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Small-x Physics: Interface between perturbative and non-perturbative QCD dynamics.

Ziel

The aim of the project is an investigation in a framework of the Quantum Chromodynamics of phenomena in a transitional region between "hard" and "soft" processes. Special theoretical methods will be developed for this purpose. These methods will be verified in high-energy interactions induced by leptons and hadrons. Special attention will be to the small-x region.

The OCD perturbation theory will be extensively used for a study of a broad class of phenomena in hard processes. A region of applicability of this theory and a role of nonperturbative effects will be studied, using the topological expansion, method of vacuum correlators and strings model. In the small-x region the effective Regge theory will be applied. The collaboration involves scientific groups, which proposed and developed the abovementioned approaches.

The new aspects of this project are:

a) Investigation of the perturbative (BFKL) dynamics in the small-x region, including NLO results for both trajectory of the Pomeron and impact factors. Developments of new methods of analysis of perturbative diagrams in OCD and its supersymmetric extensions;
b) A unified approach to both structure functions and diffractive production, which include both single Pomeron exchange and unitarization effects;
c) A study of an interplay between perturbative and nonperturbative dynamics for spin-dependent structure functions;
d) Analysis of amplitudes with quark exchanges in the multi-Regge kinematics and predictions for spectra and wave functions of qq states.

The research activities will proceed in the following general directions:

- perturbative effects in the small-x physics;
- phenomenological analysis of small-x deep inelastic scattering and other diffractive processes;
- spin effects and polarized structure functions;
- mesonic Regge-trajectories in QCD;
- glueballs and nonperturbative effect for the Pomeron.

The main results of the project are expected to be:

- new theoretical methods of analysis of processes in the transitional region between "soft" and "hard" processes;
- application of these methods to analysis of structure functions of hadrons and diffractive processes;
- understanding of a role of noperturbative effects for high energy interactions of leptons and hadrons;
- formulation of predictions for future super colliders.

The aim of the project is an investigation in a framework of the Quantum Chromodynamics of phenomena in a transitional region between "hard" and "soft" processes. Special theoretical methods will be developed for this purpose. These methods will be verified in high-energy interactions induced by leptons and hadrons. Special attention will be to the small-x region.

The OCD perturbation theory will be extensively used for a study of a broad class of phenomena in hard processes. A region of applicability of this theory and a role of nonperturbative effects will be studied, using the topological expansion, method of vacuum correlators and strings model. In the small-x region the effective Regge theory will be applied. The collaboration involves scientific groups, which proposed and developed the abovementioned approaches.

The new aspects of this project are:

a) Investigation of the perturbative (BFKL) dynamics in the small-x region, including NLO results for both trajectory of the Pomeron and impact factors. Developments of new methods of analysis of perturbative diagrams in OCD and its supersymmetric extensions;
b) A unified approach to both structure functions and diffractive production, which include both single Pomeron exchange and unitarization effects;
c) A study of an interplay between perturbative and nonperturbative dynamics for spin-dependent structure functions;
d) Analysis of amplitudes with quark exchanges in the multi-Regge kinematics and predictions for spectra and wave functions of qq states.

The research activities will proceed in the following general directions:

- perturbative effects in the small-x physics;
- phenomenological analysis of small-x deep inelastic scattering and other diffractive processes;
- spin effects and polarized structure functions;
- mesonic Regge-trajectories in QCD;
- glueballs and nonperturbative effect for the Pomeron.

The main results of the project are expected to be:

- new theoretical methods of analysis of processes in the transitional region between "soft" and "hard" processes;
- application of these methods to analysis of structure functions of hadrons and diffractive processes;
- understanding of a role of noperturbative effects for high energy interactions of leptons and hadrons;
- formulation of predictions for future super colliders.

Wissenschaftliches Gebiet (EuroSciVoc)

CORDIS klassifiziert Projekte mit EuroSciVoc, einer mehrsprachigen Taxonomie der Wissenschaftsbereiche, durch einen halbautomatischen Prozess, der auf Verfahren der Verarbeitung natürlicher Sprache beruht. Siehe: Das European Science Vocabulary.

Dieses Projekt wurde noch nicht bei EuroSciVoc klassifiziert.
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Koordinator

Dipartimento di Fisica, Universita` Milano-Bicocca, Italy
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Piazza della Scienza 3
20126 Milano
Italien

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Beteiligte (7)

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