ar X iv : h ep - p h / 95 06 24 5 v 1 6 J un 1 99 5 The triple pomeron interaction in the perturbative QCD

ar X iv : h ep - p h / 01 06 17 2 v 1 1 5 Ju n 20 01 Unified approach to hard diffraction

Using a combination of S-Matrix and perturbative QCD properties in the small x Bj regime, we propose a formulation of hard diffraction unifying the partonic (Ingelman-Schlein) Pomeron, Soft Colour Interaction and QCD dipole descriptions.

ar X iv : h ep - p h / 02 07 17 3 v 1 1 4 Ju l 2 00 2 On the Triple Pomeron Vertex in Perturbative QCD

We estimate the size of the triple Pomeron vertex in perturbative QCD and compare with the phenomenological value extracted from Regge fits to experimental data. For simplicity, the results of the QCD analysis are taken in the large-N c limit. We find that the perturbative triple Pomeron coupling is of the same order of magnitude as the observed one. We also estimate the size of the Pomeron sel...

ar X iv : h ep - p h / 96 06 30 7 v 1 1 2 Ju n 19 96 The pomeron - pomeron interaction in the perturbative QCD

The pomeron-pomeron interaction is studied in the perturbative approach of BFKL-Bartels. The total pomeron-pomeron cross-section is proportional to α 4 s s ∆ / √ t 1 t 2 where √ s is the c.m. energy and t 1,2 are the virtualities of the colliding pomerons. Upon calculating the coefficient the cross-section is found to be of the order 2.2 mb at √ s = 6 TeV and √ −t 1 ∼ √ −t 2 ∼ 1 GeV/c.

ar X iv : h ep - t h / 95 06 05 1 v 1 8 J un 1 99 5 June 1995 TAUP – 2253

We show that instantons violate a supersymmetric identity in a classically supersymmetric Higgs model with no massless fermions. This anomalous breaking arises because the correct perturbative expansion in the instanton sector is not supersymmetric. The attempt to construct a manifestly supersymmetric expansion generates infra-red divergences.

ar X iv : h ep - p h / 95 06 25 9 v 1 7 J un 1 99 5 CERN – TH / 95 – 83 hep - ph / 9506259 May 1995 MULTIPLE HARD