Conformal couplings and ``azimuthal matching'' of QCD Pomerons

Details Conformal couplings and ``azimuthal matching'' of QCD Pomerons Conformal couplings and ``azimuthal matching'' of QCD Pomerons

1999-05-18

arxiv.org/abs/hep-ph/9905378v1

Eur.Phys.J.C14:503-510,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 4 encapsulated figures, LaTeX

Scientific paper

10.1007/s100520000351

Using the asymptotic conformal invariance of perturbative QCD we derive the expression of the coupling of external states to all conformal spin-p components of the forward elastic amplitude. Using the wave-function formalism for structure functions at small x, we derive the perturbative coupling of the virtual photon for p= 1, which is maximal for linear transverse polarization. The non-perturbative coupling to the proton is discussed in terms of ``azimuthal matching'' between the proton color dipoles and the quark- antiquark configurations of the photon. As an application, the recent conjecture of a second QCD Pomeron related to the conformal spin-1 component is shown to rely upon a strong azimuthal matching of the p= 1 component in gamma* -proton scattering.

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