Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-09-05
J.Phys.G28:915-926,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
Presented at the Ringberg Workshop on ``New Trends in HERA Physics 2001'', 17-22 June 2001; 14 pages, 12 figures
Scientific paper
10.1088/0954-3899/28/5/316
In a first part, I review our detailed investigation of the prospects to discover deep-inelastic processes induced by small QCD-instantons at HERA. This includes the essence of our calculations based on instanton-perturbation theory, crucial lattice constraints and a confrontation of the recent intriguing (preliminary) search results by the H1 collaboration with our predictions. In a second part, I report on two ongoing attempts towards a better understanding of the role of larger-size instantons in the QCD-vacuum and in high-energy (diffractive) scattering processes, respectively: The striking suppression of larger-size instantons in the vacuum is attributed to a residual conformal inversion symmetry, and a precocious lack of ``color transparency'' in the one-instanton contribution to the color-dipole scattering picture is emphasized.
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