Instantons and Saturation in the Colour Dipole Picture

Details Instantons and Saturation in the Colour Dipole Picture Instantons and Saturation in the Colour Dipole Picture

2002-07-03

arxiv.org/abs/hep-ph/0207052v2

Acta Phys.Polon. B33 (2002) 3633-3638

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 1 figure, presented at the Xth International Workshop on Deep Inelastic Scattering (DIS 2002), Cracow, 30 April - 4 M

Scientific paper

We pursue the intriguing possibility that larger-size instantons build up diffractive scattering, with the marked instanton-size scale $<\rho> \approx 0.5$ fm being reflected in the conspicuous ``geometrization'' of soft QCD. As an explicit illustration, the known instanton contribution to DIS is transformed into the intuitive colour dipole picture. With the help of lattice results, the $q \bar{q}$-dipole size r is carefully increased towards hadronic dimensions. Unlike pQCD, one now observes a competition between two crucial length scales: the dipole size r and the size $\rho$ of the background instanton that is sharply localized around $<\rho> \approx 0.5$ fm. For r exceeding $<\rho>$, the dipole cross section indeed saturates towards a geometrical limit, proportional to the area $\pi <\rho>^2$, subtended by the instanton.

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