Decomposition of the QCD String into Dipoles and Unintegrated Gluon Distributions

Details Decomposition of the QCD String into Dipoles and Unintegrated Gluon Distributions Decomposition of the QCD String into Dipoles and Unintegrated Gluon Distributions

2002-07-23

arxiv.org/abs/hep-ph/0207287v1

Phys.Rev.D66:094019,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

43 pages, 14 figures

Scientific paper

10.1103/PhysRevD.66.094019

We present the perturbative and non-perturbative QCD structure of the dipole-dipole scattering amplitude in momentum space. The perturbative contribution is described by two-gluon exchange and the non-perturbative contribution by the stochastic vacuum model which leads to confinement of the quark and antiquark in the dipole via a string of color fields. This QCD string gives important non-perturbative contributions to high-energy reactions. A new structure different from the perturbative dipole factors is found in the string-string scattering amplitude. The string can be represented as an integral over stringless dipoles with a given dipole number density. This decomposition of the QCD string into dipoles allows us to calculate the unintegrated gluon distribution of hadrons and photons from the dipole-hadron and dipole-photon cross section via kT-factorization.

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