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Journal Article

Decomposition of the QCD string into dipoles and unintegrated gluon distributions


Pirner,  H. J.
Prof. Hans A. Weidenmüller, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Shoshi, A. I., Steffen, F. D., Dosch, H. G., & Pirner, H. J. (2002). Decomposition of the QCD string into dipoles and unintegrated gluon distributions. Physical Review D, 66(9): 094019, pp. 094019-094019.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-8276-8
We present the perturbative and non-perturbative QCD structure of the dipole-dipole scattering amplitude in momentum space. The perturbative contribution is described by the 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 nonperturbative 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 \(k) over right arrow (perpendicular to)\ factorization.