluon distribution), low x physics (tests of the BFKL evolution), diffraction in DIS at HERA, hard diffr...

ar X iv : h ep - e x / 98 11 02 3 v 1 1 1 N ov 1 99 8 The structure of the photon and its interactions ∗

The OPAL experiment at LEP has performed a variety of measurements of γγ and eγ scattering at the ee collider LEP to gain a deeper insight into the structure of the photon and its interactions. This review presents a summary of these results.