We discuss some phenomenological applications of an infrared finite gluon propagator characterized by a dynamically generated gluon mass. In particular we compute the effect of the dynamical gluon mass on pp and p̄p diffractive scattering. We also show how the data on γp photoproduction and hadronic γγ reactions can be derived from the pp and p̄p forward scattering amplitudes by assuming vector m...

We compute the dimension-2 gluon pair condensate g2〈AA〉 and the dimension-4 mixed quark-gluon condensate 〈qgA · γq〉 in Landau gauge within the framework of global color model. The result for the dynamical gluon mass is within the range given by other independent determinations. The obtained mixed Landau gauge condensate 〈qgA ·γq〉 is clearly dependent on the definitions of the condensates. We sh...

Present data do not rule out the light neutral Higgs particle h or A with mass below 40–50 GeV in the framework of the general 2HDM (" Model II "). The status of this model in a light of existing LEP I data and a potential of the new muon experiment (g-2), the measurement of photon-gluon and gluon-gluon fusion at HERA as well as photon-photon fusion at low energy γγ NLC is discussed.

The hadroproduction of lepton pairs with mass Q and finite transverse momentum QT is described in perturbative QCD by the same partonic subprocesses as prompt photon production. We demonstrate that, like prompt photon production, lepton pair production is dominated by quark-gluon scattering in the region QT > Q/2. This feature leads to sensitivity to the gluon density in kinematical regimes acc...

This talk reviews some recent results on the NLL resummed smallx gluon splitting function, as determined including renormalisation-group improvements. It also discusses the observation that the LO, NLO, NNLO, etc. hierarchy for the gluon splitting function breaks down not when αs ln 1/x ∼ 1 but rather for αs ln 2 1/x ∼ 1. It is well-known that the resummation of leading-logarithms of x (LLx) [1...

This talk outlines the derivation of a high-energy, transverse momentum cutoff , solution of QCD in which the Regge pole and " single gluon " properties of the pomeron are directly related to the confinement and chiral symmetry breaking properties of the hadron spectrum. In first approximation, the pomeron is a single reggeized gluon plus a " wee parton " component that compensates for the colo...

In this talk the pomeron conjecture is reviewed and constituent gluon models are derived. In a simple two-gluon glueball spectrum the pomeron trajectory and the daughter trajectories are computed. The open problems of two-gluon glueballs are discussed, including transversality and Yang’s theorem, the spin tensor interactions, the structure of the string and decays. The related systems of charme...

The 3d gluodynamics which governs the large T quark gluon plasma is studied in the framework of the field correlator method. Field cor-relators and spacial string tension are derived through the gluelump Green's functions. The glueball spectrum is calculated both in C = −1 as well as in C = +1 sectors, and multigluon bound states in the form of " gluon rings " and " gluon stars " are computed e...

As an alternative method to lattice and perturbative QCD we suggest to include the gluon condensate into the parton propagators [1]. In this way non-perturbative effects are taken into account within the Green functions technique. In the case of a pure gluon gas with energy density ǫ and pressure p the gluon condensate can be related to the interaction measure ∆ = (ǫ− 3p)/T 4 via [2] 〈G〉T = 〈G〉...

We discuss the impact of including corrections beyond single gluon exchange in light mesons within the nonperturbative framework of DysonSchwinger equations (DSE) and Bethe-Salpeter equations (BSE). We do this by considering unquenching effects in the form of hadronic resonance contributions, notably pion exchange, and by the inclusion of the dominant gluon self-interactions to the quark-gluon ...