``Good-Walker'' + QCD dipoles = Hard Diffraction

Details ``Good-Walker'' + QCD dipoles = Hard Diffraction ``Good-Walker'' + QCD dipoles = Hard Diffraction

1998-05-14

arxiv.org/abs/hep-ph/9805325v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages latex + figure.eps; Invited talk at the DIS98 workshop, Brussels, April 1998

Scientific paper

The Good-Walker mechanism for diffraction is shown to provide a link between total and diffractive structure functions and to be relevant for QCD calculations at small x_{Bj}. For Deep-Inelastic scattering on a small-size target (cf. an onium) the r\^ ole of Good-Walker ``diffractive eigenstates'' is played by the QCD dipoles appearing in the $1/N_C$ limit of QCD. Hard diffraction is thus related to the QCD tripe-dipole vertex which has been recently identified (and calculated) as being a conformal invariant correlator and/or a closed-string amplitude. An extension to hard diffraction at HERA via $k_T-$factorisation of the proton vertices leads to interesting phenomenology.

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